UnhookWindowsHookEx function

Removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.

Syntax


BOOL WINAPI UnhookWindowsHookEx(
  _In_  HHOOK hhk
);

Parameters

hhk [in]

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:

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

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

See also

Reference
SetWindowsHookEx
Conceptual
Hooks

 

 

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