Creating custom message types in win32?

Question

Is there a way to define and send custom message types in Win32, to be caught by your Main message handler? For example, my main message handler captures messages such as WM_PAI

Answer 1

• If you created the window class, you can use the WM_USER range (or WM_APP)
• If it is not your class, you can use WM_APP
• If you want to broadcast the message to every top level window, register your own global message with RegisterWindowMessage