６ 调用的函数被拦截进入跟踪程序：设置好了的跟踪程序截获了该次调用。 ８ 退出跟踪程序，返回到鼠标钩子MouseProc；-6 function call is intercepted enter tracking program: set up a tracking program intercepts the invocation. 8 exit tracking program and return to the mouse hook MouseProc