CBMemoryDrive Component

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The CBMemoryDrive component lets applications create an in-memory vault, accessible to all or some processes as a regular disk.

Syntax

TcbsCBMemoryDrive

Remarks

The CBMemoryDrive component allows applications to create an in-memory vault and interact with its contents directly. A vault can contain any number of files, directories, alternate streams, and symbolic links; so long as it has sufficient capacity to store them. For more information about using CBFS Storage's many features, please refer to the extensive General Information topics.

No data is ever stored on disk, all data is stored in memory.

Getting Started

Each CBMemoryDrive component instance can control a single vault at once. Applications can use multiple instances of the CBMemoryDrive component if their use-case requires multiple vaults.

Here's how to get up and running:

1. Create or open a vault by calling the CreateVault method.
2. Interact with the vault, and its contents, using the CBMemoryDrive component's API methods.
3. When done, call the CloseVault method to close the vault.

Property List

The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the component with short descriptions. Click on the links for further details.

AccessDeniedProcesses Property (CBMemoryDrive Component)

Collection of access rules that define which processes may not access the virtual drive.

Syntax

property AccessDeniedProcesses: TcbsProcessAccessRuleList read get_AccessDeniedProcesses;

Remarks

This property holds a collection of ProcessAccessRule objects representing rules that deny processes certain kinds of access to the virtual drive.

Please refer to the AddDeniedProcess and RemoveDeniedProcess methods for more information.

Note: The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

This property is read-only and not available at design time.

AccessGrantedProcesses Property (CBMemoryDrive Component)

Collection of access rules that define which processes may access the virtual drive.

Syntax

property AccessGrantedProcesses: TcbsProcessAccessRuleList read get_AccessGrantedProcesses;

Remarks

This property holds a collection of ProcessAccessRule objects representing rules that grant processes certain kinds of access to the virtual drive.

Please refer to the AddGrantedProcess and RemoveGrantedProcess methods for more information.

Note: The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

This property is read-only and not available at design time.

Active Property (CBMemoryDrive Component)

Whether a vault has been opened and mounted as a virtual drive.

Syntax

property Active: Boolean read get_Active;

Default Value

false

Remarks

This property reflects whether the component has opened a vault and mounted a virtual drive for it; it will be True once the CreateVault LoadFromFile method has been called successfully.

This property is read-only and not available at design time.

AutoCompactAt Property (CBMemoryDrive Component)

This property specifies the free space percentage threshold a vault must reach to be eligible for automatic compaction.

Syntax

property AutoCompactAt: Integer read get_AutoCompactAt write set_AutoCompactAt;

Default Value

25

Remarks

This property specifies the percentage of free space a vault must have, at minimum, for it to be eligible for automatic vault compaction. An eligible vault may be compacted automatically in the background at any time. Please refer to the CompactVault method for more information about the compacting process.

To guard against excessive automatic compaction operations, applications can set the AutoCompactDelay configuration setting to a nonzero value. Alternatively, this property can be set to 0 to disable automatic compaction completely.

A vault opened in ReadOnly mode will never be compacted, regardless of this property's value.

Note: This property cannot be changed within events.

CaseSensitive Property (CBMemoryDrive Component)

This property specifies whether the component should open a vault in case-sensitive mode.

Syntax

property CaseSensitive: Boolean read get_CaseSensitive write set_CaseSensitive;

Default Value

false

Remarks

This property specifies whether the component should open a vault in case-sensitive mode. Enabling this property causes all file, directory, symbolic link, alternate stream, and file tag names to be treated as case sensitive.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

DefaultFileAccessPassword Property (CBMemoryDrive Component)

This property specifies the default encryption password to use when opening files and alternate streams.

Syntax

property DefaultFileAccessPassword: String read get_DefaultFileAccessPassword write set_DefaultFileAccessPassword;

Default Value

''

Remarks

This property specifies the default encryption password that the component should use when opening files and alternate streams.

Please refer to the Encryption topic for more information.

As an alternative to using this property, applications may call the CacheFilePassword method (before a file is opened) to specify a one-time-use password or may specify file encryption passwords dynamically using the FilePasswordNeeded event.

DefaultFileCompression Property (CBMemoryDrive Component)

This property specifies the default compression mode to use when creating files and alternate streams.

Syntax

property DefaultFileCompression: Integer read get_DefaultFileCompression write set_DefaultFileCompression;

Default Value

0

Remarks

This property specifies the default compression mode that the component should use when creating files and alternate streams. Valid values are as follows:

Applications that use custom compression must implement the DataCompress and DataDecompress events. Please refer to the Compression topic for more information.

Applications can also specify a default compression level using the DefaultFileCompressionLevel configuration setting, if desired.

DefaultFileCreatePassword Property (CBMemoryDrive Component)

This property specifies the default encryption password to use when creating new files and alternate streams.

Syntax

property DefaultFileCreatePassword: String read get_DefaultFileCreatePassword write set_DefaultFileCreatePassword;

Default Value

''

Remarks

This property specifies the default encryption password that the component should use when creating new files and alternate streams.

Please refer to the Encryption topic for more information.

DefaultFileEncryption Property (CBMemoryDrive Component)

This property specifies the default encryption mode to use when creating files and alternate streams.

Syntax

property DefaultFileEncryption: Integer read get_DefaultFileEncryption write set_DefaultFileEncryption;

Default Value

0

Remarks

This property specifies the default encryption mode that the component should use when creating files and alternate streams. Valid values are as follows:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

Applications that set this property to a value other than VAULT_EM_NONE (the default) should also specify a default encryption password using the DefaultFileCreatePassword property.

FileSystemName Property (CBMemoryDrive Component)

The name of the virtual filesystem.

Syntax

property FileSystemName: String read get_FileSystemName write set_FileSystemName;

Default Value

'FAT32'

Remarks

This property specifies the name of the virtual filesystem. Windows, and some other applications, use this name to identify the filesystem.

In general, the filesystem name can be any reasonable string up to 10 characters in length. However, some versions of Windows and some third-party programs may behave differently when they encounter an unknown filesystem name (i.e., anything other than FAT, FAT32, exFAT, NTFS, etc.). Applications should keep this restriction in mind when choosing a filesystem name.

This property is set to FAT32 by default, which may cause some applications to fail when attempting to copy large (>4GB) files to and from the virtual drive. It is recommended that applications set this property to exFAT if such issues occur.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

IsCorrupted Property (CBMemoryDrive Component)

This property specifies whether the vault is corrupted.

Syntax

property IsCorrupted: Boolean read get_IsCorrupted;

Default Value

false

Remarks

This property reflects whether the currently open vault is corrupted, as indicated by the presence of the VAULT_ST_CORRUPTED flag in the VaultState property.

The VAULT_ST_CORRUPTED flag is set automatically anytime the component detects that a vault's integrity has been compromised. Calling the CheckAndRepair method for a corrupted vault will clear the flag.

This property is read-only and not available at design time.

LastWriteTime Property (CBMemoryDrive Component)

This property specifies the last modification time of the vault.

Syntax

property LastWriteTime: TDateTime read get_LastWriteTime;

Default Value

0

Remarks

This property reflects the vault's last modification time, specified in UTC.

This property is read-only and not available at design time.

Logo Property (CBMemoryDrive Component)

This property specifies an application-defined text-based logo stored in the second page of a vault.

Syntax

property Logo: String read get_Logo write set_Logo;

Default Value

'CBFS Vault'

Remarks

This property is used to control a vault's logo, which is a UTF-16LE string stored in the second page of a vault. A vault's logo is visible to anyone who inspects its raw data and thus can be used to provide information about the vault itself.

Vault logos can be up to 127 characters long (not including the null terminator).

Note: This property cannot be changed within events.

MountingPoints Property (CBMemoryDrive Component)

Collection of mounting points for the virtual drive.

Syntax

property MountingPoints: TcbsMountingPointList read get_MountingPoints;

Remarks

This property holds a collection of MountingPoint objects, each of which represents an available mounting point for the virtual drive.

Please refer to the AddMountingPoint and RemoveMountingPoint methods for more information.

Note: The methods and properties related to mounting points are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of mounting points occurs in a thread-safe manner.

This property is read-only and not available at design time.

OpenFiles Property (CBMemoryDrive Component)

Collection of information about the objects in the virtual drive that are currently open.

Syntax

property OpenFiles: TcbsOpenFileList read get_OpenFiles;

Remarks

This property holds a collection of OpenFile objects representing filesystem objects (files, directories, etc.) from the virtual drive that are currently open. The collection is populated anytime CreateOpenedFilesSnapshot is called, and cleared when CloseOpenedFilesSnapshot is called; please refer to those methods for more information.

Note: The methods and properties related to open files snapshots are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that creation, use, and cleanup of open files snapshots occurs in a thread-safe manner.

This property is read-only and not available at design time.

PageSize Property (CBMemoryDrive Component)

This property specifies the vault's page size.

Syntax

property PageSize: Integer read get_PageSize write set_PageSize;

Default Value

4096

Remarks

This property controls the page size used when creating new vaults and reflects the page size of the currently open vault. Valid values are 256 through 65536 bytes (inclusive).

A vault's page size is permanent, it cannot be changed after the vault is created. Please refer to the Vaults topic for more information.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

PathSeparator Property (CBMemoryDrive Component)

This property specifies the path separator character to use when returning vault paths.

Syntax

property PathSeparator: Integer read get_PathSeparator write set_PathSeparator;

Default Value

92

Remarks

This property specifies the path separator character that the component APIs should use when returning a vault path. Valid values are as follows:

Note: This property is just a convenience; applications are free to use either of the above characters as path separators when passing path strings to the component's APIs.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

PossibleFreeSpace Property (CBMemoryDrive Component)

This property specifies the maximum amount of free space the vault could possibly have available.

Syntax

property PossibleFreeSpace: Int64 read get_PossibleFreeSpace;

Default Value

0

Remarks

This property reflects the maximum amount of free space, in bytes, that the vault could possibly have available. That is, it is the amount of free space that would be available if the vault automatically grew to its maximum PossibleSize right now, without any additional data being written to it. Therefore:

• If VaultSizeMax is 0 (unlimited): this property is equivalent to VaultFreeSpace + parent_free_space.
• If VaultSizeMax is not 0: this property is equivalent to VaultFreeSpace + min(parent_free_space, (VaultSizeMax - VaultSize)).

In both cases, parent_free_space is the amount of free space available for the vault to use for automatic growth. For a file-based vault, this is the total amount of free space on the disk where the vault's storage file (i.e., VaultFile) resides, as reported by the OS. For a Callback Mode vault, this is whatever value the application provides through the VaultGetParentSize event.

Please refer to the Vault Size topic for more information.

This property is read-only and not available at design time.

PossibleSize Property (CBMemoryDrive Component)

This property specifies the maximum size the vault could possibly be.

Syntax

property PossibleSize: Int64 read get_PossibleSize;

Default Value

0

Remarks

This property reflects the maximum size, in bytes, that the vault could possibly be. That is, it is the size that the vault would be if it automatically grew as much as possible right now, without any additional data being written to it. Therefore:

• If VaultSizeMax is 0 (unlimited): this property is equivalent to VaultFreeSpace + parent_free_space.
• If VaultSizeMax is not 0: this property matches VaultSizeMax.

In the former case, parent_free_space is the amount of free space available for the vault to use for automatic growth. For a file-based vault, this is the total amount of free space on the disk where the vault's storage file (i.e., VaultFile) resides, as reported by the OS. For a Callback Mode vault, this is whatever value the application provides through the VaultGetParentSize event.

Please refer to the VaultSize topic for more information.

This property is read-only and not available at design time.

ProcessRestrictionsEnabled Property (CBMemoryDrive Component)

Whether process access restrictions are enabled.

Syntax

property ProcessRestrictionsEnabled: Boolean read get_ProcessRestrictionsEnabled write set_ProcessRestrictionsEnabled;

Default Value

false

Remarks

This property controls whether the component should enforce per-process access restrictions; by default, it is disabled. When enabled, the AddGrantedProcess and AddDeniedProcess methods can be used to add process-specific access rules for the component to enforce across the entire virtual drive.

When an application enables this propery, it should use the AddGrantedProcess method to add at least one pocess as allowed; otherwise, the data will be inaccessible.

