这种程序实在是简单得不能再简单，网上随处可见，不过我既然写了一个，也放上来吧，附上源码。使用方法请查看压缩包中的Readme文件。 -this procedure is utterly simple, Internet can be seen everywhere, but since I was an also Fangshanglai bar, accompanied source. Please see use of compressed readme file.