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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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LockFileEx
The LockFileEx function locks a byte range within an open file for shared or exclusive
access.
BOOL LockFileEx(
HANDLE hFile,
| // handle of file to lock
| DWORD dwFlags,
| // functional behavior modification flags
| DWORD dwReserved,
| // reserved, must be set to zero
| DWORD nNumberOfBytesToLockLow,
| // low-order 32 bits of length to lock
| DWORD nNumberOfBytesToLockHigh,
| // high-order 32 bits of length to lock
| LPOVERLAPPED lpOverlapped
| // addr. of structure with lock region start offset
| );
|
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Parameters
hFile
Identifies an open handle to a file that is to have a range of bytes locked
for shared or exclusive access. The handle must have been created with either
GENERIC_READ or GENERIC_WRITE access to the file.
dwFlags
Specifies flags that modify the behavior of this function. This parameter may
be one or more of the following values:
Value
| Meaning
| LOCKFILE_FAIL_IMMEDIATELY
| If this value is specified, the function returns immediately if it is unable
to acquire the requested lock. Otherwise, it waits.
| LOCKFILE_EXCLUSIVE_LOCK
| If this value is specified, the function requests an exclusive lock.
Otherwise, it requests a shared lock.
|
dwReserved
Reserved parameter; must be set to zero.
nNumberOfBytesToLockLow
Specifies the low-order 32 bits of the length of the byte range to lock.
nNumberOfBytesToLockHigh
Specifies the high-order 32 bits of the length of the byte range to lock.
lpOverlapped
Points to an OVERLAPPED structure that the function uses with the locking request. This structure,
which is required, contains the file offset of the beginning of the lock range.
Return Values
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.
Remarks
Locking a region of a file is used to acquire shared or exclusive access to
the specified region of the file. File locks are not inherited by a new process
during process creation.
Locking a portion of a file for exclusive access denies all other processes
both read and write access to the specified region of the file. Locking a region
that goes beyond the current end-of-file position is not an error.
Locking a portion of a file for shared access denies all processes write
access to the specified region of the file, including the process that first locks
the region. All processes can read the locked region.
If an exclusive lock is requested for a range of a file that already has a
shared or exclusive lock, this call waits until the lock is granted, unless the
LOCKFILE_FAIL_IMMEDIATELY flag is specified.
Locks may not overlap an existing locked region of the file.
See Also
CreateFile, LockFile, OVERLAPPED, UnlockFile, UnlockFileEx
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