The current process access rules are reflected by the AccessGrantedProcess* and AccessDeniedProcess* properties.

Note: The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

ReadOnly Property (CBMemoryDrive Component)

This property specifies whether the component should open a vault in read-only mode.

Syntax

property ReadOnly: Boolean read get_ReadOnly write set_ReadOnly;

Default Value

false

Remarks

This property specifies whether the component should open a vault in read-only mode. When a vault is opened in read-only mode, the following restrictions apply:

• No new vault items (e.g., files, directories, symbolic links, and alternate streams) may be created.
• No existing vault items may be modified, renamed, moved, or deleted. This includes updating access times.
• The vault cannot be resized or compacted (automatically or explicitly).
• Vault corruption cannot be repaired using CheckAndRepair.

Note: This list may not necessarily be exhaustive.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

ReportPossibleSize Property (CBMemoryDrive Component)

How the component should report the virtual drive's size and free space to the OS.

Syntax

property ReportPossibleSize: Boolean read get_ReportPossibleSize write set_ReportPossibleSize;

Default Value

true

Remarks

This property controls which pair of values the component should use when reporting the virtual drive's size and free space to the OS.

When this property is enabled (default), the component will use the values of the PossibleSize and PossibleFreeSpace properties. When this property is disabled, the component will use the values of the VaultSize and PossibleSize properties.

To ensure correct operation, it is recommended that applications keep this property enabled, unless a vault's size has been fixed by setting the VaultSizeMin and VaultSizeMax properties equal to each other.

Please refer to the documentation of the properties mentioned above, as well as the Vault Size topic, for more information.

Note: This property cannot be changed within events.

StorageCharacteristics Property (CBMemoryDrive Component)

The characteristic flags to create the virtual drive with (Windows only).

Syntax

property StorageCharacteristics: Integer read get_StorageCharacteristics write set_StorageCharacteristics;

Default Value

16

Remarks

The system, as well as other applications, use these flags to optimize their use of the virtual drive. This property should be set by OR'ing together zero or more of the following flags:

Note: This property cannot be changed after a virtual drive is created, and it cannot be changed within events.

StorageGUID Property (CBMemoryDrive Component)

The GUID to create the virtual drive with.

Syntax

property StorageGUID: String read get_StorageGUID write set_StorageGUID;

Default Value

''

Remarks

When the StorageType property is set to STGT_DISK_PNP, this property is used to specify a GUID for the virtual drive, and must be set to GUID-formatted string (e.g., {676D0357-A23A-49c3-B433-65AAD72DD282}). Otherwise, this property may be left empty; in the latter case, the driver will generate a unique value when a drive is mounted.

Some software uses a drive's GUID for the purpose of setting and maintaining certain configuration parameters. Therefore, applications are expected to use the same GUID when repeatedly creating a virtual drive that represents the same data.

Note: This property cannot be changed after a virtual drive is created, and it cannot be changed within events.

StorageType Property (CBMemoryDrive Component)

The type of virtual drive to create (Windows only).

Syntax

property StorageType: Integer read get_StorageType write set_StorageType;

Default Value

0

Remarks

This property specifies what type of virtual drive should be created. Windows Explorer uses this information to display the appropriate icon and apply the appropriate security settings for the virtual drive. Other applications may also make use of this information in various ways.

Possible values are:

Note: This property cannot be changed after a virtual drive is created, and it cannot be changed within events.

Plug-and-play Virtual Drives

Virtual drives created as plug-and-play (STGT_DISK_PNP) require that a "physical device" be visible in the Disk Manager snap-in of the Microsoft Management Console (mmc.exe). This can be accomplished by calling the AddMountingPoint method and including the STGMP_MOUNT_MANAGER flag in the value passed for its Flags parameter.

In addition to supporting the STGC_REMOVABLE_MEDIA StorageCharacteristics flag, which specifies whether a virtual drive's media is removable or non-removable, plug-and-play virtual drives also support the STGC_ALLOW_EJECTION flag, which specifies whether a virtual drive itself is removable or non-removable.

Tag Property (CBMemoryDrive Component)

This property stores application-defined data specific to a particular instance of the component.

Syntax

property Tag: Int64 read get_Tag write set_Tag;

Default Value

0

Remarks

This property can be used to store data specific to a particular instance of the component.

Timeout Property (CBMemoryDrive Component)

How long vault events may execute before timing out.

Syntax

property Timeout: Integer read get_Timeout write set_Timeout;

Default Value

0

Remarks

This property specifies how long the events may execute before timing out.

When this property is set to a non-zero value, and an event executes long enough for its timeout to expire, the driver cancels the underlying request by reporting an error to the OS. The tardy event still runs to completion, but any results it returns once finished are ignored since the underlying request has already been handled.

Setting this property to 0 disables event timeouts, which allows events to take as long as necessary to execute.

Note: This property cannot be changed within events.

UseAccessTime Property (CBMemoryDrive Component)

This property specifies whether the component should keep track of last access times for vault items.

Syntax

property UseAccessTime: Boolean read get_UseAccessTime write set_UseAccessTime;

Default Value

false

Remarks

This property specifies whether the component should update the last access time for vault items (e.g., files, directories, symbolic links, and alternate streams) every time they are accessed.

Note: Keeping track of access times will slow down operations.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

VaultEncryption Property (CBMemoryDrive Component)

This property specifies the whole-vault encryption mode.

Syntax

property VaultEncryption: Integer read get_VaultEncryption write set_VaultEncryption;

Default Value

0

Remarks

This property controls the whole-vault encryption mode used when creating new vaults and reflects the whole-vault encryption mode of the currently open vault. Valid values are as follows:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

To create a new vault with whole-vault encryption enabled, the VaultPassword property must be set as well.

When an existing vault is opened, the component updates VaultEncryption automatically based on the detected whole-vault encryption mode. If the vault is encrypted, the component will attempt to access it using the password specified by VaultPassword. If VaultPassword is incorrect, the attempt will fail and the vault will not be opened.

The VaultEncryption and VaultPassword properties cannot be used to change an open vault's whole-vault encryption mode or password; use the UpdateVaultEncryption method.

Please refer to the Encryption topic for more information.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

VaultFreeSpace Property (CBMemoryDrive Component)

This property reflects the actual amount of free space the vault has available.

Syntax

property VaultFreeSpace: Int64 read get_VaultFreeSpace;

Default Value

0

Remarks

This property reflects the actual amount of free space, in bytes, that the vault currently has available. A vault's actual free space is based on its actual size, which is reflected by the VaultSize property.

Applications can also determine the maximum amount of free space the vault could possibly have by querying the PossibleFreeSpace property; please refer to its documentation, as well as the Vault Size topic, for more information.

This property is read-only and not available at design time.

VaultPassword Property (CBMemoryDrive Component)

This property specifies the whole-vault encryption password.

Syntax

property VaultPassword: String read get_VaultPassword write set_VaultPassword;

Default Value

''

Remarks

This property specifies the whole-vault encryption password to use when creating new vaults and opening existing vaults.

To create a new vault with whole-vault encryption enabled, the VaultEncryption property must be set as well.

When an existing vault is opened, the component updates VaultEncryption automatically based on the detected whole-vault encryption mode. If the vault is encrypted, the component will attempt to access it using the password specified by VaultPassword. If VaultPassword is incorrect, the attempt will fail and the vault will not be opened.

The VaultEncryption and VaultPassword properties cannot be used to change an open vault's whole-vault encryption mode or password; use the UpdateVaultEncryption method.

Please refer to the Encryption topic for more information.

Note: This property cannot be changed when Active is True, and it cannot be changed within events.

VaultSize Property (CBMemoryDrive Component)

This property specifies the actual size of the vault.

Syntax

property VaultSize: Int64 read get_VaultSize write set_VaultSize;

Default Value

0

Remarks

This property specifies the actual size of the vault, in bytes.

Applications may use this property to explicitly resize a vault, keeping in mind the following:

• A vault cannot shrink more than its available free space allows (i.e., not by more than VaultFreeSpace bytes).
• A vault cannot shrink beyond VaultSizeMin bytes.
• If VaultSizeMax is not 0 (unlimited), a vault cannot grow beyond VaultSizeMax bytes.
• If a vault grows enough to reach or exceed its AutoCompactAt threshold, it will automatically shrink again when the next automatic compaction occurs.

Applications can determine the maximum size a vault could possibly be by querying the PossibleSize property. Please refer to the Vault Size topic for more information.

Note: This property can be changed only when Active is True, and it cannot be changed within events.

This property is not available at design time.

VaultSizeMax Property (CBMemoryDrive Component)

This property specifies the maximum size a vault can be.

Syntax

property VaultSizeMax: Int64 read get_VaultSizeMax write set_VaultSizeMax;

Default Value

0

Remarks

This property specifies the maximum size, in bytes, that a vault can be. This property must be set to 0 (unlimited), or a number greater than or equal to 8 * PageSize or VaultSizeMin (whichever is greater).

The limit imposed by this property, if any, applies to both explicit growth of a vault via the VaultSize property, and implicit growth of a vault due to storage load. Please refer to the Vault Size topic for more information.

Note: This property cannot be changed within events.

VaultSizeMin Property (CBMemoryDrive Component)

This property specifies the minimum size a vault can be.

Syntax

property VaultSizeMin: Int64 read get_VaultSizeMin write set_VaultSizeMin;

Default Value

0

Remarks

This property specifies the minimum size, in bytes, that a vault can be. This property's value must be less than or equal to VaultSizeMax, unless VaultSizeMax is set to 0 (unlimited).

The limit imposed by this property applies to both explicit shrinking of a vault via the VaultSize property or the CompactVault method, and implicit shrinking of a vault via automatic compaction. Please refer to the Vault Size topic for more information.

Note: This property cannot be changed within events.

VaultState Property (CBMemoryDrive Component)

This property specifies information about the state of the vault.

Syntax

property VaultState: Integer read get_VaultState;

Default Value

0

Remarks

This property reflects the current state of the vault; its value consists of one or more of the following flags, ORed together:

This property is read-only and not available at design time.

AddDeniedProcess Method (CBMemoryDrive Component)

Adds a rule that prevents a process from accessing the virtual drive.

Syntax

procedure AddDeniedProcess(ProcessFileName: String; ProcessId: Integer; ChildProcesses: Boolean; DesiredAccess: Integer);

Remarks

When the ProcessRestrictionsEnabled property is enabled, this method can be used to add an access rule that denies the process specified by ProcessFileName or ProcessId the access right specified by DesiredAccess.

Processes that are already running can be specified by passing their process Id (PID) for the ProcessId parameter (in which case ProcessFileName should be empty). Processes that have not yet started can be specified by passing the full filename of the process's executable file for ProcessFileName (in which case ProcessId should be set to 0). If ProcessName is empty, and ProcessId is -1, the new rule will apply to all processes. When adding a PID-based rule, you need to be aware of the PID Reuse behavior of Windows.

ChildProcesses controls whether the rule also applies to children of the target process.

DesiredAccess specifies the access right to deny; valid values are:

To remove the process access rule later, pass the same ProcessFileName and ProcessId values to the RemoveDeniedProcess method.

Note: This method can be called only when Active is True, and it cannot be called within events.

The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

AddGrantedProcess Method (CBMemoryDrive Component)

Adds a rule that allows a process to access the virtual drive.

Syntax

procedure AddGrantedProcess(ProcessFileName: String; ProcessId: Integer; ChildProcesses: Boolean; DesiredAccess: Integer);

Remarks

When the ProcessRestrictionsEnabled property is enabled, this method can be used to add an access rule that grants the process specified by ProcessFileName or ProcessId the access right specified by DesiredAccess.

Processes that are already running can be specified by passing their process Id (PID) for the ProcessId parameter (in which case ProcessFileName should be empty). Processes that have not yet started can be specified by passing the full filename of the process's executable file for ProcessFileName (in which case ProcessId should be set to 0). If ProcessName is empty, and ProcessId is -1, the new rule will apply to all processes. When adding a PID-based rule, you need to be aware of the PID Reuse behavior of Windows.

ChildProcesses controls whether the rule also applies to children of the target process.

DesiredAccess specifies the access right to grant; valid values are:

To remove the process access rule later, pass the same ProcessFileName and ProcessId values to the RemoveGrantedProcess method.

