UnhookWindowsHookEx function (winuser.h)
Removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
Syntax
BOOL UnhookWindowsHookEx(
[in] HHOOK hhk
);
Parameters
[in] hhk
Type: HHOOK
A handle to the hook to be removed. This parameter is a hook handle obtained by a previous call to SetWindowsHookEx.
Return value
Type: BOOL
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
The hook procedure can be in the state of being called by another thread even after UnhookWindowsHookEx returns. If the hook procedure is not being called concurrently, the hook procedure is removed immediately before UnhookWindowsHookEx returns.
Examples
For an example, see Monitoring System Events.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
| API set | ext-ms-win-ntuser-window-l1-1-0 (introduced in Windows 8) |
See also
Conceptual
Reference