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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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LocalUnlock
The LocalUnlock function decrements the lock count associated with a memory object that was
allocated with the LMEM_MOVEABLE flag. This function has no effect on memory
objects allocated with the LMEM_FIXED flag.
BOOL LocalUnlock(
HLOCAL hMem
| // handle of local memory object
| );
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Parameters
hMem
Identifies the local memory object. This handle is returned by either the LocalAlloc or LocalReAlloc function.
Return Values
If the memory object is still locked after decrementing the lock count, the
return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError. If GetLastError returns NO_ERROR, the memory object is unlocked.
Remarks
The internal data structures for each memory object include a lock count that
is initially zero. For movable memory objects, the LocalLock function increments the count by one, and LocalUnlock decrements the count by one. For each call that a process makes to LocalLock for an object, it must eventually call LocalUnlock. Locked memory will not be moved or discarded unless the memory object is
reallocated by using the LocalReAlloc function. The memory block of a locked memory object remains locked until its
lock count is decremented to zero, at which time it can be moved or discarded.
If the memory object is already unlocked, LocalUnlock returns FALSE and GetLastError reports ERROR_NOT_LOCKED. Memory objects allocated with the LMEM_FIXED flag
always have a lock count of zero and cause the ERROR_NOT_LOCKED error.
A process should not rely on the return value to determine the number of times
it must subsequently call LocalUnlock for the memory block.
See Also
LocalAlloc, LocalFlags, LocalLock, LocalReAlloc
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