Qt 监听 USb 设备拔插问题

[咖啡老猫]

我在监听USB设备的时候，消息可以显示设备的移除，插入，但是在读取设备的名称是，始终获得的是"\",请各位高手帮忙解答一下，环境：VS2010 + Qt 4.8.4
代码如下：

void MainWidget::registerNotifyEvent()
{
    static const GUID GUID_DEVINTERFACE_LIST[] =
    {
        //GUID_DEVINTERFACE_USB_DEVICE
        { 0xA5DCBF10, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } },
        //GUID_DEVINTERFACE_USB_CAMERA
        { 0x65E8773DL, 0x8F56, 0x11D0, { 0xA3, 0xB9, 0x00, 0xA0, 0xC9, 0x22, 0x31, 0x96}},
    };

    HDEVNOTIFY hDevNotify;
    DEV_BROADCAST_DEVICEINTERFACE NotifacationFiler;
    memset(¬ifacationFiler, 0, sizeof(DEV_BROADCAST_DEVICEINTERFACE));
    NotifacationFiler.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotifacationFiler.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;

    for(int i = 0; i < sizeof(GUID_DEVINTERFACE_LIST) / sizeof(GUID); i++)
    {
        NotifacationFiler.dbcc_classguid = GUID_DEVINTERFACE_LIST[i];
        hDevNotify = RegisterDeviceNotification((HANDLE)this->winId(), ¬ifacationFiler, DEVICE_NOTIFY_WINDOW_HANDLE);

        if(!hDevNotify)
        {
            int Err = GetLastError();
            qDebug() << "注册设备提醒消息失败";
        }
    }
}

bool MainWidget::winEvent(MSG *message, long *result)
{
    QString deviceName;
    if(message->message == WM_DEVICECHANGE)
    {
        PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)message->lParam;
        switch(message->wParam)
        {
        case DBT_DEVICEARRIVAL:
            if(lpdb->dbch_devicetype == DBT_DEVTYP_PORT)
            {
                PDEV_BROADCAST_PORT pDevPort = (PDEV_BROADCAST_PORT)lpdb;
                deviceName = QString::fromLocal8Bit(pDevPort->dbcp_name);

            }
            else if(lpdb->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
            {
                DEV_BROADCAST_DEVICEINTERFACE* dbdi = (DEV_BROADCAST_DEVICEINTERFACE*)lpdb;
                qDebug() << lstrlen(dbdi->dbcc_name);
                deviceName = QString::fromLocal8Bit(dbdi->dbcc_name + 4).toLower();
            }

            qDebug() << "插入设备" << deviceName;
            break;

        case DBT_DEVICEREMOVECOMPLETE:

            if(lpdb->dbch_devicetype == DBT_DEVTYP_PORT)
            {
                PDEV_BROADCAST_PORT pDevPort = (PDEV_BROADCAST_PORT)lpdb;
                deviceName = QString::fromLocal8Bit(pDevPort->dbcp_name + 4);

            }
            else if(lpdb->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
            {
                DEV_BROADCAST_DEVICEINTERFACE* dbdi = (DEV_BROADCAST_DEVICEINTERFACE*)lpdb;
                deviceName =QString::fromLocal8Bit(dbdi->dbcc_name + 4);
            }

            qDebug() << "移除设备" << deviceName;
            break;
        }
    }
    return false;
}

[咖啡老猫]

获得的qDebug() << "移除设备" << deviceName; 始终未 "\"