对话框用户界面程序的编写。如何向对话框控件关联数据成员及其实现机理，如何利用对话框类的成员函数向控件发送消息和获取对话框控件的类指针。-Procedures for the preparation of the user interface dialog box. How to control the dialog box associated with the data members and its implementation mechanism of how to use the dia