[Programming Visual C++]Chapter Six-Setting the Color for the Dialog Background and for Controls

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于 2005-08-03 13:12:00 发布

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博客介绍了Win32中WM_CTLCOLOR消息被特定控制消息替代，MFC和ClassWizard会无形处理这些消息，虽使调试变复杂，但利于编写可移植代码，还可使用ON_MESSAGE宏映射真实Win32消息。若对话框类未映射该消息，框架会将消息反射回控件。

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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.