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4/8/2010

This function is a prototype to be implemented by the file system driver (FSD) and used by Lock Manager to return the lock state of the specified file. This function must be called to exit the file lock state's critical section.

Syntax


typedef BOOL (PRELEASEFILELOCKSTATE)( DWORD dwFile, PFILELOCKSTATE ppFileLockState );

Parameters

dwFile: Specifies the file.

ppFileLockState: Pointer to a FILELOCKSTATEstructure associated with the file referenced by dwFile.

Return Value

TRUE indicates that the file is locked.

Remarks

This is a function prototype to allow passing functions as parameters. An OEM must implement functions conforming to this type definition if using the FSDMGR_AcquireFileLockand the FSDMGR_CloseFileLockStatemacros from the MyFSD_LockFileExand the MyFSD_UnLockFileExfunctions.

The following code example shows a simple implementation:

	Copy Code
BOOL MyAcquireFileLockState(DWORD dwPfh, PFILELOCKSTATE ppFileLockState) { PFILE pFileHandle = (PFILE)dwPfh; PINTERNALFILE pFile = pFileHandle->pInternalFile; if (NULL == pFile->FileLockState.lpcs) { return FALSE; } // Acquire file lock state; exit in MyReleaseFileLockState. EnterCriticalSection(pFile->FileLockState.lpcs); // Obtain file position (64-bit offsets not supported). pFile->FileLockState.dwPosLow = pFileHandle->dwCurrentFileOffset; pFile->FileLockState.dwPosHigh = 0; // Obtain create access. pFile->FileLockState.dwAccess = pFileHandle->dwAccessMode; // Return file lock container. ppFileLockState = &pFile->FileLockState; return TRUE; }

Copy Code

BOOL MyAcquireFileLockState(DWORD dwPfh, PFILELOCKSTATE
*ppFileLockState)
{
   PFILE pFileHandle = (PFILE)dwPfh;
   PINTERNALFILE pFile = pFileHandle->pInternalFile;
   if (NULL == pFile->FileLockState.lpcs) 
   {
	return FALSE;
   }
   // Acquire file lock state; exit in MyReleaseFileLockState.
   EnterCriticalSection(pFile->FileLockState.lpcs);
   // Obtain file position (64-bit offsets not supported).
   pFile->FileLockState.dwPosLow =
pFileHandle->dwCurrentFileOffset;
   pFile->FileLockState.dwPosHigh = 0;
   // Obtain create access.
   pFile->FileLockState.dwAccess = pFileHandle->dwAccessMode;
   // Return file lock container.
   *ppFileLockState = &pFile->FileLockState;
   return TRUE;
}

Requirements

Header	lockmgrtypes.h
Library	Fsdmgr.lib
Windows Embedded CE	Windows CE 5.0 and later
Windows Mobile	Windows Mobile Version 5.0 and later

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