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You can use ClassView, WizardBar, or ClassWizard to add a message handler (a member function that handles Windows messages) to a class, and map Windows messages to the message handler. You can also quickly add a message handler for any dialog box control.
ClassWizard and WizardBar let you browse the messages associated with user-interface objects in your project. Both tools automatically update the message-dispatch table, or message map, and your class header file when you use them to define message-handling functions.
Note Adding a message handler to an ATL class is performed in the same way that you add a message handler to an MFC class, however some results may vary. For more information, see the topic Adding a Message Handler to an ATL Object
Add a message handler with ClassView or WizardBar
Add a message handler with ClassWizard
Quickly add a message handler for a control
Add a message handler for an ATL control
See Also Adding a Class, Adding a Member Function, Adding a Member Variable, Overriding a Virtual Function, Deleting a Member Function, Navigating the Class Structure