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CallNextHookEx info  Overview  Group

The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain. A hook procedure can call this function either before or after processing the hook information.

LRESULT CallNextHookEx(

    HHOOK hhk,

// handle to current hook

    int nCode,

// hook code passed to hook procedure

    WPARAM wParam,

// value passed to hook procedure

    LPARAM lParam 

// value passed to hook procedure

   );

Parameters

hhk
Identifies the current hook. An application receives this handle as a result of a previous call to the SetWindowsHookEx function.
nCode
Specifies the hook code passed to the current hook procedure. The next hook procedure uses this code to determine how to process the hook information.
wParam
Specifies the wParam value passed to the current hook procedure. The meaning of this parameter depends on the type of hook associated with the current hook chain.
lParam
Specifies the lParam value passed to the current hook procedure. The meaning of this parameter depends on the type of hook associated with the current hook chain.

Return Values

The return value is the value returned by the next hook procedure in the chain. The current hook procedure must also return this value. The meaning of the return value depends on the hook type. For more information, see the descriptions of the individual hook procedures.

Remarks

Hook procedures are installed in chains for particular hook types. CallNextHookEx calls the next hook in the chain.

Calling CallNextHookEx is optional, but it is highly recommended; otherwise, other applications that have installed hooks will not receive hook notifications and may behave incorrectly as a result. You should call CallNextHookEx unless you absolutely need to prevent the notification from being seen by other applications.

See Also

SetWindowsHookEx, UnhookWindowsHookEx

See also:


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