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UnlockFile.md

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Function name : UnlockFile

Group: File Management - Library: kernel32

Unlocks a region in an open file. Unlocking a region enables other processes to access the region.

Code examples:

Locking and unlocking file of a VFP table

Declaration:

BOOL UnlockFile(
  HANDLE hFile,                    // handle to file
  DWORD dwFileOffsetLow,           // low-order word of start
  DWORD dwFileOffsetHigh,          // high-order word of start
  DWORD nNumberOfBytesToUnlockLow, // low-order word of length
  DWORD nNumberOfBytesToUnlockHigh // high-order word of length
);

FoxPro declaration:

DECLARE INTEGER UnlockFile IN kernel32;
	INTEGER hFile,;
	INTEGER dwFileOffsetLow,;
	INTEGER dwFileOffsetHigh,;
	INTEGER nNumberOfBytesToUnlockLow,;
	INTEGER nNumberOfBytesToUnlockHigh

Parameters:

hFile [in] Handle to a file that contains a region locked with LockFile. The file handle must have been created with either GENERIC_READ or GENERIC_WRITE access to the file.

dwFileOffsetLow [in] Specifies the low-order word of the starting byte offset in the file where the locked region begins.

dwFileOffsetHigh [in] Specifies the high-order word of the starting byte offset in the file where the locked region begins.

nNumberOfBytesToUnlockLow [in] Specifies the low-order word of the length of the byte range to be unlocked.

nNumberOfBytesToUnlockHigh [in] Specifies the high-order word of the length of the byte range to be unlocked.

Return value:

If the function succeeds, the return value is nonzero.