Note: This method can be called only when Active is True, and it cannot be called within events.

The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

AddMountingPoint Method (CBMemoryDrive Component)

Adds a mounting point for the virtual drive.

Syntax

procedure AddMountingPoint(MountingPoint: String; Flags: Integer; AuthenticationId: Int64);

Remarks

This method adds a new mounting point for the virtual drive (which must have already been created using OpenVault). Virtual drives may have as many mounting points as desired.

MountingPoint should be set to the name/path of the mounting point. The format of this value varies based what type of mounting point the application wishes to create; please refer to the Mounting Points topic for more information.

The Flags parameter is used to specify properties for the mounting point, and should be set by OR'ing together zero or more of the following flags:

Windows:

Linux and macOS:

For more information about the "-olocal" option of macFUSE, please refer to the macFUSE FAQ.

Windows:

If the STGMP_LOCAL flag is set, the AuthenticationId parameter should be set to the Authentication ID of the user session the mounting point should visible in; or to 0 to make the mounting point visible in the current user session. If the aforementioned flag is not set and AuthenticationId is 0, the mounting point will be global (i.e., visible in all user sessions). When AuthenticationId is set to a non-zero value, STGMP_LOCAL is implied. Please refer to the Mounting Points topic for more information.

Linux, macOS: The AuthenticationId parameter is ignored.

Note: This method cannot be called within events.

The methods and properties related to mounting points are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of mounting points occurs in a thread-safe manner.

Virtual Drives and Mounting Points

When applications call the OpenVault (CBVaultDrive) or CreateVault method, the specified vault is opened and used to create and mount a virtual drive. This virtual drive is created without a drive letter.

To add a drive letter for the virtual drive, applications have to call the AddMountingPoint method. Once a drive letter is assigned, the virtual drive will be visible to the system and other applications, allowing them to start accessing its files and directories.

CacheFilePassword Method (CBMemoryDrive Component)

This method caches an encryption password to use the next time a file or alternate stream is accessed or removes the cached password.

Syntax

procedure CacheFilePassword(FileName: String; Password: String; TTLInCache: Integer; RemoveFromCache: Boolean);

Remarks

This method temporarily caches an encryption password so that it can be used the next time the file or alternate stream specified by FileName is accessed.

The value passed for FileName must be a vault-local absolute path.

The Password parameter specifies the password to cache. It must match the one last used to encrypt the specified file or the alternate stream; otherwise, this method raises an exception.

The specified password is automatically removed from the cache as soon as one of the following things occur:

• The password is used to access the file or alternate stream and the value of the TTLInCache parameter is 0.
• The password for the file or alternate stream is changed.
• The vault is closed.
• The timeout expires.

To remove the previously cached password from the cache, set the RemoveFromCache parameter to True. When it is set so, the value of the Password parameter is ignored.

The TTLInCache parameter specifies time to seconds that the component keeps the password in the internal cache to reduce the number of requests for a password. The value of 0 tells the component to discard the password after the first use.

As an alternative to using this method, applications can provide a default file encryption password using the DefaultFileAccessPassword property or provide such passwords dynamically using the FilePasswordNeeded event.

Note: This method can be called only when Active is True.

CheckAndRepair Method (CBMemoryDrive Component)

This method checks a vault's consistency and repairs it as necessary.

Syntax

procedure CheckAndRepair(Flags: Integer);

Remarks

This method checks the consistency of a vault and attempts to repair it as necessary.

Applications should call this method if a vault has become corrupted (i.e., if the IsCorrupted property is True, or if a vault operation fails with a "Vault Corrupted" error). Be sure to make a vault backup before calling this method, because its repair efforts may cause data loss in cases of severe corruption. Please refer to the Vault Corruption topic for more information.

The Flags parameter is used to specify additional options, and it should be set by ORing together zero or more of the following flags:

Note: This method cannot be called when Active is True, and it cannot be called within events.

CheckFilePassword Method (CBMemoryDrive Component)

This method verifies whether a particular file password is correct.

Syntax

function CheckFilePassword(FileName: String; Password: String): Boolean;

Remarks

This method verifies whether the specified Password matches the one used to encrypt the file or alternate stream specified by FileName. If the password is correct, this method returns True; otherwise, it returns False.

The value passed for FileName must be a vault-local absolute path.

Please refer to the Encryption topic for more information.

Note: This method can be called only when Active is True.

CheckVaultPassword Method (CBMemoryDrive Component)

This method verifies whether a particular vault password is correct.

Syntax

function CheckVaultPassword(Password: String): Boolean;

Remarks

This method verifies whether the specified Password matches the one used to encrypt the vault. If the password is correct, this method returns True; otherwise, it returns False.

Please refer to the Encryption topic for more information.

Note: This method can be called only when Active is True.

CloseOpenedFilesSnapshot Method (CBMemoryDrive Component)

Closes the previously-created opened files snapshot.

Syntax

procedure CloseOpenedFilesSnapshot();

Remarks

This method closes the opened files snapshot previously created by CreateOpenedFilesSnapshot, releasing the memory associated with it. Please refer to that method's documentation for more information.

Note: This method cannot be called within events.

The methods and properties related to open files snapshots are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that creation, use, and cleanup of open files snapshots occurs in a thread-safe manner.

CloseVault Method (CBMemoryDrive Component)

Closes the vault.

Syntax

procedure CloseVault(Force: Boolean);

Remarks

This method closes the currently-open vault.

For CBVaultDrive, the Force parameter specifies whether to forcefully close any file or directory handles open currently. If Force is False, this method will fail if any handles are currently open.

Note: This method can be called only when Active is True.

CompactVault Method (CBMemoryDrive Component)

This method compacts the vault.

Syntax

function CompactVault(): Boolean;

Remarks

This method triggers vault compaction, which is a process that shrinks a vault's overall size by truncating its free space. If the compacting operation completes successfully, this method returns True; otherwise, it returns False.

Compaction involves physically moving a vault's occupied pages to the beginning of the vault, and then truncating the unoccupied pages from the end of the vault. The runtime of a compacting operation depends on a number of factors, and it is possible for it to be interrupted by other vault operations.

Compaction occurs automatically when the vault's free space percentage exceeds the threshold specified by the AutoCompactAt property. Applications can also use the AutoCompactDelay configuration setting to add a delay to the automatic compaction trigger.

Note: A vault opened in ReadOnly mode cannot be compacted, either automatically or explicitly.

Note: This method can be called only when Active is True, and it cannot be called within events.

Config Method (CBMemoryDrive Component)

Sets or retrieves a configuration setting.

Syntax

function Config(ConfigurationString: String): String;

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

ConvertToDrivePath Method (CBMemoryDrive Component)

Converts a vault-local vault item path to a virtual drive file path (Windows only).

Syntax

function ConvertToDrivePath(VaultFilePath: String): String;

Remarks

This method returns a virtual drive file path that corresponds to the vault item (file, directory, or symbolic link) specified by VaultFilePath.

The value passed for VaultFilePath must be a vault-local absolute path.

The value returned by this method is a fully-qualified file path formatted according to OS conventions, suitable for passing to system file APIs and/or external applications.

Note: This method can be called only when Active is True.

ConvertToVaultPath Method (CBMemoryDrive Component)

Converts a virtual drive file path to a vault-local vault item path (Windows only).

Syntax

function ConvertToVaultPath(VirtualFilePath: String): String;

Remarks

This method returns the vault-local absolute path of the vault item (file, directory, or symbolic link) that corresponds to the virtual drive file path specified by VirtualFilePath.

The value passed for VirtualFilePath must be a fully-qualified file path formatted according to OS conventions.

The value returned by this method can be used to access the corresponding vault item using the component APIs.

Note: This method can be called only when Active is True.

CreateDirectory Method (CBMemoryDrive Component)

This method creates a new directory in the vault.

Syntax

procedure CreateDirectory(Directory: String; CreateParents: Boolean);

Remarks

This method creates a new directory in the vault at the path specified by Directory.

The value passed for Directory must be a vault-local absolute path.

The CreateParents parameter specifies whether nonexistent parent directories in the specified path should be created as well. If this parameter is False, and one or more parent directories are missing, this method raises an exception.

Note: This method can be called only when Active is True, and it cannot be called within events.

CreateLink Method (CBMemoryDrive Component)

This method creates a symbolic link to another file in the vault.

Syntax

procedure CreateLink(LinkName: String; DestinationName: String);

Remarks

This method creates a new symbolic link named LinkName that points to the file specified by DestinationName.

The value passed for LinkName must be a vault-local absolute path. The value passed for DestinationName must also be a vault-local path, but it may be absolute or relative to LinkName.

Note: This method can be called only when Active is True, and it cannot be called within events.

CreateOpenedFilesSnapshot Method (CBMemoryDrive Component)

Creates a snapshot of information about files that are currently open.

Syntax

procedure CreateOpenedFilesSnapshot();

Remarks

This method creates a snapshot of information about all files and directories in the virtual filesystem that are currently open. This information is then used to populate the OpenFile* properties.

Note that there will always be at least one item in the OpenFile* properties since the virtual volume itself is always inherently open.

When the application is finished working with the opened files snapshot, it must close it by calling the CloseOpenedFilesSnapshot method in order to release the associated memory. If this method is called again before an existing snapshot is closed, the component will attempt to close it before creating a new one.

Note: This method can be called only when Active is True, and it cannot be called within events.

The methods and properties related to open files snapshots are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that creation, use, and cleanup of open files snapshots occurs in a thread-safe manner.

CreateVault Method (CBMemoryDrive Component)

Creates an in-memory vault.

Syntax

procedure CreateVault();

Remarks

This method creates a vault in memory using the properties and configuration settings, listed below. Please refer to each one's documentation for more information, including usage restrictions.

• AutoCompactAt property
• AutoCompactDelay configuration setting
• CaseSensitive property
• Logo property
• MaxNonPagedNameLength configuration setting
• PageSize property
• PathSeparator property
• ReadOnly property
• UseAccessTime property

Note: This method cannot be called when Active is True, and it cannot be called within events.

DeleteFile Method (CBMemoryDrive Component)

This method deletes a vault item.

Syntax

procedure DeleteFile(FileName: String);

Remarks

This method deletes the vault item (file, directory, symbolic link, or alternate stream) specified by FileName from the vault.

The value passed for FileName must be a vault-local absolute path.

Please note the following:

• When a file is deleted, any alternate streams it contains are deleted as well.
• Directories must be empty to be deleted; otherwise, this method raises an exception. Use the IsDirectoryEmpty method to check whether a directory is empty.
• Deleting a symbolic link only deletes the link itself, not the file it points to.

Note: This method can be called only when Active is True, and it cannot be called within events.

DeleteFileTag Method (CBMemoryDrive Component)

This method deletes a file tag.

Syntax

procedure DeleteFileTag(FileName: String; TagId: Integer; TagName: String);

Remarks

This method deletes the file tag identified by TagId or TagName from the file, directory, or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

To delete a raw file tag, pass its Id for TagId and pass an empty string for TagName. To delete a typed file tag, pass its name for TagName and pass 0 for TagId. If values are provided for both TagId and TagName, this method raises an exception.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

FileExists Method (CBMemoryDrive Component)

This method checks whether a vault item exists.

Syntax

function FileExists(FileName: String): Boolean;

Remarks

This method checks whether a vault item (file, directory, symbolic link, or alternate stream) with the specified FileName exists in the vault. If the specified vault item exists, this method returns True; otherwise, it returns False.

The value passed for FileName must be a vault-local absolute path.

Note: This method can be called only when Active is True.

FileMatchesMask Method (CBMemoryDrive Component)

This method checks whether a particular file or directory name matches the specified mask.

Syntax

function FileMatchesMask(Mask: String; FileName: String; CaseSensitive: Boolean): Boolean;

Remarks

This method checks whether the file or directory name specified by FileName matches Mask; if it does, this method returns True. The CaseSensitive parameter controls whether a case-sensitive match should be performed.

Note: This method does not handle so-called DOS_* wildcards (DOS_STAR, DOS_QM, DOS_DOT). The explanation about the characters can be found in the MSDN article. If you have a mask that includes one of those characters on Windows, you can use the RtlIsNameInExpression function of Windows API.

