钩子DLL程序示例，指导初学者使用动态连接库-Hook DLL sample programs using dynamic link library guide for beginners

代码是用来实现在视图中使用CDC进行绘图操作的代码,给力，适用于初学者学习与指导-The code is used for drawing operations in view CDC code, suitable for beginners to learn with the guidance force