Mapping Messages to Functions
The Class Wizard enables you to bind message handlers (member functions of MFC user-interface classes) to the messages generated by your application's resources. They use MFC message maps to create the binding.
When you use Class View to create a new class derived from one of the framework classes, it automatically places a complete and functional class in the header (.h) and implementation (.cpp) files that you specify.
Note
To add a new class that does not handle messages, create the class directly in the text editor.
To define or remove a message handler using the Class Wizard
In Class View, right-click the class.
In the context menu, choose Class Wizard.
See also
MFC Message Handler
Adding Functionality with Code Wizards
Adding a Class
Adding a Member Function
Adding a Member Variable
Overriding a Virtual Function
Navigating the Class Structure