演示如何捕获系统设备变更消息，如U盘的插入等

使用DeviceIoControl控制光驱是否可以打开（达到按前面板上的按钮打不开光驱的目的，或者说锁定光驱），还可以让光驱盘符不可见。-Use DeviceIoControl control can open the drive (by front panel buttons to open The purpose of CD-ROM, CD-ROM or locked), you can also make CD-ROM drive is not visible.

vc写的一个检测可移动设备插拔的小程序-vc wrote a test plug may be a small program for mobile devices

实现u盘检测和自动卸载，由系统消息devicechange来触发事件-U disk to achieve detection and automatic unloading, by the system to trigger events news “devicechange”