بررسی اتصال به شبکه در QT

#include <QNetworkInterface>
#include <QDebug>

bool isConnectedToNetwork()‎
{
    QList<QNetworkInterface> ifaces = QNetworkInterface::allInterfaces()‎;‎
    bool result = false;‎

    for (int i = 0;‎ i < ifaces.count()‎;‎ i++)
    {
        QNetworkInterface iface = ifaces.at(i);‎
        if ( iface.flags()‎.testFlag(QNetworkInterface::IsUp)
             && !iface.flags()‎.testFlag(QNetworkInterface::IsLoopBack) )
        {

#ifdef DEBUG
            // details of connection
            qDebug()‎ << "name:" << iface.name()‎ << endl
                    << "ip addresses:" << endl
                    << "mac:" << iface.hardwareAddress()‎ << endl;‎
#endif

            // this loop is important
            for (int j=0;‎ j<iface.addressEntries()‎.count()‎;‎ j++)
            {
#ifdef DEBUG
                qDebug()‎ << iface.addressEntries()‎.at(j).ip()‎.toString()‎
                        << " / "‎ << iface.addressEntries()‎.at(j).netmask()‎.toString()‎ << endl;‎
#endif

                // we have an interface that is up, and has an ip address
                // therefore the link is present

                // we will only enable this check on first positive,
                // all later results are incorrect
                if (result == false)
                    result = true;‎
            }
        }

    }

    return result;‎
}

 output << endl << "Connection Status: " << ((isConnectedToNetwork()‎)?‎"Connected":"Disconnected") << endl;‎