【qt】如何通过域名获得IP地址?

void MainWindow::lookupHost(const QHostInfo &hostInfo)
{
    QList<QHostAddress>addrList= hostInfo.addresses();
    if(!addrList.isEmpty())
    {
        for(int i=0;i<addrList.count();i++)
        {
            QHostAddress address=addrList[i];
            if(address.protocol()==QAbstractSocket::IPv6Protocol)
            {
                ui->textEdit->append(address.toString());
            }
        }
    }
}