SSDP NOTIFY

[sonichy]

Macast (https://xfangfang.github.io/Macast/) is python DLNA Media Renderer, I want to change it to Qt.
But on_pushButton_notify_clicked() has no respond!
Source: https://github.com/sonichy/HTYDLNA

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    groupAddress = QHostAddress("239.255.255.250");
    socket = new QUdpSocket(this);
    auto ok = socket->bind(QHostAddress::AnyIPv4, 8000, QUdpSocket::ShareAddress);
    connect(socket, SIGNAL(readyRead()), this, SLOT(readMsg()));    
    if (!ok) {
        return;
    }

    ok = socket->joinMulticastGroup(groupAddress);    
    if (!ok) {
        return;
    }

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::readMsg()
{    
    while (socket->hasPendingDatagrams()) {
        QByteArray reply;
        reply.resize(socket->pendingDatagramSize());
        socket->readDatagram(reply.data(), reply.size());
        qDebug() << c;
        qDebug() << reply.data();
    }
    c++;
}


void MainWindow::on_pushButton_discover_clicked()
{
    c = 0;
    QByteArray message("M-SEARCH * HTTP/1.1\r\n"
                       "Host:239.255.255.250:1900\r\n"
                       //"ST: ssdp:all\r\n"
                       "ST: upnp:rootdevice\r\n"
                       "Man: \"ssdp:discover\"\r\n"
                       "MX: 3\r\n"
                       "\r\n");    

    auto writeOk = socket->writeDatagram(message.data(), groupAddress, 1900);
    if (writeOk == -1) {
        qDebug() << "Writing Datagram failed";
    }
}

void MainWindow::on_pushButton_notify_clicked()
{
    c = 0;
    QByteArray message("NOTIFY * HTTP/1.1\r\n"
                       "HOST: 239.255.255.250:1900\r\n"
                      "ST: upnp:rootdevice\r\n"                      
                       "NTS: ssdp:alive\r\n"
                       "LOCATION: http://192.168.2.100:8000/description.xml\r\n"
                       "USN: uuid:1234567890-abcdefg-hijklmn-opqrst-uvwxyz::upnp:rootdevice\r\n"
                       "CACHE-CONTROL: max-age=300\r\n"
                       "SERVER: 3.4.72-rt89 DLNADOC/1.50 UPnP/1.0 SakaueDLNA/1.1.0"
                       "\r\n");

    auto writeOk = socket->writeDatagram(message.data(), groupAddress, 1900);
    if (writeOk == -1) {
        qDebug() << "Writing Datagram failed";
    }
}

[SGaist]

Hi,

When testing for an error, it's usually a good idea to at least print that something went wrong and not just exit early like you do in your constructor.