Note: As the explanation states, "When you do a case-insensitive search and do not provide a translation table, the name is converted to uppercase."

FileTagExists Method (CBMemoryDrive Component)

This method checks whether a file tag exists.

Syntax

function FileTagExists(FileName: String; TagId: Integer; TagName: String): Boolean;

Remarks

This method checks whether a file tag with the specified TagId or TagName is attached to the file, directory, or alternate stream specified by FileName. If the specified file tag exists, this method returns True; otherwise, it returns False.

The value passed for FileName must be a vault-local absolute path.

To check for a raw file tag, pass its Id for TagId and pass an empty string for TagName. To check for a typed file tag, pass its name for TagName and pass 0 for TagId. If values are provided for both TagId and TagName, this method raises an exception.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

FileTimeToNanoseconds Method (CBMemoryDrive Component)

This method returns the subsecond part of the time expressed in nanoseconds.

Syntax

function FileTimeToNanoseconds(FileTime: TDateTime): Integer;

Remarks

Use this method to obtain the subsecond part of the FileTime value, expressed in nanoseconds.

FileTimeToUnixTime Method (CBMemoryDrive Component)

This method converts FileTime to Unix time format.

Syntax

function FileTimeToUnixTime(FileTime: TDateTime): Int64;

Remarks

Use this method to convert the FileTime value to Unix time format. The subsecond part of the value is not preserved; to obtain it, use the FileTimeToNanoseconds method.

FindClose Method (CBMemoryDrive Component)

This method closes a search operation and releases any associated resources.

Syntax

procedure FindClose(SearchId: Int64);

Remarks

This method closes the search operation identified by SearchId, releasing any previously allocated resources associated with it.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

Note: This method can be called only when Active is True.

FindFirst Method (CBMemoryDrive Component)

This method searches for the first vault item that matches the specified name and attributes.

Syntax

function FindFirst(FileMask: String; Attributes: Integer; Flags: Integer): Int64;

Remarks

This method initiates a search operation based on the specified FileMask, Attributes, and Flags. If there are any matching vault items (files, directories, symbolic links, or alternate streams), then a search operation Id is returned. If there are no matching vault items, then -1 is returned.

To obtain information about a search result, pass the returned search handle to the following methods:

• GetSearchResultAttributes
• GetSearchResultCreationTime
• GetSearchResultFullName
• GetSearchResultLastAccessTime
• GetSearchResultLinkDestination
• GetSearchResultMetadataSize
• GetSearchResultModificationTime
• GetSearchResultName
• GetSearchResultSize

To retrieve the next search result, pass the returned search handle to the FindNext method. When an application is finished with (or wants to abandon) a search operation, it must pass the associated search handle to the FindClose method to release the resources associated with it.

Because each search operation is identified by the search handle associated with it, applications may initiate additional search operations at any time and may process each operation's search results in any manner it desires (e.g., sequentially, round robin).

The FileMask parameter specifies both the directory path to search within and the filename mask to match against (e.g., \directory\to\search\*.txt). Or, when searching a file's alternate streams, it specifies the file path and stream name mask (e.g., \path\to\file:*). Only the mask may contain wildcards. The path must be specified in vault-local absolute format. Also note that files without an extension will match *, but not *.*.

The Attributes parameter specifies the attributes to match against; items will match only if they have one or more of the specified attributes. The value passed for this parameter should be constructed by ORing together zero or more of the following values. Passing 0 will allow any file in a directory (or, any alternate stream in a file) to match; it is equivalent to VAULT_FATTR_FILE | VAULT_FATTR_DATA_STREAM.

The Flags parameter controls search behavior. Among other things, it can be used to request that only specific pieces of information be returned, which can greatly improve performance. The value passed for this parameter should be constructed by ORing together zero or more of the following values:

Note: This method can be called only when Active is True, and it cannot be called within events.

FindFirstByQuery Method (CBMemoryDrive Component)

This method searches for the first file or directory whose file tags match the specified query.

Syntax

function FindFirstByQuery(Directory: String; Query: String; Flags: Integer): Int64;

Remarks

This method initiates a search operation within the specified Directory for files and subdirectories whose typed file tags match the specified Query. If there are any matching files or directories, then a search operation Id is returned. If there are no matching files or directories, then -1 is returned.

To obtain information about a search result, pass the returned search handle to the following methods:

• GetSearchResultAttributes
• GetSearchResultCreationTime
• GetSearchResultFullName
• GetSearchResultLastAccessTime
• GetSearchResultLinkDestination
• GetSearchResultMetadataSize
• GetSearchResultModificationTime
• GetSearchResultName
• GetSearchResultSize

To retrieve the next search result, pass the returned search handle to the FindNext method. When an application is finished with (or wants to abandon) a search operation, it must pass the associated search handle to the FindClose method to release the resources associated with it.

Because each search operation is identified by the search handle associated with it, applications may initiate additional search operations at any time and may process each operation's search results in any manner it desires (e.g., sequentially, round robin).

The value passed for Directory must be a vault-local absolute path.

The value passed for Query must be a search query constructed using the CBFS Storage Query Language; please refer to that topic for more information.

The Flags parameter controls search behavior. Among other things, it can be used to request that only specific pieces of information be returned, which can greatly improve performance. The value passed for this parameter should be constructed by ORing together zero or more of the following values:

Note: This method can be called only when Active is True, and it cannot be called within events.

FindNext Method (CBMemoryDrive Component)

This method searches for the next vault item that matches an ongoing search operation.

Syntax

function FindNext(SearchId: Int64): Boolean;

Remarks

This method searches for the next vault item (file, directory, symbolic link, or alternate stream) that matches the ongoing search operation identified by SearchId. If a matching vault item is found, this method returns True; otherwise, it returns False.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery. Please refer to the methods' documentation for more information about search operations.

Note: This method can be called only when Active is True, and it cannot be called within events.

GetDriverStatus Method (CBMemoryDrive Component)

Retrieves the status of the system driver.

Syntax

function GetDriverStatus(ProductGUID: String; Module: Integer): Integer;

Remarks

This method retrieves the status of the system driver module specified by Module. This status can then be used to verify whether it has been properly installed and is ready for use.

The value returned by the method corresponds to the dwCurrentState field of the SERVICE_STATUS structure from the Windows API. It will be one of the following:

ProductGUID is used to distinguish between driver installations performed by different applications. Such information is necessary to guard against unexpected situations such as, e.g., the driver being uninstalled by one application despite other applications still needing it.

The GUID must be specified in so-called "Registry Format" (e.g., "{1FAD0EF2-9A03-4B87-B4BC-645B7035ED90}") with curly braces included.

To ensure proper operation, it is critical that each individual application have its own unique ProductGUID value, and that applications (and their installation scripts) use that value when calling any of the following methods:

• Install
• Uninstall
• GetDriverStatus
• GetModuleVersion
• RegisterIcon
• UnregisterIcon
• Initialize

The Module parameter specifies which driver module to query the status of. Possible values are:

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter.

Note: This method cannot be called within events.

GetFileAttributes Method (CBMemoryDrive Component)

This method retrieves the attributes of a vault item.

Syntax

function GetFileAttributes(FileName: String): Integer;

Remarks

This method retrieves the attributes of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The specified vault item's attributes are returned as a 32-bit integer composed of one or more of the following values:

Note: This method can be called only when Active is True.

GetFileCompression Method (CBMemoryDrive Component)

This method retrieves the compression mode of a file or alternate stream.

Syntax

function GetFileCompression(FileName: String): Integer;

Remarks

This method retrieves the compression mode of the file or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The returned compression mode will be one of the following values:

Applications that use custom compression must implement the DataCompress and DataDecompress events. Please refer to the Compression topic for more information.

Note: This method can be called only when Active is True.

GetFileCreationTime Method (CBMemoryDrive Component)

This method retrieves the creation time of a vault item.

Syntax

function GetFileCreationTime(FileName: String): TDateTime;

Remarks

This method retrieves the creation time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName. The timestamps returned by this method are specified in UTC.

The value passed for FileName must be a vault-local absolute path.

Note: This method can be called only when Active is True.

GetFileEncryption Method (CBMemoryDrive Component)

This method retrieves the encryption mode of a file or alternate stream.

Syntax

function GetFileEncryption(FileName: String): Integer;

Remarks

This method retrieves the encryption mode of the file or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The returned encryption mode will be one of the following values:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

Note: This method can be called only when Active is True.

GetFileLastAccessTime Method (CBMemoryDrive Component)

This method retrieves the last access time of a vault item.

Syntax

function GetFileLastAccessTime(FileName: String): TDateTime;

Remarks

This method retrieves the creation time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName. The timestamps returned by this method are specified in UTC.

Note: Vault items' last access times are updated only if the UseAccessTime property is enabled.

The value passed for FileName must be a vault-local absolute path.

Note: This method can be called only when Active is True.

GetFileModificationTime Method (CBMemoryDrive Component)

This method retrieves the modification time of a vault item.

Syntax

function GetFileModificationTime(FileName: String): TDateTime;

Remarks

This method retrieves the modification time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName. The timestamps returned by this method are specified in UTC.

The value passed for FileName must be a vault-local absolute path.

Note: This method can be called only when Active is True.

GetFileSize Method (CBMemoryDrive Component)

This method retrieves the size of a file or alternate stream.

Syntax

function GetFileSize(FileName: String): Int64;

Remarks

This method retrieves the size, in bytes, of the file or alternate stream specified by FileName.

Note: For files, the returned value reflects only the size of the file's immediate contents, it does not account for any alternate streams the file may or may not contain.

The value passed for FileName must be a vault-local absolute path.

Note: This method can be called only when Active is True.

GetFileTag Method (CBMemoryDrive Component)

This method retrieves the binary data held by a raw file tag attached to the specified vault item.

Syntax

function GetFileTag(FileName: String; TagId: Integer): TBytes;

Remarks

This method retrieves the binary data held by a raw file tag, identified by TagId, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a raw file tag with the specified TagId is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagId must be in the range 0x0001 to 0xCFFF (inclusive).

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetFileTagAsAnsiString Method (CBMemoryDrive Component)

This method retrieves the value of an AnsiString-typed file tag attached to the specified vault item.

Syntax

function GetFileTagAsAnsiString(FileName: String; TagName: String): String;

Remarks

This method retrieves the value of an AnsiString-typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If an AnsiString-typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

Please refer to the File Tags topic for more information.

This method can only retrieve typed file tags created with the SetFileTagAsAnsiString method. Typed file tags created with the SetFileTagAsString method must be retrieved using the GetFileTagAsString method.

Note: This method can be called only when Active is True.

GetFileTagAsBoolean Method (CBMemoryDrive Component)

This method retrieves the value of a Boolean-typed file tag attached to the specified vault item.

Syntax

function GetFileTagAsBoolean(FileName: String; TagName: String): Boolean;

Remarks

This method retrieves the value of a Boolean-typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a Boolean-typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetFileTagAsDateTime Method (CBMemoryDrive Component)

This method retrieves the value of a DateTime-typed file tag attached to the specified vault item.

Syntax

function GetFileTagAsDateTime(FileName: String; TagName: String): TDateTime;

Remarks

This method retrieves the value of a DateTime-typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a DateTime-typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The timestamps returned by this method are specified in UTC.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetFileTagAsNumber Method (CBMemoryDrive Component)

This method retrieves the value of a Number-typed file tag attached to the specified vault item.

Syntax

function GetFileTagAsNumber(FileName: String; TagName: String): Int64;

Remarks

This method retrieves the value of a Number-typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a Number-typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetFileTagAsString Method (CBMemoryDrive Component)

This method retrieves the value of a String-typed file tag attached to the specified vault item.

Syntax

function GetFileTagAsString(FileName: String; TagName: String): String;

Remarks

This method retrieves the value of a String-typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a String-typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

Please refer to the File Tags topic for more information.

This method can only retrieve typed file tags created with the SetFileTagAsString method. Typed file tags created with the SetFileTagAsAnsiString method must be retrieved using the GetFileTagAsAnsiString method.

Note: This method can be called only when Active is True.

GetFileTagDataType Method (CBMemoryDrive Component)

This method retrieves the data type of a typed file tag attached to a specific vault item.

