C++ QUdpSocket::connectToHost方法代码示例

QString connection::Broadcast() {
    // Om ip adressen te ontdekken
    QNetworkAddressEntry inter;
    // sockets aanmaken en verbinden met enerzijds broadcast en anderzijds een luister poort
    QUdpSocket udpSocketSend;
    QUdpSocket udpSocketGet;
    udpSocketSend.connectToHost(inter.broadcast(), 40000);
    // udpSocketGet->bind(inter->ip(),667);
    // udpSocketGet->bind(QHostAddress::Any,667)
    if(udpSocketGet.bind(udpgetport,QUdpSocket::ShareAddress))
        Label->setText(Label->text() + "[INFO] Could properly bind udpSocketget to " + QString::number(udpgetport) + "\n");
    else Label->setText(Label->text() + "[INFO] Couldn't properly bind udpSocketget to " + QString::number(udpgetport) + "\n");
    // Pakket verzenden
    QByteArray send_datagram = "DISCOVER-STRATEGO-SERVER";
    // Optimalisatie voor in de loop
    QByteArray receive_datagram;

    quint16 serverPort;
    forever{
        udpSocketSend.writeDatagram(send_datagram, QHostAddress::Broadcast, 40000);
        if(udpSocketGet.waitForReadyRead(3000)){
            receive_datagram.resize(udpSocketGet.pendingDatagramSize());
            udpSocketGet.readDatagram(receive_datagram.data(),receive_datagram.size(),&server,&serverPort);
            if(QString::fromUtf8(receive_datagram.data()) == "DISCOVERED-STRATEGO-SERVER")
            {
                receive_datagram.resize(udpSocketGet.pendingDatagramSize());
                udpSocketGet.readDatagram(receive_datagram.data(),receive_datagram.size(),&server,&serverPort);
                Label->setText(Label->text() +"[INFO] PLAYER DATA: "+ receive_datagram.data() +"\n");
                speler = receive_datagram.toInt();
                if(speler==1)
                {
                    attacker=true;
                }
                else
                {
                    attacker=false;
                }
                receive_datagram.resize(udpSocketGet.pendingDatagramSize());
                udpSocketGet.readDatagram(receive_datagram.data(),receive_datagram.size(),&server,&serverPort);
                Label->setText(Label->text() + "[INFO] GAME DATA: "+receive_datagram.data()+"\n");
                spel = receive_datagram.toInt();
                Label->setText(Label->text() + " SPEL:" + QString::number(spel) + "\n");
                Label->setText(Label->text() + "[INFO] Found STRATEGO-SERVER on " + server.toString().toUtf8().constData() + "\n");
                return server.toString();
            }
        }
        else
        {
            Label->setText(Label->text() + "[INFO] UDP Discover TimeOut!\n");
            static int timeout=0;
            timeout++;
            if(timeout==5)
            {
                Label->setText(Label->text() + "[ERROR] Server is not online. Please try again later!");
                return "";
            }
        }
    }
    return "";
}

void TimeSync::getNTPTime()
{
    QUdpSocket sock;
    sock.connectToHost("0.pool.ntp.org",123);
    if(!sock.waitForConnected(1000))return;
    QByteArray data(48,char(0)); *(reinterpret_cast<qint32 *>(&data.data()[0]))=4194959577;
    if(sock.write(data)<0||!sock.waitForReadyRead(3000)||sock.bytesAvailable()!=48)return;
    data=sock.readAll();
    quint32 seconds=qToBigEndian(*(reinterpret_cast<quint32 *>(&data.data()[40])));
    quint32 fraction=qToBigEndian(*(reinterpret_cast<quint32 *>(&data.data()[44])));
    quint32 newTime=QDateTime::fromMSecsSinceEpoch(seconds*1000ll+fraction*1000ll/0x100000000ll-2208988800000ll).toTime_t();

