AfterGetFileSizes Event

Fires after a file's size information is retrieved.


virtual int FireAfterGetFileSizes(CBFilterAfterGetFileSizesEventParams *e);
typedef struct {
const char *FileName;
int64 *pSize;
int64 *pAllocationSize;
int Status;
void *FileContext;
void *HandleContext;
int ResultCode; int reserved; } CBFilterAfterGetFileSizesEventParams;
virtual INT FireAfterGetFileSizes(CBFilterAfterGetFileSizesEventParams *e);
typedef struct {
LONG64 *pSize;
LONG64 *pAllocationSize;
INT Status;
LPVOID FileContext;
LPVOID HandleContext;
INT ResultCode; INT reserved; } CBFilterAfterGetFileSizesEventParams;


This event fires after size information is retrieved for the file specified by FileName.

Applications that intend to modify a file's contents should use this event to modify the file's actual size and/or allocation size as necessary. Applications that make use of virtual files should use this event to report virtual files' sizes.

Applications only need to handle this event if they've added a standard filter rule that includes the FS_CE_AFTER_GET_SIZES flag.

The Size parameter specifies the actual size of the file, in bytes.

The AllocationSize parameter specifies the amount of space allocated for the file, in bytes.

The Status parameter contains an NT status code that indicates the outcome of the operation; 0 indicates success. To convert this value to a Win32 error code, call the NtStatusToWin32Error method. Please note that this event won't fire for failed requests unless the ProcessFailedRequests property is enabled. Applications may change this parameter's value if they want a different NT status code to be returned.

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.

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.

This event is fired synchronously; please refer to the Event Types topic for more information.

Copyright (c) 2021 Callback Technologies, Inc. - All rights reserved.
CBFS Filter 2020 C++ Edition - Version 20.0 [Build 7836]