Re: How to use SetWindowsHookEx?

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#500

From: Darko Miletic
Date: Wed, 19 Mar 2008 14:29

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amol wrote:
> Hi there,
> 
> I am getting following error messages while using SetWindowsHookEx:
> 
> "cannot convert 'long (__stdcall *)(int,unsigned int,long)' 
> to 'int(__stdcall *)()' "
> 
> "Type mismatch in parameter 'lpfn' (wanted 'int(__stdcall *)()', got 'long(__stdcall *) (int,unsigned int,long)')"
> 
> 
> I am calling the "SetWindowsHookEx" as follow:
> 
> hook = SetWindowsHookEx(WH_KEYBOARD,KeyboardProc,hinstance,NULL);
> LRESULT CALLBACK KeyboardProc(int ncode,WPARAM wparam,LPARAM lparam)
> {
>   return ( CallNextHookEx(hook,ncode,wparam,lparam) );
> }

You must cast the function pointer to HOOKPROC like this:

hook = SetWindowsHookEx(  WH_KEYBOARD
                         , reinterpret_cast<HOOKPROC>(KeyboardProc)
                         , hinstance
                         , 0U);

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Date: Wed, 19 Mar 2008 11:29:00 -0300
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