    if(newTime<1451606400 || newTime>4000000000){
        QThread::msleep(500);
        emit startSync();
        return;
    }
    qint32 tempTimeShift=qint64(newTime)-qint64(QDateTime::currentDateTime().toTime_t());

    if(timeShift!=0)tempTimeShift=qint32((qint64(timeShift)+qint64(tempTimeShift))/2);

    if(tempTimeShift>3600 || tempTimeShift<-3600){
        static bool showMessage=true;
        if(showMessage)emit warningMessage(julyTr("TIME_SYNC_ERROR","Your clock is not set. Please close the Qt Bitcoin Trader and set the clock. Changing time at Qt Bitcoin Trader enabled can cause errors and damage the keys."));
        showMessage=false;
    }
    else
        timeShift.fetchAndStoreOrdered(tempTimeShift);

    getNTPTimeRetryCount++;
    if(getNTPTimeRetryCount<3)emit startSync();
}

bool EditorPipe::sendToEditor(QString command)
{
    QUdpSocket socket;
    // Attempt to connect to the LocalServer
    socket.connectToHost(QHostAddress::LocalHost, 58487);

    if(socket.waitForConnected(100))
    {
        qDebug() << "Connected";
        QString str = QString(command);
        QByteArray bytes;
        bytes = str.toUtf8();
        socket.write(bytes);
        socket.waitForBytesWritten(10000);
        socket.flush();
        socket.disconnectFromHost();
        qDebug() << "Bytes sent: " <<command;
        return true;
    }
    else
    {
        qDebug() << "sendToEditor(QString command) fail to connect: " << socket.errorString();
        return false;
    }
}

void tst_QUdpSocket::performance()
{
    QUdpSocket server;
    QVERIFY2(server.bind(), server.errorString().toLatin1().constData());

    QHostAddress serverAddress = QHostAddress::LocalHost;
    if (!(server.localAddress() == QHostAddress::Any))
        serverAddress = server.localAddress();

    QUdpSocket client;
    client.connectToHost(serverAddress, server.localPort());

    QByteArray arr(8192, '@');

    QTime stopWatch;
    stopWatch.start();

    qint64 nbytes = 0;
    while (stopWatch.elapsed() < 5000) {
        for (int i = 0; i < 100; ++i) {
            if (client.write(arr.data(), arr.size()) > 0) {
                do {
                    nbytes += server.readDatagram(arr.data(), arr.size());
                } while (server.hasPendingDatagrams());
            }
        }
    }

    float secs = stopWatch.elapsed() / 1000.0;
    qDebug("\t%.2fMB/%.2fs: %.2fMB/s", float(nbytes / (1024.0*1024.0)),
           secs, float(nbytes / (1024.0*1024.0)) / secs);
}

void tst_QUdpSocket::writeToNonExistingPeer()
{
    QSKIP("Connected-mode UDP sockets and their behaviour are erratic", SkipAll);
    QFETCH(QHostAddress, peerAddress);
    quint16 peerPort = 34534;
    qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");

    QUdpSocket sConnected;
    QSignalSpy sConnectedReadyReadSpy(&sConnected, SIGNAL(readyRead()));
    QSignalSpy sConnectedErrorSpy(&sConnected, SIGNAL(error(QAbstractSocket::SocketError)));
    sConnected.connectToHost(peerAddress, peerPort, QIODevice::ReadWrite);

    // the first write succeeds...
    QCOMPARE(sConnected.write("", 1), qint64(1));

