Qt加载网页图标

m_pNetAceManger = new QNetworkAccessManager(this);
m_pNetReplay = m_pNetAceManger->get(QNetworkRequest(QUrl(url)));
connect(m_pNetReplay, SIGNAL(finished()), this, SLOT(onFinished()));

void onFinished()
{
  m_pNetReplay->readAll();    
}

 下面的当图标加载不出来时则一直卡在这里！

　　 QNetworkAccessManager *manager = new QNetworkAccessManager();
    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl(url)));
    QByteArray responseData;
    QEventLoop eventLoop;

    QObject::connect(manager, SIGNAL(finished(QNetworkReply *)), &eventLoop, SLOT(quit()));

    eventLoop.exec();
    responseData = reply->readAll();

　　 QPixmap pix;
　　 pix.loadFromData(responseData);

　　 m_pPushButton->setIcon(QIcon(pix));