Delphi:Delphi使用FileExists函数检查文件是否存在，附演示程序源代码，因为只注重功能演示，所以程序还有很多需要完善的地方，文本框中的路径需要手功输入，有时间的可自己完善。

-Delphi: Delphi use the FileExists function to check whether a file exists, with a demo program source code, because only focus on functional demo, so there are many programs need improvement, Path text box needs to hand power input, there is time to improve yourself.