ReadFile Event

Fires when the OS needs to read data from an open file.

Syntax

// CBFSReadFileEventArgs carries the CBFS ReadFile event's parameters.
type CBFSReadFileEventArgs struct {...}

func (args *CBFSReadFileEventArgs) FileName() string
func (args *CBFSReadFileEventArgs) Position() int64
func (args *CBFSReadFileEventArgs) Buffer() []byte
func (args *CBFSReadFileEventArgs) SetBuffer(value []byte)
func (args *CBFSReadFileEventArgs) BytesToRead() int64
func (args *CBFSReadFileEventArgs) BytesRead() int64
func (args *CBFSReadFileEventArgs) SetBytesRead(value int64)
func (args *CBFSReadFileEventArgs) HandleInfo() int64
func (args *CBFSReadFileEventArgs) FileContext() int64
func (args *CBFSReadFileEventArgs) SetFileContext(value int64)
func (args *CBFSReadFileEventArgs) HandleContext() int64
func (args *CBFSReadFileEventArgs) SetHandleContext(value int64)
func (args *CBFSReadFileEventArgs) ResultCode() int32
func (args *CBFSReadFileEventArgs) SetResultCode(value int32)

// CBFSReadFileEvent defines the signature of the CBFS ReadFile event's handler function.
type CBFSReadFileEvent func(sender *CBFS, args *CBFSReadFileEventArgs)

func (obj *CBFS) GetOnReadFileHandler() CBFSReadFileEvent
func (obj *CBFS) SetOnReadFileHandler(handlerFunc CBFSReadFileEvent)

Remarks

This event fires when the OS needs to read data from the already-open file specified by FileName.

To handle this event properly, applications should read BytesToRead bytes of data from the specified file into the memory region pointed to by Buffer. Reading must begin at the specified Position in the file, and when reading is complete, applications must set BytesRead to reflect the actual number of bytes copied into Buffer. Applications must not attempt to copy more than BytesToRead bytes of data into Buffer.

Please refer to the Buffer Parameters topic for more information on how to work with memory buffer event parameters.

Note: While it is technically possible for an application to return fewer than BytesToRead bytes of data, doing so is abnormal, and should be avoided. Most processes treat read requests as "all or nothing", so returning less data than requested is likely to cause an ungraceful failure.

The HandleInfo parameter carries a handle to an object with information about the file handle. While within the event handler, it can be used to call any of the following methods: GetHandleCreatorProcessId, GetHandleCreatorProcessName, GetHandleCreatorThreadId, or GetHandleCreatorToken. (This parameter may be absent, in which case it will be 0.)

The FileContext and HandleContext parameters are placeholders for application-defined data associated with the file and specific handle, respectively. Please refer to the Contexts topic for more information. (HandleContext may be absent, in which case it will be nil.)

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 isn't available, security checks failed, etc.), set it to a non-zero value to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.

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CBFS Connect 2020 Go Edition - Version 20.0 [Build 8348]