Re: Callback function as method class

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#9469

From: Eelke Klein
Date: Fri, 09 Jul 2004 07:22

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Sam wrote:
> I need to drop this callback function as a method of a custom C++ class:
> LRESULT CALLBACK NewWindowProc(HWND hWnd, UINT msg, WPARAM w, LPARAM l)
>     {
>         ...
>         return CallWindowProc(OldProc, hWnd, msg, w, l);
>     }
> The compiler refused. It seems that a class can't has a callback as method,
> that is right ?
Yes

Windows callback functions should be normal functions or static member 
functions. Normal member functions won't work because they have an 
additional hidden parameter which is the object on which they are called.

Eelke

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