学习Windows动态链接库（DLL）的基本概念和知识 学习和掌握WIN32 DLL和MFC DLL的建立方式 学习和掌握隐式和显式加载DLL的使用方法 -Learning Windows dynamic link library (DLL) of the basic concepts and knowledge to learn and master the WIN32 DLL and MFC DLL is created by learning and mastering the