Syntax

function GetFileTagDataType(FileName: String; TagName: String): Integer;

Remarks

This method retrieves the data type of a typed file tag, identified by TagName, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a typed file tag with the specified TagName is not attached to the specified vault item, this method raises an exception.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The value returned by this method will be one of the following (except VAULT_TDT_RAWDATA, which is not applicable):

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetFileTagSize Method (CBMemoryDrive Component)

This method retrieves the size of a raw file tag attached to the specified vault item.

Syntax

function GetFileTagSize(FileName: String; TagId: Integer): Integer;

Remarks

This method retrieves the size of the binary data held by a raw file tag, identified by TagId, attached to the vault item (e.g., file, directory, or alternate stream) specified by FileName. If a raw file tag with the specified TagId is not attached to the specified vault item, this method returns 0 as the tag size.

The value passed for FileName must be a vault-local absolute path. The value passed for TagId must be in the range 0x0001 to 0xCFFF (inclusive).

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True.

GetModuleVersion Method (CBMemoryDrive Component)

Retrieves the version of a given product module.

Syntax

function GetModuleVersion(ProductGUID: String; Module: Integer): Int64;

Remarks

This method retrieves the version of the product module specified by Module. The value is returned as a 64-bit integer composed of four 16-bit words that each correspond to a piece of the overall module version. For example, a version of 2.32.6.28 would cause the value 0x000200200006001C to be returned.

If the specified module is not installed, this method returns 0.

ProductGUID is used to distinguish between driver installations performed by different applications. Such information is necessary to guard against unexpected situations such as, e.g., the driver being uninstalled by one application despite other applications still needing it.

The GUID must be specified in so-called "Registry Format" (e.g., "{1FAD0EF2-9A03-4B87-B4BC-645B7035ED90}") with curly braces included.

To ensure proper operation, it is critical that each individual application have its own unique ProductGUID value, and that applications (and their installation scripts) use that value when calling any of the following methods:

• Install
• Uninstall
• GetDriverStatus
• GetModuleVersion
• RegisterIcon
• UnregisterIcon
• Initialize

The Module parameter specifies which driver module to query the status of. Possible values are:

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter.

Note: This method cannot be called within events.

GetOriginatorProcessId Method (CBMemoryDrive Component)

Retrieves the Id of the process (PID) that initiated the operation.

Syntax

function GetOriginatorProcessId(): Integer;

Remarks

This method can be called within the FilePasswordNeeded and FileAccess events to retrieve the Id of the process (PID) that initiated the operation. If the query fails, this method returns 0.

Please note that PIDs are not unique, and may be reused by different processes over time (though in practice, this is uncommon).

CBVaultDrive/Windows-specific: Applications cannot use this method to retrieve information about remote processes accessing virtual drives shared on the network. Windows does not provide such information due to the nature of remote access.

GetOriginatorProcessName Method (CBMemoryDrive Component)

Retrieves the name of the process that initiated the operation.

Syntax

function GetOriginatorProcessName(): String;

Remarks

This method can be called within the FilePasswordNeeded and and FileAccess events to retrieve the name of the process that initiated the operation. If the query fails, this method returns empty string.

CBVaultDrive/Windows-specific: Applications cannot use this method to retrieve information about remote processes accessing virtual drives shared on the network. Windows does not provide such information due to the nature of remote access.

GetOriginatorThreadId Method (CBMemoryDrive Component)

Retrieves the Id of the thread that initiated the operation (Windows only).

Syntax

function GetOriginatorThreadId(): Integer;

Remarks

This method can be called within the FilePasswordNeeded and FileAccess events to retrieve the Id of the thread that initiated the operation. If the query fails, this method returns 0.

Please note that thread Ids are not unique, and may be reused by different threads over time.

GetOriginatorToken Method (CBMemoryDrive Component)

Retrieves the security token associated with the process that initiated the operation (Windows only).

Syntax

function GetOriginatorToken(): Int64;

Remarks

This method can be called within the FilePasswordNeeded event to retrieve the security token associated with the process that initiated the operation. If the query fails, this method returns INVALID_HANDLE_VALUE.

The security token returned by this method can be passed to the Windows API's GetTokenInformation function to obtain more information about the process.

Important: When applications are finished using the returned security token, they must close it using the Windows API's CloseHandle function.

Network Access Notes (CBVaultDrive-specific)

For virtual drives shared on the network, applications may wish to obtain information about the network users accessing it (e.g., account names). Drives can be shared in several modes in Windows, which can affect the information retrievable via the security token this method returns:

• Authenticated mode, in which case the Helper DLL (which, in general, is responsible for relaying remote drive requests to and from the system driver) will impersonate the network user, allowing that account's actual information to be retrieved.
• Guest mode, in which case the retrievable information is for the system's GUEST account.
• Administrative shares (those which exist by default and whose names end with '$'; e.g., C$, ADMIN$, etc.), in which case the retrievable information is for the LOCAL_SYSTEM account.

GetSearchResultAttributes Method (CBMemoryDrive Component)

This method retrieves the attributes of a vault item found during a search operation.

Syntax

function GetSearchResultAttributes(SearchId: Int64): Integer;

Remarks

This method retrieves the attributes of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

The vault item's attributes are returned as a 32-bit integer composed of one or more of the following values:

If, however, attributes were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_ATTRIBUTES for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return 0. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultCreationTime Method (CBMemoryDrive Component)

This method retrieves the creation time of a vault item found during a search operation.

Syntax

function GetSearchResultCreationTime(SearchId: Int64): TDateTime;

Remarks

This method retrieves the creation time of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

The timestamps returned by this method are specified in UTC.

If times were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_TIMES for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return January 1, 1601 00:00:00 UTC. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultFullName Method (CBMemoryDrive Component)

This method retrieves the fully qualified name of a vault item found during a search operation.

Syntax

function GetSearchResultFullName(SearchId: Int64): String;

Remarks

This method retrieves the fully qualified name of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId (i.e., the vault item's vault-local absolute path). Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

If fully qualified names were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_FULL_NAME for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return an empty string. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultLastAccessTime Method (CBMemoryDrive Component)

This method retrieves the last access time of a vault item found during a search operation.

Syntax

function GetSearchResultLastAccessTime(SearchId: Int64): TDateTime;

Remarks

This method retrieves the creation time of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

The timestamps returned by this method are specified in UTC.

If times were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_TIMES for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return January 1, 1601 00:00:00 UTC. Please refer to the documentation for these methods for more information.

Note: Vault items' last access times are updated only if the UseAccessTime property is enabled.

Note: This method can be called only when Active is True.

GetSearchResultLinkDestination Method (CBMemoryDrive Component)

This method retrieves the destination of a symbolic link found during a search operation.

Syntax

function GetSearchResultLinkDestination(SearchId: Int64): String;

Remarks

This method retrieves the fully qualified name of a symbolic link found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

If the most recently found vault item is not a symbolic link, or if symbolic link destinations were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_LINK_DEST for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return an empty string. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultMetadataSize Method (CBMemoryDrive Component)

This method retrieves the size of the metadata associated with a vault item found during a search operation.

Syntax

function GetSearchResultMetadataSize(SearchId: Int64): Int64;

Remarks

This method retrieves the size of the metadata associated with a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The metadata size of a vault item reflects the total size of all vault pages associated with it that do not contain actual file/stream data; this includes file tags (both internal and application defined), index pages, B-trees, and all other "filesystem information".

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

If metadata sizes were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_METADATA_SIZE for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return 0. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultModificationTime Method (CBMemoryDrive Component)

This method retrieves the modification time of a vault item found during a search operation.

Syntax

function GetSearchResultModificationTime(SearchId: Int64): TDateTime;

Remarks

This method retrieves the modification time of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

The timestamps returned by this method are specified in UTC.

If times were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_TIMES for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return January 1, 1601 00:00:00 UTC. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultName Method (CBMemoryDrive Component)

This method retrieves the name of a vault item found during a search operation.

Syntax

function GetSearchResultName(SearchId: Int64): String;

Remarks

This method retrieves the name of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

The names returned by this method do not include a path; use GetSearchResultFullName if a path is needed.

If names were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_NAME for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return an empty string. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

GetSearchResultSize Method (CBMemoryDrive Component)

This method retrieves the size of a vault item found during a search operation.

Syntax

function GetSearchResultSize(SearchId: Int64): Int64;

Remarks

This method retrieves the size of a vault item (e.g., file, directory, symbolic link, or alternate stream) found via FindFirst/FindFirstByQuery/FindNext as part of the search operation identified by SearchId. Please refer to those methods' documentation for more information.

Note: For files, the returned value reflects only the size of the file's immediate contents; it does not account for any alternate streams the file may or may not contain.

The value passed for SearchId must be a search operation Id returned by FindFirst or FindFirstByQuery.

If the vault item is a directory, or if sizes were not requested as part of the specified search operation (by passing either 0 or a value including VAULT_FF_NEED_SIZE for the FindFirst/FindFirstByQuery method's Flags parameter), this method will always return 0. Please refer to the documentation for these methods for more information.

Note: This method can be called only when Active is True.

Initialize Method (CBMemoryDrive Component)

This method initializes the component.

Syntax

procedure Initialize(ProductGUID: String);

Remarks

This method initializes the component and must be called each time the application starts before attempting to call any of the component's other methods with the exception of installation-related methods.

ProductGUID is used to distinguish between driver installations performed by different applications. Such information is necessary to guard against unexpected situations such as, e.g., the driver being uninstalled by one application despite other applications still needing it.

The GUID must be specified in so-called "Registry Format" (e.g., "{1FAD0EF2-9A03-4B87-B4BC-645B7035ED90}") with curly braces included.

To ensure proper operation, it is critical that each individual application have its own unique ProductGUID value, and that applications (and their installation scripts) use that value when calling any of the following methods:

• Install
• Uninstall
• GetDriverStatus
• GetModuleVersion
• RegisterIcon
• UnregisterIcon
• Initialize

If the required driver was not installed using the Install method with the same value of ProductGUID, Initialize will return a ERROR_FILE_NOT_FOUND error (Win32 error code 2).

If the loaded kernel-mode driver is older than the user-mode API, Initialize will return a ERROR_INVALID_KERNEL_INFO_VERSION error (Win32 error code 340). In this situation, an update of the driver using the Install method is required before the component can be used.

Install Method (CBMemoryDrive Component)

Installs (or upgrades) the product's system drivers and/or the helper DLL (Windows only).

Syntax

function Install(CabFileName: String; ProductGUID: String; PathToInstall: String; ModulesToInstall: Integer; Flags: Integer): Integer;

Remarks

This method is used to install or upgrade the product's various modules (i.e., the system drivers and the Helper DLL). The ModulesToInstall parameter selects which modules should be installed. If the system must be rebooted to complete the installation process, this method will return a non-zero value indicating which module(s) requested the reboot (out of those initially selected).

Important: To upgrade the product's modules, use only the Install method. Previously installed versions of the modules should not be uninstalled first. Calling the Install method will upgrade the previously installed version.

Please refer to the Driver Installation in Windows topic for more information.

CabFileName must be the path of the .cab file containing the product modules. Important: This .cab file must remain on the target system (or be available in some other way) after installation, as it is required for uninstalling the modules from the system.

ProductGUID is used to distinguish between driver installations performed by different applications. Such information is necessary to guard against unexpected situations such as, e.g., the driver being uninstalled by one application despite other applications still needing it.

The GUID must be specified in so-called "Registry Format" (e.g., "{1FAD0EF2-9A03-4B87-B4BC-645B7035ED90}") with curly braces included.

To ensure proper operation, it is critical that each individual application have its own unique ProductGUID value, and that applications (and their installation scripts) use that value when calling any of the following methods:

• Install
• Uninstall
• GetDriverStatus
• GetModuleVersion
• RegisterIcon
• UnregisterIcon
• Initialize

PathToInstall controls where the modules are installed. Pass empty string (highly recommended) to automatically install them to the appropriate Windows system directory.

ModulesToInstall should contain one or more of the following flags, OR'd together:

Flags specifies various installation options, and should contain zero or more of the following flags, OR'd together:

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter.

This method requires administrative rights to execute successfully. If the user account of the process that calls this method doesn't have such rights, the call will fail with an ERROR_PRIVILEGE_NOT_HELD ($0522) error.

