The UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
Syntax
BOOL UnhookWindowsHookEx(
HHOOK hhk
);
Parameters
- hhk
-
[in] Handle to the hook to be removed. This parameter is a hook handle obtained by a previous call to SetWindowsHookEx.
Return Value
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.
Example
For an example, see Monitoring System Events.
Function Information
| Minimum DLL Version | user32.dll |
|---|
| Header | Declared in Winuser.h, include Windows.h |
|---|
| Import library | User32.lib |
|---|
| Minimum operating systems |
Windows 95, Windows NT 3.1 |
|---|
| Unicode | Implemented as
Unicode version. |
|---|
See Also