Possible to Superclass a Dialog Box in Win32?

Question

I'm using raw Win32 and C++ for a project. As I understand it, I am able to superclass Windows controls by retrieving the class information, replacing the procedure, then registering this as a new class and using it when creating a new window. Subclassing is done by replacing the window's procedure after the window is created. The advantage of superclassing is that you are able to process messages before CreateWindow() returns.

I'm looking to see if it's possible to superclass a dialog box created with CreateDialog() because I'd like to use a resource file for the dialog layout. The problem is that I don't know how I would provide my superclass when I create a dialog box. Is it even possible? Any idea how MFC handles this?

Answer 1

If you use an extended dialog box template to create your dialog, you can specify a custom window class as part of the DLGTEMPLATEEX definition.

The dialog manager will create and layout your dialog as normal, and call your window procedure for any dialog messages. You can use the DefDlgProc function to obtain default processing for any dialog messages you don't want to handle yourself.