源码说明：钩子能截获系统并得理发送给其它应用程序的消息，能完成一般程序无法完成的功能。掌握钩子的编程方法是很有必要的 -Source Descr iption: hook to intercept the system and may be sent to other applications Barber news, the general procedure to complete the function can not be completed. Grasp the hook of