本源码演示如何利用VC++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，以及如何直接利用对话框控件类操纵对话框控件（发送消息和直接调用成员函数）、如何在程序运行时产生和销毁控件。对话框控件的几种操作方式的优劣比较分析。

-Dialog box user interface program written in the data member connected to the dialog control and its implementation mechanism and how to control the dialog box associated with the control class, the source demonstrates how to use the class member functions of VC++ dialog to send a message to the control and access to the dialog box control of the class pointer, and control how the direct use of the dialog control class to manipulate the dialog box controls (to send messages and direct calls to member functions), and how the program is running and destruction. The pros and cons of several modes of operation for the dialog control. How to shrink and expand the part of the dialog box. How to make a text box on the dialog box to get the focus immediately after the program starts, and how to use SetWindowLong to change the window callback function, change the default text box Enter approach demonstrated. Another by a carriage return in the multiple input text box one by one down pass focus