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List:       wine-devel
Subject:    Re: chained wndprocs?
From:       lawson_whitney () juno ! com
Date:       2000-11-29 10:38:38
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On Wed, 29 Nov 2000, Marcus Meissner wrote:

> >
> > Wine provides for a chain of wndproc's, but I can't see any provision
to
> > use any but the first.
>
> Huh? WINE does not chain wndprocs by itself. It is usually done by mfc
or
> the application itself.
>
> They query the old windowproc and set their own one.
>
> appWndProc(hwnd,uMsg,wParam,lParam) {
> 	switch (uMsg) {
> 	... do stuff for some messages ...
> 	default:
> 		return oldWndProc(hwnd,uMsg,wParam,lParam);
> 	}
> }
>
> where they do
> 	oldWndPorc=SetWindowLong(hwnd,GWL_WNDPROC,appWndProc);
> (the call returns the old value).
>
> The whole process is called 'subclassing' under windows I seem to
remember ;)
>
> Ciao, Marcus
>
Okay, thanks, that makes more sense of it.  Except that mfc _isn't_
calling the class wnd proc, at least not enough to touch a winedbg
breakpoint.  I don't know for sure this app would work in m$windows
either.

Lawson
---cut here




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