Question

This might be a dumb question, but can you register multiple WndProc functions in Win32? e.g. a framework catches some messages and my app is interested in other ones – how do I catch them without modifying the framework code?

Answer 1

If I understand your intention correctly, you can do that by setting a hook. Assuming you know the thread whose message loop you’d like to hook, you can do something along these lines (unchecked):

SetWindowsHookEx(WH_CALLWNDPROC, yourHOOKPROC, NULL, theThreadId);