USB编程初识程序。能够实时识别U盘的插入拔出，光盘的放入弹出信息。代码清晰易懂。目前流行的USBport没有这个功能哦。-The USB programming acquaintance procedures. Real-time identification pull out the insert U disk, CD-ROM into the pop-up message. The code is clear and easy to understand. Popular USBport