Note: This method cannot be called within events.

IsDirectoryEmpty Method (CBMemoryDrive Component)

This method checks whether a directory is empty.

Syntax

function IsDirectoryEmpty(Directory: String): Boolean;

Remarks

This method checks whether the directory specified by Directory is empty (i.e., does not contain any files, subdirectories, or symbolic links). If the specified directory is empty, this method returns True; otherwise, it returns False.

The value passed for Directory must be a vault-local absolute path.

Note: This method can be called only when Active is True.

IsIconRegistered Method (CBMemoryDrive Component)

Checks whether the specified icon is registered (Windows only).

Syntax

function IsIconRegistered(IconId: String): Boolean;

Remarks

This method checks whether an icon with the specified IconId has been registered. If such an icon has been registered, this method returns True; otherwise it returns False.

Icons can be registered using the RegisterIcon method. Please refer to that method's documentation, as well as the Custom Drive Icons topic, for more information.

The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.

LoadFromFile Method (CBMemoryDrive Component)

Copies contents of a file-based vault into the in-memory vault.

Syntax

procedure LoadFromFile(FileName: String);

Remarks

This method loads the contents of the vault, specified by FileName, into the component.

If the in-memory vault is not opened, LoadFromFileopens an in-memory vault. If the in-memory vault is already opened, it is closed by this method.

If the vault is encrypted, then before calling LoadFromFile, the application should set proper values to VaultEncryption and VaultPassword properties.

Note: This method can be called only when Active is True, and it cannot be called within events.

MoveFile Method (CBMemoryDrive Component)

This method renames or moves a vault item.

Syntax

procedure MoveFile(OldFileName: String; NewFileName: String; Overwrite: Boolean);

Remarks

This method renames or moves a vault item (e.g., file, directory, symbolic link, or alternate stream) from the specified OldFileName to the specified NewFileName. For alternate streams, renaming is always possible, but moving them from one file to another is allowed only if the AllowMoveStreamsBetweenFiles configuration setting is enabled.

The values passed for OldFileName and NewFileName must both be vault-local absolute paths (including the item's old and new names, respectively) in the same vault.

The Overwrite parameter specifies what to do if a vault item with the specified NewFileName already exists. If Overwrite is True, and such an item exists, it will be overwritten by the item specified by OldFileName. But if such an item exists, and Overwrite is False, this method raises an exception.

Note: The usual rules of deletion still apply for an item being overwritten. Notably, a nonempty directory cannot be overwritten.

Note: This method can be called only when Active is True, and it cannot be called within events.

OpenFile Method (CBMemoryDrive Component)

This method opens a new or existing file or alternate stream in the vault.

Syntax

function OpenFile(FileName: String; OpenMode: Integer; ReadEnabled: Boolean; WriteEnabled: Boolean; Password: String): TCBFSStorageStream;

Remarks

This method opens the file or alternate stream specified by FileName, creating it if necessary based on the specified OpenMode, and returns a stream object that provides access to its data.

Note: Files and alternate streams cannot be created or written to if the vault is open in ReadOnly mode.

The value passed for FileName must be a vault-local absolute path.

The OpenMode parameter specifies what behavior to use when opening a file or alternate stream. Valid values are as follows:

The ReadEnabled and WriteEnabled parameters specify which kinds of access the returned stream object should permit.

Note: WriteEnabled is ignored if ReadOnly is True.

The Password parameter works as follows:

• If the specified file or alternate stream already exists and is encrypted, the specified Password is used to decrypt and access its data.
• If a new file or alternate stream is created, and the DefaultFileEncryption property is not VAULT_EM_NONE, the specified Password is used to encrypt it.

Internally, this method simply calls OpenFileEx, passing on all shared parameters' values and using the following defaults for the others:

• ShareDenyRead and ShareDenyWrite use True.
• Encryption uses the current DefaultFileEncryption value.
• Compression and CompressionLevel use the current DefaultFileCompression and DefaultFileCompressionLevel values, respectively.
• PagesPerBlock uses 16.

Note: This method can be called only when Active is True, and it cannot be called within events.

OpenFileEx Method (CBMemoryDrive Component)

This method opens a new or existing file or alternate stream in the vault.

Syntax

function OpenFileEx(FileName: String; OpenMode: Integer; ReadEnabled: Boolean; WriteEnabled: Boolean; ShareDenyRead: Boolean; ShareDenyWrite: Boolean; Encryption: Integer; Password: String; Compression: Integer; CompressionLevel: Integer; PagesPerBlock: Integer): TCBFSStorageStream;

Remarks

This method opens the file or alternate stream specified by FileName, creating it if necessary based on the specified OpenMode, and returns a stream object that provides access to its data.

Note: Files and alternate streams cannot be created or written to if the vault is open in ReadOnly mode.

The value passed for FileName must be a vault-local absolute path.

The OpenMode parameter specifies what behavior to use when opening a file or alternate stream. Valid values are as follows:

The ReadEnabled and WriteEnabled parameters specify which kinds of access the returned stream object should permit.

Note: WriteEnabled is ignored if ReadOnly is True.

The ShareDenyRead and ShareDenyWrite parameters specify whether other accessors may read and/or write the specified file or alternate stream simultaneously. To prevent simultaneous read and/or write access, pass True; to allow it, pass False.

The Encryption parameter specifies the encryption mode to use when creating a file or alternate stream. Valid values are as follows:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

The Password parameter works as follows:

• If the specified file or alternate stream already exists and is encrypted, the specified Password is used to decrypt and access its data.
• If a file or alternate stream is created, and Encryption is not VAULT_EM_NONE, the specified Password is used to encrypt it.

The Compression parameter specifies the compression mode to use when creating a file or alternate stream. Valid values are as follows:

Applications that use custom compression must implement the DataCompress and DataDecompress events. Please refer to the Compression topic for more information.

The CompressionLevel parameter specifies the compression level to use, if applicable.

The PagesPerBlock parameter specifies how many pages should be compressed as a single block, if applicable. Valid values are powers of 2 up to and including 128 (i.e., 2, 4, 8, 16, 32, 64, or 128), or 0, which is interpreted as "default" (currently 16 for both zlib and run-length encoding [RLE]). Larger values allow for more efficient compression; however, because a block must be decompressed (and, for writes, recompressed) anytime its data are accessed, larger values can also cause excessive slowdown, especially for random access.

Note: This method can be called only when Active is True, and it cannot be called within events.

OpenRootData Method (CBMemoryDrive Component)

This method opens the vault's root data stream.

Syntax

function OpenRootData(): TCBFSStorageStream;

Remarks

This method opens the vault's root data stream, returning a stream object that provides access to its data.

Please refer to the Using RootData topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

RegisterIcon Method (CBMemoryDrive Component)

Registers an icon that can be displayed as an overlay on the virtual drive in Windows Explorer (Windows only).

Syntax

function RegisterIcon(IconPath: String; ProductGUID: String; IconId: String): Boolean;

Remarks

This method registers an icon in the file specified by IconPath so that it can later be used to display an overlay on the virtual drive in Windows Explorer. If the system must be rebooted before the icon can be used, this method returns True, otherwise it returns False.

Please note that this method only registers overlay icons; Applications should call the SetIcon and ResetIcon methods to select an icon for display. Please refer to the Custom Drive Icons topic for more information.

IconPath must be the full path and file name of the .ico file whose icon should be registered. The file must exist and remain available in order for the icon to be used until the icon is unregistered using UnregisterIcon.

ProductGUID is used to distinguish between driver installations performed by different applications. Such information is necessary to guard against unexpected situations such as, e.g., the driver being uninstalled by one application despite other applications still needing it.

The GUID must be specified in so-called "Registry Format" (e.g., "{1FAD0EF2-9A03-4B87-B4BC-645B7035ED90}") with curly braces included.

To ensure proper operation, it is critical that each individual application have its own unique ProductGUID value, and that applications (and their installation scripts) use that value when calling any of the following methods:

• Install
• Uninstall
• GetDriverStatus
• GetModuleVersion
• RegisterIcon
• UnregisterIcon
• Initialize

IconId specifies an identifier that can later be passed to the SetIcon and UnregisterIcon methods. Each registered icon should have a unique IconId value; if a value is passed that is already in use, the existing icon will be removed (by calling UnregisterIcon internally) before the new one is registered.

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter. The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.

This method requires administrative rights to execute successfully. If the user account of the process that calls this method doesn't have such rights, the call will fail with an ERROR_PRIVILEGE_NOT_HELD ($0522) error.

Note: This method cannot be called within events.

RemoveDeniedProcess Method (CBMemoryDrive Component)

Removes a rule that prevents a process from accessing the virtual drive.

Syntax

procedure RemoveDeniedProcess(ProcessFileName: String; ProcessId: Integer);

Remarks

When the ProcessRestrictionsEnabled property is enabled, this method can be used to remove an access rule previously added with the AddDeniedProcess method.

Pass the same values for ProcessFileName and ProcessId as were used to add the rule when AddDeniedProcess was called previously. Please refer to that method's documentation for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

RemoveGrantedProcess Method (CBMemoryDrive Component)

Removes a rule that allows a process to access the virtual drive.

Syntax

procedure RemoveGrantedProcess(ProcessFileName: String; ProcessId: Integer);

Remarks

When the ProcessRestrictionsEnabled property is enabled, this method can be used to remove an access rule previously added with the AddGrantedProcess method.

Pass the same values for ProcessFileName and ProcessId as were used to add the rule when AddGrantedProcess was called previously. Please refer to that method's documentation for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

The methods and properties related to process access lists are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of process access information occurs in a thread-safe manner.

RemoveMountingPoint Method (CBMemoryDrive Component)

Removes a mounting point for the virtual drive.

Syntax

procedure RemoveMountingPoint(Index: Integer; MountingPoint: String; Flags: Integer; AuthenticationId: Int64);

Remarks

This method removes a previously-created mounting point for the virtual drive.

Index must be set to the index of an item in the MountingPoint* properties, or to -1 to remove an item based on the other method parameters.

If Index is -1, then the same values must be passed for MountingPoint, Flags, AuthenticationId as were used to add the mounting point when AddMountingPoint was called previously. Please refer to that method's documentation for more information. (If Index is not -1, these parameters are ignored.)

The sgSTGMPDRIVELETTERNOTIFYASYNC; flag may be passed in Flags to send notifications about removal of the mounting point asynchronously. Do not use this flag if the process quits right after a call to this method because asynchronous delivery involves a secondary thread, which will be terminated when the process quits.

Note: This method cannot be called within events.

The methods and properties related to mounting points are not intended to be used from multiple threads at once. Applications that wish to use said methods and properties from multiple threads are responsible for employing proper thread synchronization techniques to ensure that manipulation and enumeration of mounting points occurs in a thread-safe manner.

ResetIcon Method (CBMemoryDrive Component)

Resets the virtual drive's icon back to default by deselecting the active overlay icon (Windows only).

Syntax

procedure ResetIcon();

Remarks

This method deselects the overlay icon currently in use, thus resetting the virtual drive's icon back to its default state (i.e., displayed without any overlay icons).

Please refer to the SetIcon method, as well as the Custom Drive Icons topic, for more information.

The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.

Note: This method can be called only after creating a virtual drive, and it cannot be called within events.

ResolveLink Method (CBMemoryDrive Component)

This method retrieves the destination of a symbolic link.

Syntax

function ResolveLink(LinkName: String; Normalize: Boolean): String;

Remarks

This method retrieves the destination pointed to by the symbolic link specified by LinkName.

The value passed for LinkName must be a vault-local absolute path.

As the CreateLink method's documentation describes, symbolic links can be created with either relative or absolute vault-local paths. The Normalize parameter specifies whether the component should normalize the specified link's destination before returning it. Passing True will ensure a vault-local absolute path is always returned; passing False will cause the original destination path to be returned.

Note: This method can be called only when Active is True.

SaveToFile Method (CBMemoryDrive Component)

Copies contents of the in-memory vault into a file-based vault.

Syntax

procedure SaveToFile(FileName: String);

Remarks

This method saves the in-memory vault into the file specified by the FileName parameter.

The vault is saved "as is", with all parameters including encryption which were set for the in-memory vault.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileAttributes Method (CBMemoryDrive Component)

This method sets the attributes of a vault item.

