Visual C++应用程序有四项主要基本知识：创建一个窗口、了解其他的M F C类、把消息

发送到一个窗口和在一个窗口内绘图。当然还有其他一些基本知识，我们也将在涉及时适当

地进行讨论。不过本部分将讨论以下四项基本知识。-Visual C++ applications, there are four main basic knowledge of: creating a window to understand the other MFC class to send messages to a window and a window in the drawing. Of course there are other basics, we will also be involved in discussions when appropriate. However, this section will discuss the four basic knowledge.