该文档介绍了使用VC创建钩子程序来用来挂载最常用的通讯及时通讯工具MSN,帮助我们理解利用HOOK是怎么样将自己编写的DLL注入已经存在的程序空间中的.-This document describes the use of VC program to create hooks to mount the most commonly used instant messaging communication tool MSN, to help us understand how to use HOOK is to write your own DLL injection existing program space.