The UnlockFileEx function unlocks a previously locked byte range in an open file.
BOOL UnlockFileEx(
HANDLE hFile, |
// handle of file to unlock |
DWORD dwReserved, |
// reserved, must be set to zero |
DWORD nNumberOfBytesToUnlockLow, |
// low order 32-bits of length to unlock |
DWORD nNumberOfBytesToUnlockHigh, |
// high order 32-bits of length to unlock |
LPOVERLAPPED lpOverlapped |
// addr. of struct. with unlock region start offset |
); |
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero or NULL. To get extended error information, call GetLastError.
Unlocking a region of a file releases a previously acquired lock on a file. The region to unlock must correspond exactly to an existing locked region. Two adjacent regions of a file can not be locked separately and then unlocked using a single region that spans both locked regions.
If a process terminates with a portion of a file locked or closes a file that has outstanding locks, the behavior is not specified.
CreateFile, LockFile, LockFileEx, OVERLAPPED, UnlockFile
file: /Techref/os/win/api/win32/func/src/f89_10.htm, 3KB, , updated: 2000/4/7 11:19, local time: 2024/11/29 22:20,
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