WNDPROC conversion

How do you set a class member function to be a WNDPROC? I am creating my own custom class to represent a window, and I have the following in my constructor:

Code:

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WNDCLASSEX CanvasClass;
...
CanvasClass.lpfnWndProc = &TCanvasWindow::WndProc;

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However I get an error:

converting from `LRESULT (TCanvasWindow::*)(HWND__ *, unsigned int, unsigned int, long int)' to `LRESULT (*)(HWND__ *, unsigned int, unsigned int, long int)'

I have tried casting the function pointer to WNDPROC (the type of lpfnWndProc) but this doesn't seem to work either.

I am using Dev-C++ and MinGW on Windows XP Professional.

Please help!

TCanvasWindow::WndProc must be declared as static.

In addition to Tonto's fine suggestion you should search this board as there have been many discussions of this in the past which you may find of some interest.

Quote:

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Originally Posted by Ken Fitlike

In addition to Tonto's fine suggestion you should search this board as there have been many discussions of this in the past which you may find of some interest.

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Yeah thanks. I did actually search the board before I posted, but after reading your message I searched it again and found a couple of topics. Now I have a good window procedure running with "this" passed as the last argument of CreateWindowEx, a global static window procedure, GetWindowLongPtr and SetWindowLongPtr working... Thank you for your help.

>> I am using Dev-C++ and MinGW on Windows XP Professional.

Vote on the poll and you may not have to say that more than once. :)
But for now, putting it in your sig would be good.

MFC accomplished this by having a function called GetWindowHandlePermananet() which takes and HWND and returns a CWnd. They then call WndProc with the CWnd pointer.