虽然能用DLL实现的功能都可以用COM来替代，但DLL的优点确实不少，它更容易创建。本文将讨论如何利用VC MFC来创建不同类型的DLL，以及如何使用他们-Although the DLL can be used to achieve the functions can be used to replace COM, but the DLL is indeed a lot of advantages, it is more easy to create. This article will discuss how to use VC MFC to create different types of DLL, and how to use them