封装了许多用的很多却又懒得复制、粘贴的东西.比如内存映射文件的完整封装、取得路径名、播放一个文件的声音，获得MAC, 硬盘序列号-Package but many do not bother with a lot of copy and paste things. Such as memory mapped file a complete package, get the path name, playing a sound file, get MAC, hard drive serial nu