Syntax

procedure SetFileAttributes(FileName: String; Attributes: Integer);

Remarks

This method sets the attributes of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The Attributes parameter specifies the new attributes for the vault item, which should be constructed by ORing together one or more of the following values:

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileCompression Method (CBMemoryDrive Component)

This method compresses or decompresses a file or alternate stream.

Syntax

procedure SetFileCompression(FileName: String; Compression: Integer; CompressionLevel: Integer; PagesPerBlock: Integer; Password: String);

Remarks

This method changes the compression mode used to compress the file or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The Compression parameter specifies the new compression mode to use. Valid values are as follows:

Applications that use custom compression must implement the DataCompress and DataDecompress events. Please refer to the Compression topic for more information.

The CompressionLevel parameter specifies the compression level to use, if applicable.

The PagesPerBlock parameter specifies how many pages should be compressed as a single block, if applicable. Valid values are powers of 2 up to and including 128 (i.e., 2, 4, 8, 16, 32, 64, or 128), or 0, which is interpreted as "default" (currently 16 for both zlib and run-length encoding [RLE]). Larger values allow for more efficient compression; however, because a block must be decompressed (and, for writes, recompressed) anytime its data are accessed, larger values can also cause excessive slowdown, especially for random access.

The Password parameter specifies the password to use to access the file's data, if it is encrypted.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileCreationTime Method (CBMemoryDrive Component)

This method sets the creation time of a vault item.

Syntax

procedure SetFileCreationTime(FileName: String; CreationTime: TDateTime);

Remarks

This method sets the creation time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The CreationTime parameter specifies the new creation time for the vault item, which must be specified in UTC.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileEncryption Method (CBMemoryDrive Component)

This method encrypts, decrypts, or changes the encryption password of a file or alternate stream.

Syntax

procedure SetFileEncryption(FileName: String; Encryption: Integer; OldPassword: String; NewPassword: String);

Remarks

This method changes the encryption mode or password used to encrypt the file or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The Encryption parameter specifies the new encryption mode to use. Valid values are as follows:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

The OldPassword parameter specifies the current encryption password, if applicable.

The NewPassword parameter specifies the new encryption password to use, if applicable.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileLastAccessTime Method (CBMemoryDrive Component)

This method sets the last access time of a vault item.

Syntax

procedure SetFileLastAccessTime(FileName: String; LastAccessTime: TDateTime);

Remarks

This method sets the last access time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The LastAccessTime parameter specifies the new last access time for the vault item, which must be specified in UTC.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileModificationTime Method (CBMemoryDrive Component)

This method sets the modification time of a vault item.

Syntax

procedure SetFileModificationTime(FileName: String; ModificationTime: TDateTime);

Remarks

This method sets the modification time of the vault item (e.g., file, directory, symbolic link, or alternate stream) specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The ModificationTime parameter specifies the new modification time for the vault item, which must be specified in UTC.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileSize Method (CBMemoryDrive Component)

This method sets the size of a file or alternate stream.

Syntax

procedure SetFileSize(FileName: String; Size: Int64; Password: String);

Remarks

This method sets the size of the file or alternate stream specified by FileName.

The value passed for FileName must be a vault-local absolute path.

The Size parameter specifies the new size of the file or alternate stream, which must be greater than or equal to 0.

Applications can also change the size of a file or alternate stream using the stream objects returned by the OpenFile and OpenFileEx methods.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTag Method (CBMemoryDrive Component)

This method attaches a raw file tag with binary data to the specified vault item.

Syntax

procedure SetFileTag(FileName: String; TagId: Integer; Data: TBytes);

Remarks

This method attaches a raw file tag with binary data to the vault item (e.g., file, directory, or alternate stream) specified by FileName using the specified TagId. If a raw file tag with the specified TagId is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagId must be in the range 0x0001 to 0xCFFF (inclusive).

The Data parameter specifies the raw binary data to store in the file tag; it may be up to 65531 bytes in length.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTagAsAnsiString Method (CBMemoryDrive Component)

This method attaches an AnsiString-typed file tag to the specified vault item.

Syntax

procedure SetFileTagAsAnsiString(FileName: String; TagName: String; Value: String);

Remarks

This method attaches an AnsiString-typed file tag to the vault item (e.g., file, directory, or alternate stream) specified by FileTag using the specified TagName. If a typed file tag with the specified TagName is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The Value parameter specifies the AnsiString value to store in the file tag; it may be up to 65529 - (name_length * 2) bytes in length (where name_length is measured in characters), including null terminators for both the AnsiString value and the name.

Please refer to the File Tags topic for more information.

Note: AnsiString file tag values are converted to UTF-16LE when referenced in a search query string. To reduce the chance of string-conversion-related issues, it is recommended that applications only store ASCII characters in AnsiString-typed file tags, and prefer String-typed file tags (created using SetFileTagAsString) in all other cases.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTagAsBoolean Method (CBMemoryDrive Component)

This method attaches a Boolean-typed file tag to the specified vault item.

Syntax

procedure SetFileTagAsBoolean(FileName: String; TagName: String; Value: Boolean);

Remarks

This method attaches a Boolean-typed file tag to the vault item (e.g., file, directory, or alternate stream) specified by FileTag using the specified TagName. If a typed file tag with the specified TagName is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The Value parameter specifies the Boolean value to store in the file tag.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTagAsDateTime Method (CBMemoryDrive Component)

This method attaches a DateTime-typed file tag to the specified vault item.

Syntax

procedure SetFileTagAsDateTime(FileName: String; TagName: String; Value: TDateTime);

Remarks

This method attaches a DateTime-typed file tag to the vault item (e.g., file, directory, or alternate stream) specified by FileTag using the specified TagName. If a typed file tag with the specified TagName is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The Value parameter specifies the DateTime value to store in the file tag, which must be specified in UTC.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTagAsNumber Method (CBMemoryDrive Component)

This method attaches a Number-typed file tag to the specified vault item.

Syntax

procedure SetFileTagAsNumber(FileName: String; TagName: String; Value: Int64);

Remarks

This method attaches a Number-typed file tag to the vault item (e.g., file, directory, or alternate stream) specified by FileTag using the specified TagName. If a typed file tag with the specified TagName is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The Value parameter specifies the Number value to store in the file tag.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetFileTagAsString Method (CBMemoryDrive Component)

This method attaches a String-typed file tag to the specified vault item.

Syntax

procedure SetFileTagAsString(FileName: String; TagName: String; Value: String);

Remarks

This method attaches a String-typed file tag to the vault item (e.g., file, directory, or alternate stream) specified by FileTag using the specified TagName. If a typed file tag with the specified TagName is already attached to the specified vault item, it is replaced.

The value passed for FileName must be a vault-local absolute path. The value passed for TagName may be up to 4095 characters in length (not including the null terminator).

The Value parameter specifies the UTF-16LE String value to store in the file tag; it may be up to 65529 - (name_length * 2) bytes in length (where name_length is measured in characters), including null terminators for both the String value and the name.

Please refer to the File Tags topic for more information.

Note: This method can be called only when Active is True, and it cannot be called within events.

SetIcon Method (CBMemoryDrive Component)

Selects a registered overlay icon for display on the virtual drive in Windows Explorer (Windows only).

Syntax

procedure SetIcon(IconId: String);

Remarks

This method selects the overlay icon specified by IconId for display, causing it to be shown on the virtual drive in Windows Explorer. The desired icon must have already been registered using the RegisterIcon method, and the value passed for IconId must match the one passed RegisterIcon at that time.

To switch to a different overlay icon later, call this method again with a different IconId. To reset the virtual drive's icon back to its default state (i.e., displayed without any overlay icons), call the ResetIcon method. Please refer to the Custom Drive Icons topic for more information.

The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.

Note: This method can be called only after creating a virtual drive, and it cannot be called within events. Also, note that the effects of this method only last until the virtual drive is destroyed; applications that always want to have some overlay icon displayed must call this method each time the virtual drive is created.

ShutdownSystem Method (CBMemoryDrive Component)

Shuts down or reboots the operating system.

Syntax

function ShutdownSystem(ShutdownPrompt: String; Timeout: Integer; ForceCloseApps: Boolean; Reboot: Boolean): Boolean;

Remarks

This method shuts down or (if Reboot is True) reboots the operating system. If the appropriate privileges cannot be obtained, or if the InitiateSystemShutdown system call returns False, then this method will return False; otherwise, it returns True. This method can be used if the installation or uninstallation function requires the system to be rebooted in order to complete.

ShutdownPrompt, if non-empty, specifies a message that the OS should display to the user for Timeout seconds. If empty string is passed for ShutdownPrompt, no message is displayed and the Timeout parameter's value is ignored.

ForceCloseApps specifies whether the OS should forcefully close all applications. Please keep in mind that forceful closing of applications with unsaved data can lead to data loss.

Reboot specifies whether the OS should reboot (True) or just shut down (False).

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter.

Note: This method cannot be called within events.

Uninstall Method (CBMemoryDrive Component)

Uninstalls the product's system drivers and/or helper DLL (Windows only).

Syntax

function Uninstall(CabFileName: String; ProductGUID: String; InstalledPath: String; Flags: Integer): Integer;

Remarks

This method is used to uninstall the product's various modules (i.e., the system drivers and Helper DLL). If the system must be rebooted to complete the uninstallation process, this method will return a non-zero value indicating which module(s) requested the reboot (see Install for possible values).

Important: To upgrade the product's modules, use only the Install method. Previously installed versions of the modules should not be uninstalled first. Calling the Install method will upgrade the previously installed version.

Please refer to the Driver Installation in Windows topic for more information.

The same values must be passed for the CabFileName, ProductGUID, and InstalledPath parameters as were passed when Install was called; please refer to its documentation for more information.

Flags specifies which versions of the product's modules should be uninstalled, and should be set by OR'ing together one or more of the following values:

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter.

This method requires administrative rights to execute successfully. If the user account of the process that calls this method doesn't have such rights, the call will fail with an ERROR_PRIVILEGE_NOT_HELD ($0522) error.

Note: This method cannot be called within events.

UnixTimeToFileTime Method (CBMemoryDrive Component)

This method converts the date/time in Unix format to the Windows FileTime format.

Syntax

function UnixTimeToFileTime(UnixTime: Int64; Nanoseconds: Integer): TDateTime;

Remarks

Use this method to convert the date/time in Unix format to the Windows FileTime format.

Pass the Unix time value to UnixTime and optionally pass the subsecond part of the time, expressed in nanoseconds, to the Nanoseconds parameter. If the subsecond part of the time is not available, set Nanoseconds to zero (0) value.

UnregisterIcon Method (CBMemoryDrive Component)

Unregisters an existing overlay icon (Windows only).

Syntax

function UnregisterIcon(ProductGUID: String; IconId: String): Boolean;

Remarks

This method unregisters the overlay icon identified by IconId. If the system must be rebooted to completely remove the icon, this method returns True, otherwise it returns False.

The same values must be passed for the ProductGUID and IconId parameters as were passed when RegisterIcon was called; please refer to its documentation, as well as the Custom Drive Icons topic, for more information.

This method is available in both the component API and the Installer DLL included with the product; please refer to the Driver Installation in Windows topic for more information about the latter. The Helper DLL must be installed in order for this method to function correctly. Applications can check to see whether the Helper DLL is installed using the GetModuleVersion method, and install it using the Install method if necessary.

This method requires administrative rights to execute successfully. If the user account of the process that calls this method doesn't have such rights, the call will fail with an ERROR_PRIVILEGE_NOT_HELD ($0522) error.

Note: This method cannot be called within events.

UpdateVaultEncryption Method (CBMemoryDrive Component)

This method encrypts, decrypts, or changes the encryption password of the vault.

Syntax

procedure UpdateVaultEncryption(Encryption: Integer; OldPassword: String; NewPassword: String);

Remarks

This method changes the encryption mode or password used to encrypt the vault.

The Encryption parameter specifies the new encryption mode to use. Valid values are as follows:

Applications that use custom encryption must implement at least the DataEncrypt and DataDecrypt events. Certain custom encryption modes may require that the HashCalculate or KeyDerive event be implemented as well. Please refer to the Encryption topic for more information.

The OldPassword parameter specifies the current encryption password, if applicable.

