QT实现U盘监控

目前实现U盘监控，插入U盘，会提示，拔出U盘也会

.h文件
protected:


   // char FirstDriveFromMask (ULONG unitmask);
    bool nativeEvent(const QByteArray & eventType, void * message, long*result);

.cpp文件
//实现U盘监控

char  FirstDriveFromMask( ULONG unitmask)
{
    char i;
    for (i = 0; i < 26; ++i)
    {
        if (unitmask & 0x1)
            break;
        unitmask = unitmask >> 1;
    }
   //qDebug() << "sss";
    return (i + 'A');
}
bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
    MSG* msg = reinterpret_cast<MSG*>(message);
    int msgType = msg->message;
    if(msgType==WM_DEVICECHANGE)
    {
        PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam;
        switch (msg->wParam) {
        case DBT_DEVICEARRIVAL:

            if(lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
            {
                PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
                if(lpdbv->dbcv_flags ==0)
                {
                    QString USBDisk = QString(FirstDriveFromMask(lpdbv ->dbcv_unitmask));
                     number=1;
                   // keyHook =SetWindowsHookEx( WH_KEYBOARD_LL,keyProc,Boardhinstance,0);
                    qDebug() << "USB_Arrived and The USBDisk is: "<<USBDisk ;

                }
            }
            break;
        case DBT_DEVICEREMOVECOMPLETE:
            if(lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
            {
                PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
                if(lpdbv->dbcv_flags == 0)
                {
                    qDebug() << "USB_Removed";
                    keyHook =SetWindowsHookEx( WH_KEYBOARD_LL,keyProc,Boardhinstance,0);
                }
            }
            break;
        }
    }
    return false;

}
void MainWindow::on_pushButton_6_clicked()
{
   // qDebug<<"sq";

      if(number==1)
      {
        keyHook =SetWindowsHookEx( WH_KEYBOARD_LL,keyProc,Boardhinstance,0);
        number=0;
      }
      //sleep(100000);
}