参考MSDN例子：Detecting Media Insertion or Removal
响应WM_DEVICECHANGE 消息：
BOOL OnDeviceChange( UINT nEventType, DWORD dwData )
{
PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)dwData; // struct transform
PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
switch (nEventType)
{
case DBT_DEVNODES_CHANGED:
...
break;
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）case DBT_DEVICEARRIVAL: // device arrival
if(GetDriveType(UDriveName)==DRIVE_REMOVABLE)
{
........
}
else
{
......
}
break;
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）case DBT_DEVICEREMOVECOMPLETE : // remove device
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）........
break;
}
return TRUE;
}
