现在开始定义框架类，它代表应用程序中的主窗口。
Now, define a frame class, which will represent the main window of your application.
SDI应用的主框架窗口的基类。也是所有其它框架窗口类的基类。
The base class for an SDI application's main frame window. Also the base class for all other frame window classes.
SDI应用的主框架窗口的基类。也是所有其它框架窗口类的基类。
The base class for an SDI application's main frame window. Also the base class for all other frame window classes.
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