wince下检测SD设备插入拔出

下面是一段以SD卡插入和拔出，wince系统或者该动作。 该消息是由设备管理器发出的。

DWORD WINAPI Detect_Thread(LPVOID Lparam)
{
HANDLE h_file;
DWORD   dwFlags, dwSize;
MSGQUEUEOPTIONS msgopts;
HANDLE   rghWaits=NULL;
HANDLE   hReg;
BYTE   msgBuf[MAX_DEVCLASS_NAMELEN*2];
    DEVDETAIL  *pd = (DEVDETAIL*)msgBuf;
UINT c_count=0;
memset(&msgopts, 0, sizeof(msgopts));
    msgopts.dwSize = sizeof(msgopts);
    msgopts.dwFlags = 0;
    msgopts.dwMaxMessages = 0;
    msgopts.cbMaxMessage = MAX_DEVCLASS_NAMELEN;
    msgopts.bReadAccess = TRUE;

TCHAR SourceDir2[256];
TCHAR DestDir1[256];
ZeroMemory(SourceDir2,256);
ZeroMemory(DestDir1,256);
rghWaits = CreateMsgQueue(NULL, &msgopts);
hReg = RequestDeviceNotifications(&BLOCK_DRIVER_GUID, rghWaits, TRUE);
while(1){
  DWORD dwWaitCode;
        dwWaitCode = WaitForSingleObject(rghWaits,0);
  if ( dwWaitCode == WAIT_OBJECT_0 )
  {
   if (ReadMsgQueue(rghWaits, pd, MAX_DEVCLASS_NAMELEN, &dwSize, INFINITE, &dwFlags))
   {
    if ( memcmp(&pd->guidDevClass, &BLOCK_DRIVER_GUID, sizeof(GUID)) == 0 )
    {
     if (pd->fAttached)
     {
                  RETAILMSG(1,(TEXT("SD Card is insert\n")));
                  Sleep(2000);
     }
     else//SD
     {
                     RETAILMSG(1,(TEXT("SD Card Reject\n")));
     }
    }
    memset(msgBuf, 0, MAX_DEVCLASS_NAMELEN*2);
   }
  }
  Sleep(1000);
}
StopDeviceNotifications(hReg);
CloseHandle(rghWaits);
return 0;
}