    // the second one should fail!
    QTest::qSleep(1000);                   // do not process events
    QCOMPARE(sConnected.write("", 1), qint64(-1));
    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // the third one will succeed...
    QCOMPARE(sConnected.write("", 1), qint64(1));
    QTestEventLoop::instance().enterLoop(1);
    QCOMPARE(sConnectedReadyReadSpy.count(), 0);
    QCOMPARE(sConnectedErrorSpy.count(), 1);
    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // we should now get a read error
    QCOMPARE(sConnected.write("", 1), qint64(1));
    QTest::qSleep(1000);                   // do not process events
    char buf[2];
    QVERIFY(!sConnected.hasPendingDatagrams());
    QCOMPARE(sConnected.bytesAvailable(), Q_INT64_C(0));
    QCOMPARE(sConnected.pendingDatagramSize(), Q_INT64_C(-1));
    QCOMPARE(sConnected.readDatagram(buf, 2), Q_INT64_C(-1));
    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    QCOMPARE(sConnected.write("", 1), qint64(1));
    QTest::qSleep(1000);                   // do not process events
    QCOMPARE(sConnected.read(buf, 2), Q_INT64_C(0));
    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // we should still be connected
    QCOMPARE(int(sConnected.state()), int(QUdpSocket::ConnectedState));
}

inline static void connect()
{
    socket_.connectToHost(QHostAddress(QHostAddress::LocalHost), PORT);
}

/**
 * @details
 * Creates an open UDP socket. The socket will be deleted by the base class.
 */
QIODevice* AbstractUdpEmulator::createDevice()
{
    QUdpSocket* socket = new QUdpSocket;
    socket->connectToHost(_host, _port);
    return socket;
}

int udp_ping(QStringList command) {
    qDebug() << "udp_ping(" << command.join(" ") << ")" << endl;
    qDebug() << "udp_ping(" << command.join(" ") << ")" << endl;

    /**
     * Check input
     */
    QTextStream errorStream(stderr);

    if(command.size() != 3 || command.at(0)!="ping" || command.at(1)!="udp" ) {

        errorStream << "Error: udp_ping(" << command.join(" ") << ") is no valid call (ping udp <ip_address> <port> rzv|max|random|default)" << endl;
        return 1;
    }


    /**
     * <functionality>
     */


    QByteArray byteArray;

    /**
     * CIP for "rzv"
     */
    if(command.at(2)=="rzv") {
        qDebug() << "rzv" << endl;

        byteArray.append(QByteArray(42, '\0'));
     }


    /**
     * Sent via TCP
     */
    QUdpSocket *udpSocket;
    udpSocket = new QUdpSocket();
    QTextStream outStream(stdout);

    QString out;

    udpSocket->abort();
    udpSocket->connectToHost("127.0.0.1", 22366);

    qDebug() << "waitForConnected!";
    if (udpSocket->waitForConnected(5000)) {
        qDebug() << "Connected!";
    }
    else {
        errorStream << "Error: udp_ping(" << command.join(" ") << "): No connection available!" << endl;
        return 1;
    }

    qDebug() << QString("BytesWritten: %1").arg(udpSocket->write(byteArray, byteArray.length()));
    udpSocket->flush();

    int numRead = 0, numReadTotal = 0;
    char buffer[MAXMSG];

    forever {
        numRead  = udpSocket->read(buffer, MAXMSG);
        qDebug() << "read buffer: " << numRead;

        numReadTotal += numRead;
        if (numRead <= 0 && !udpSocket->waitForReadyRead(30))
            break;
    }
    qDebug() << numReadTotal << " bytes red";

    if(numReadTotal==-1) {
        errorStream << "Error: udp_ping(" << command.join(" ") << "): " << udpSocket->errorString() << endl;
        return 1;
    }
    else {
        for(int i=0; i < numReadTotal; i++) {
            qDebug() << QString("receipt[%1]: %2\n").arg(i).arg(buffer[i], 8, 2, QLatin1Char('0')) << endl;;
        }
        QByteArray receipt(buffer);


        qDebug() << "receipt.size(): " << receipt.size();

        for(int i = 0; i < receipt.size();++i) {
           qDebug() << QString("receipt[%1]: %2\n").arg(i).arg(receipt.at(i), 8, 2, QLatin1Char('0')) << endl;;
        }
        qDebug() << "buffer: " << buffer;
    }

    udpSocket->disconnectFromHost();
    udpSocket->close();

    outStream << out << endl;

    return 0;
}