The NewPassword parameter specifies the new encryption password to use, if applicable.

Note: This method can be called only when Active is True, and it cannot be called within events.

Ejected Event (CBMemoryDrive Component)

Fires when the media and virtual drive have been ejected (Windows only).

Syntax

type TEjectedEvent = procedure (
  Sender: TObject;
  var ResultCode: Integer
) of Object;

property OnEjected: TEjectedEvent read FOnEjected write FOnEjected;

Remarks

This event fires when a user has ejected the media and virtual drive using the Eject command in Windows Explorer.

For ejection via the system notification area (tray) to work correctly, the StorageType property must be set to STGT_DISK_PNP, and the StorageCharacteristics property must include ejection-related flags.

This event is optional; it is provided to give applications a chance to, e.g., free up resources associated with the virtual drive. Since the virtual drive has already been destroyed by the time this event fires, applications must not call CloseVault (it is called automatically with its Force parameter set to True) .

The ResultCode parameter will always be initially set to the result of a storage deletion operation. The expected value is 0. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a non-zero value to report an appropriate error. Note that as ejection has already occured, this non-zero value will not have effect on the media's state. Please refer to the Error Reporting and Handling topic for more information.

Error Event (CBMemoryDrive Component)

This event fires if an unhandled error occurs during an event.

Syntax

type TErrorEvent = procedure (
  Sender: TObject;
  ErrorCode: Integer;
  const Description: String
) of Object;

property OnError: TErrorEvent read FOnError write FOnError;

Remarks

This event fires if an unhandled error occurs during another event. Developers can use this information to track down unhandled errors in an application's event handlers.

FileAccess Event (CBMemoryDrive Component)

Fires when the OS wants to create or open a file or directory.

Syntax

type TFileAccessEvent = procedure (
  Sender: TObject;
  const FileName: String;
  ExistingAttributes: Integer;
  DesiredAccess: Integer;
  Attributes: Integer;
  Options: Integer;
  ShareMode: Integer;
  var ResultCode: Integer
) of Object;

property OnFileAccess: TFileAccessEvent read FOnFileAccess write FOnFileAccess;

Remarks

This optional event fires when the OS wants to create or open the existing file or directory specified by FileName. It can be used to control and optionally restrict access to files and directories. The event fires when FireFileAccessEvent setting is enabled (by default, it is disabled for performance reasons).

This event also fires when the OS wants to create or open a named data stream in a file. Such requests are distinguished by the presence of a colon (:) in the FileName value; the text before the colon is the name of the file itself, and the text after the colon is the name of the stream to open.

The ExistingAttributes parameter contains the attributes of the file or directory being opened, if one already exists; otherwise, it contains 0. To determine whether the request is for a file or a directory, compare ExistingAttributes against the VAULT_FATTR_DIRECTORY or VAULT_FATTR_FILE constant respectively, like so: // Check whether the request is for a file or a directory. bool isDirectory = ExistingAttributes & CBFSVAULT_FATTR_DIRECTORY == CBFSVAULT_FATTR_DIRECTORY; bool isFile = ExistingAttributes & CBFSVAULT_FATTR_FILE == CBFSVAULT_FATTR_FILE;

The DesiredAccess parameter specifies the mode of access to the file or directory desired by the process that initiated the request. It can be one of the following values:

The Attributes parameter contains the value of Attributes, passed by the originator process; it may contain zero or more of the following attributes:

Windows: The Options parameter includes flags and options that are described in the CreateOptions parameter of the Native API's ZwCreateFile function. Most of those flags correspond to flags passed in the FlagsAndAttributes parameter of the Windows API's CreateFile function, but some flags are specific to Native API. If you need those flags, check both functions' descriptions.

Linux, macOS: this parameter is not used.

The ShareMode parameter specifies the access sharing mode desired by the process that initiated the request; it may contain zero or more of the following share mode flags:

The ResultCode parameter will always be 0 when the event is fired. Applications may perform the necessary access control using one of GetOriginator* methods, and set ResultCode to 0 to indicate that the file or directory may be opened, or to a system-specific error code to tell the OS about an error. Please refer to the Error Reporting and Handling topic for more information.

Note: an application may not access the drive and its contents from an event handler, as this will cause a deadlock.

FileAfterCopy Event (CBMemoryDrive Component)

This event fires after the file has been copied during file export/import operations.

Syntax

type TFileAfterCopyEvent = procedure (
  Sender: TObject;
  const SourcePath: String;
  const DestinationPath: String;
  Attributes: Integer;
  var ResultCode: Integer
) of Object;

property OnFileAfterCopy: TFileAfterCopyEvent read FOnFileAfterCopy write FOnFileAfterCopy;

Remarks

This event fires when the component is executing the CopyToVault or CopyFromVault method after the file specified by SourcePath has been copied to a file identified by DestinationPath.

For a directory, the event fires after the directory identified by SourcePath has been created as DestinationPath and all of the source directory's contents have been processed.

The event will fire only if the VAULT_CFF_FIRE_COPY_EVENTS flag is included in the Flags parameter of the CopyFromVault or CopyToVault method. Also, the event will not fire for the base directory that was passed to the CopyToVault or CopyFromVault method.

A process may check whether it was a file or directory copied by inspecting the value of the Attributes parameter, which contains the attributes of the file as a 32-bit integer. The attributes are composed of one or more of the following values:

To cancel further copying, return the VAULT_ERR_INTERRUPTED_BY_USER error code via ResultCode.

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource is not available or security checks failed), set it to a nonzero value to report an appropriate error. Please see the Error Reporting and Handling topic for more information.

Note: When a storage is opened concurrently in read-only mode by several applications using CBVaultDrive or CBMemoryDrive component, the event will fire only in the first application. To prevent such a situation, always open a vault in read-write mode.

FileBeforeCopy Event (CBMemoryDrive Component)

This event fires before the file is copied during file export/import operations.

Syntax

type TFileBeforeCopyEvent = procedure (
  Sender: TObject;
  const SourcePath: String;
  const DestinationPath: String;
  var Attributes: Integer;
  DestinationExists: Boolean;
  var Skip: Boolean;
  var ResultCode: Integer
) of Object;

property OnFileBeforeCopy: TFileBeforeCopyEvent read FOnFileBeforeCopy write FOnFileBeforeCopy;

Remarks

This event fires when the component is executing the CopyToVault or CopyFromVault method before the file specified by SourcePath is copied to a file identified by DestinationPath or before the directory identified by SourcePath is about to be created as DestinationPath.

This event will fire only if the VAULT_CFF_FIRE_COPY_EVENTS flag is included in the Flags parameter of the CopyFromVault or CopyToVault method. Also, the event will not fire for the base directory that was passed to the CopyToVault or CopyFromVault method.

A process may check whether it is a file or a directory being copied by inspecting the value of the Attributes parameter, which contains the attributes of the file as a 32-bit integer. The attributes are composed of one or more of the following values:

An event handler may change the following attributes: VAULT_FATTR_READONLY, VAULT_FATTR_ARCHIVE, VAULT_FATTR_HIDDEN, VAULT_FATTR_SYSTEM, VAULT_FATTR_TEMPORARY. When files are imported to the vault, an event handler may set user-defined flags that match the VAULT_FATTR_USER_DEFINED mask.

The DestinationExists flag indicates the presence of the file or directory at the moment when the event is fired.

Note: When copying the files from the vault, it is possible that a file gets created or deleted outside of the component; the value of this parameter may become inaccurate.

To skip the file, set the Skip parameter to true. When the file is skipped, FileAfterCopy does not fire.

To cancel copying, return the VAULT_ERR_INTERRUPTED_BY_USER error code via ResultCode.

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource is not available or security checks failed), set it to a nonzero value to report an appropriate error. Please see the Error Reporting and Handling topic for more information.

Note: When a storage is opened concurrently in read-only mode by several applications using CBVaultDrive or CBMemoryDrive component, the event will fire only in the first application. To prevent such a situation, always open a vault in read-write mode.

FilePasswordNeeded Event (CBMemoryDrive Component)

This event fires if a password is needed to open an encrypted file.

Syntax

type TFilePasswordNeededEvent = procedure (
  Sender: TObject;
  const FileName: String;
  var Password: String;
  var TTLInCache: Integer;
  var ResultCode: Integer
) of Object;

property OnFilePasswordNeeded: TFilePasswordNeededEvent read FOnFilePasswordNeeded write FOnFilePasswordNeeded;

Remarks

This event fires when the encrypted file specified by FileName is being opened if a valid password has not been provided (either directly, or via the DefaultFileAccessPassword property or CacheFilePassword method). This event will not fire if a valid password has already been provided, or if the file specified by FileName does not exist in the vault.

To allow access to the specified file, set the Password parameter to the correct password.

If an invalid password is provided by the event handler, the event will fire again.

To prevent access to the specified file or to stop being asked for a password in a loop, return the VAULT_ERR_INVALID_PASSWORD error code via ResultCode.

The TTLInCache parameter specifies time to seconds that the component keeps the password in the internal cache to reduce the number of requests for a password. The value of 0 tells the component to discard the password after the first use.

Note: This event can be fired on different threads, and possibly even on several threads concurrently. As an alternative to handling this event, applications can provide a default file encryption password using the DefaultFileAccessPassword property or can call the CacheFilePassword method (before a file is opened) to specify a one-time-use password.

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource is not available or security checks failed), set it to a nonzero value to report an appropriate error. Please see the Error Reporting and Handling topic for more information.

Note: When a storage is opened concurrently in read-only mode by several applications using CBVaultDrive or CBMemoryDrive component, the event will fire only in the first application. To prevent such a situation, always open a vault in read-write mode.

Progress Event (CBMemoryDrive Component)

This event fires to indicate the progress of long-running vault operations.

Syntax

type TProgressEvent = procedure (
  Sender: TObject;
  Operation: Integer;
  const FileName: String;
  Progress: Integer;
  Total: Integer;
  CanStop: Boolean;
  var Stop: Boolean
) of Object;

property OnProgress: TProgressEvent read FOnProgress write FOnProgress;

Remarks

This event fires anytime the component needs to report the progress of a long-running vault operation. Certain operations may cause this event to fire repeatedly.

The Operation parameter specifies which long-running operation caused this event to fire. Possible values are as follows:

When the operation is copying files from or to the vault, FileName contains the path of the source file being copied.

The Progress and Total parameters reflect the current and maximum progress values. Both will be 0 if the operation's progression cannot be determined.

The CanStop parameter indicates whether the application may interrupt the operation by setting the Stop parameter to True.

Note: Some operations can be interrupted only at certain points over the course of their lifetime.

Note: An application should not attempt to call component's methods from handlers of this event. Doing this is guaranteed to cause a deadlock.

Note: When a storage is opened concurrently in read-only mode by several applications using CBVaultDrive or CBMemoryDrive component, the event will fire only in the first application. To prevent such a situation, always open a vault in read-write mode.

MountingPoint Type

Represents a mounting point for the virtual drive.

Remarks

This type represents a mounting point for the virtual drive.

Fields

OpenFile Type

Represents an open filesystem object from the virtual drive.

Remarks

This type represents an open filesystem object (file, directory, etc.) from the virtual drive.

Fields

ProcessAccessRule Type

Represents an access rule granting or denying some process a specific access right.

Remarks

This type represents an access rule that grants or denies some process a specific access right.

Fields

CBFSStorageStream Type

Syntax

cbscore.TCBFSStorageStream

Remarks

The CBFSStorageStream type is returned by some of the CBMemoryDrive component's methods. All stream types in CBFS Storage share a common API, inherited from the System.Classes.TStream class, documented below.

Note that, for brevity, many of the properties and methods offered by System.Classes.TStream are not documented here; please refer to Embarcadero's documentation for more information.

property Position: Int64 read GetPosition write SetPosition;

property Size: Int64 read GetSize write SetSize64;

procedure Flush();

function Read(var Buffer; Count: Longint): Longint;

function Seek(const Offset: Int64; Origin: TSeekOrigin): Int64;

function Write(const Buffer; Count: Longint): Longint;

Config Settings (CBMemoryDrive Component)

CBMemoryDrive Config Settings

Trappable Errors (CBMemoryDrive Component)

CBMemoryDrive Errors

Special Use Errors