说明：  用WinInet开发Internet客户端应用指南---为了开发Internet客户端程序。MFC类库提供了专门的 Win32 Internet 扩展接口，也就是WinInet。MFC将WinInet封装在一个标准的、易于使用的类集合中。在编写WinInet客户端程序时,你既可以直接调用 Win32函数，也可以使用WinInet类库。
(Development of Internet use WinInet client application--- in order to guide the development of Internet client program. MFC class library provides a specialized interface Win32 Internet expansion, that is, WinInet. MFC will WinInet is packaged in a standard, easy-to-use category of the collection. In the preparation of WinInet client program, you can directly call the Win32 function, can also use the WinInet library.)