The UnlockFile function unlocks a region in an open file. Unlocking a region enables other processes to access the region.
BOOL UnlockFile(
HANDLE hFile, |
// handle of file to unlock |
DWORD dwFileOffsetLow, |
// low-order word of lock region offset |
DWORD dwFileOffsetHigh, |
// high-order word of lock region offset |
DWORD nNumberOfBytesToUnlockLow, |
// low-order word of length to unlock |
DWORD nNumberOfBytesToUnlockHigh |
// high-order word of length to unlock |
); |
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Unlocking a region of a file releases a lock on the file. The region to unlock must correspond exactly to an existing locked region. For example, two adjacent regions of a file cannot be locked separately and then unlocked as a single region that spans both locked regions.
A process should not be terminated with a portion of a file locked and a file that has locked regions should not be closed.
This function works on a file allocation table (FAT) - based file system only if the operating system is running SHARE.EXE.
file: /Techref/os/win/api/win32/func/src/f89_9.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/8/17 12:23,
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