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fortunethread.cpp Example File
^{network/blockingfortuneclient/fortunethread.cpp}

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    **
    ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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    **
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    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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    ****************************************************************************/

    #include <QtNetwork>

    #include "fortunethread.h"

    FortuneThread::FortuneThread(QObject *parent)
        : QThread(parent), quit(false)
    {
    }

    FortuneThread::~FortuneThread()
    {
        quit = true;
        cond.wakeOne();
        wait();
    }

    void FortuneThread::requestNewFortune(const QString &hostName, quint16 port)
    {
        QMutexLocker locker(&mutex);
        this->hostName = hostName;
        this->port = port;
        if (!isRunning())
            start();
        else
            cond.wakeOne();
    }

    void FortuneThread::run()
    {
        mutex.lock();
        QString serverName = hostName;
        quint16 serverPort = port;
        mutex.unlock();

        while (!quit) {
            const int Timeout = 5 * 1000;

            QTcpSocket socket;
            socket.connectToHost(serverName, serverPort);

            if (!socket.waitForConnected(Timeout)) {
                emit error(socket.error(), socket.errorString());
                return;
            }

            while (socket.bytesAvailable() < (int)sizeof(quint16)) {
                if (!socket.waitForReadyRead(Timeout)) {
                    emit error(socket.error(), socket.errorString());
                    return;
                }
            }

            quint16 blockSize;
            QDataStream in(&socket);
            in.setVersion(QDataStream::Qt_4_0);
            in >> blockSize;

            while (socket.bytesAvailable() < blockSize) {
                if (!socket.waitForReadyRead(Timeout)) {
                    emit error(socket.error(), socket.errorString());
                    return;
                }
            }

            QMutexLocker locker(&mutex);

            QString fortune;
            in >> fortune;
            emit newFortune(fortune);

            cond.wait(&mutex);
            serverName = hostName;
            serverPort = port;
        }
    }