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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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UnlockFile
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
| );
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Parameters
hFile
Identifies 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
Specifies the low-order word of the starting byte offset in the file where the
locked region begins.
dwFileOffsetHigh
Specifies the high-order word of the starting byte offset in the file where
the locked region begins.
nNumberOfBytesToUnlockLow
Specifies the low-order word of the length of the byte range to be unlocked.
nNumberOfBytesToUnlockHigh
Specifies the high-order word of the length of the byte range to be unlocked.
Return Values
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.
Remarks
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.
See Also
CreateFile, LockFile
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