This function moves the end-of-file position for the specified file in an installable file system to the current position of the file pointer. The application does not call this function directly. Instead, use the corresponding standard Win32 function SetEndOfFile. The file system driver (FSD) Manager determines the file system type and calls the MyFSD_SetEndOfFile implementation of the function.
At a Glance
| Header file: | Fsdmgr.h |
| Windows CE versions: | 2.10 and later |
Syntax
BOOL MyFSD_SetEndOfFile( PFILE pFile);
Parameters
pFile
Pointer to the value that the file system driver (FSD) passes to the FSDMGR_CreateFileHandle function when creating the file handle.
Return Values
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.
Remarks
An FSD exports this function if it wants to support the SetEndOfFile function. All FSD functions can be called reentryly, therefore, FSD developers must take this into account when developing an FSD.
The Fsdmgr component is a dynamic-link library (DLL) that manages all operating system interaction with installable files systems. Each installable file system requires an FSD, which is a DLL that exports an API needed to support an installable file system. The name of the DLL and the names of the functions it exports start with the name of the associated installable file system. For example, if the name of file system is MyFSD, then its DLL is MyFSD.dll and its exported functions are prefaced with MyFSD_*.
Fsdmgr provides services to FSDs. The FSDMGR_RegisterVolume, FSDMGR_CreateFileHandle, and FSDMGR_CreateSearchHandle functions record a DWORD of volume-specific data the FSD needs to keep associated with volume. This volume-specific data is passed as the first parameter of these three functions.
Applications that access an installable file system use standard Win32 functions. For example, when an application wants to create a folder on a device that contains an installable file system, it calls CreateDirectory. Fsdmgr recognizes that the path is to a device containing an installable file system and calls the appropriate function, which in the case of the FAT file system is FATFSD_CreateDirectoryW.That is, the application calls CreateDirectory, causing Fsdmgr to call FATFSD_CreateDirectoryW.
This function can be used to truncate or extend a file. If the file is extended, the contents of the file between the old EOF position and the new position are not defined.
See Also