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	[x] Attachment Details

Getting handle to current method in dll

Zones: Microsoft Visual C++.Net, Windows Programming, Microsoft Visual C++

Tags: Microsoft, Win32, xp vista, c++

I don't know much about Windows programming and I have a DLL issue. I'm dealing with global hooks. I apparently need to have the global hook callback (CallWndProc in my case) in a DLL so that it can be called by any thread in the desktop. In order to pass the hook on nicely to other handlers, I'm supposed to call CallNextHookEx from within CallWndProc. For convenience, I would also like to put the functions for setting and releasing the hook in the DLL.

My problem is that CallNextHookEx requires a handle to the function it's being called from and I don't know the best way to provide that information from within the DLL since it's not a parameter to the callback. Is there some way I can call GetProcAddress with a handle to the DLL it's running inside? BTW, I realize that this parameter is ignored in XP+, but I'd still like to know how to do it.

         
             DECLDIR LRESULT CALLBACK CallWndProc(int nCode, WPARAM wParam, LPARAM lParam)
   {
	   /* how do I get a handle to this instance of CallWndProc?
		if(nCode < 0)
			return CallNextHookEx(HandleToCallback, nCode, wParam, lParam);
		*/
 
// message processing stuff below here
   }

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9.5

Question Stats

Zone: Programming

Question Asked By: jjharr

Solution Provided By: DanRollins

Participating Experts: 1

Solution Grade: A

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