Windows下Qt檢測移動U盤及動態插拔

windows下提供了很便捷的方式查找和動態監測U盤的插拔。windows sdk裏面提供了對應api。從所有的事件中處理對應的事件即可。

Device Management Events

1.U盤已插入電腦的情況下。使用QDir獲取所有驅動，再通過驅動類型判斷和查找移動U盤。以下爲關鍵代碼段

    QFileInfoList infoList = QDir::drives();
    foreach(const QFileInfo& info, infoList)
    {
        QString path = info.filePath();
        UINT iRes = ::GetDriveType((WCHAR *)path.toStdWString().c_str());
        if (DRIVE_REMOVABLE == iRes)
        {
            qDebug() << path;
        }
    }

 

2.通過QAbstractNativeEventFilter，或nativeEvent方法來監測U盤的接入或拔出。

        PDEV_BROADCAST_HDR lpdbh = (PDEV_BROADCAST_HDR)msg->lParam;
        switch (msg->wParam)
        {
        case DBT_DEVICEARRIVAL:
        case DBT_DEVICEREMOVECOMPLETE:
            if (lpdbh->dbch_devicetype == DBT_DEVTYP_VOLUME)
            {
                PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdbh;
                //0:uDisk etc.  1.cd driver
                if (lpdbv->dbcv_flags == 0)
                {
                    //....
                }
            }
            break;
        }

參考鏈接：

https://docs.microsoft.com/en-us/windows/win32/devio/device-management-events