该程序虽然只用了几个shellai函数，但是它涉及到了在Delphi中对DLL的引用、钩子实现、对指示区的操作、用户定义消息的处理、文件的读写等比较重要的内容，我相信这篇文章能对许多Delphi的初学者有所帮助。-Although the program used several shellai function, but it involves reference to the DLL in Delphi, the achievement of the hook, to indicate the operation, the user define the message processing, file read and write more important content, I believe that this article can help many of the Delphi beginners.