Help with QNetworkConfigurationManager!

[tzqdo]

@QNetworkConfigurationManager *mgr = new QNetworkConfigurationManager(this);

//mgr->updateConfigurations();

QList<QNetworkConfiguration> activeConfigs = mgr->allConfigurations(QNetworkConfiguration::Active);

if (activeConfigs.count() <= 0){

    qDebug()<<"activeConfigs:"<<activeConfigs.count();

    QMessageBox::warning(this,tr("Connection problems"),

                              tr("No active ethernet connection found\nPlease check your ethernet wiring"));

    //exit(0);

}@

The debug version works properly,but the release version always prompt the warning dialog!

If I add the following code，It will never exit loop.exec(),regardless of debug or release version.
@QEventLoop loop;
QObject::connect(mgr, SIGNAL(updateCompleted()), &loop, SLOT(quit()));
loop.exec();@

[tzqdo]

Any one else come up against the problem?

[tzqdo]

dig it.