卸载钩子 UnhookWindowsHookEx

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.