[Programming Visual C++]Chapter SixSetting the Color for the Dialog Background and for Controls
For Win32 Programmers
Actually, Win32 no longer has a WM_CTLCOLOR message . It was replaced by control-specific messages such as WM_CTLCOLORBTN, WM_CTLCOLORDLG , and so on. MFC and ClassWizard process these messages invisibly, so your programs look as though they're mapping the old 16-bit WM_CTLCOLOR messages . This trick makes debugging more complex, but it makes portable code easier to write. Another option would be to use the ON_MESSAGE macro to map the real Win32 messages.
If your dialog class (or other MFC window class) doesn't map the WM_CTLCOLOR message, the framework reflects the message back to the control. When you study window subclassing in Chapter 16 , you'll learn how to write your own control window classes that can process these reflected messages.
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