这是一个全局鼠标钩子的应用，运行之后可以在桌面乱画直线，主要重点在于DLL的生成，钩子的应用-This is the application of a global mouse hook, run a straight line, after you can doodle on the desktop, the main focus lies in the generation of DLL, hook the application of

在vc＋＋环境下编写的直线段裁剪算法,编码方法不错的,可以参考-Written in vc++ environment straight line cutting algorithm, coding method is good, you can reference