Qt 4.3: fortunethread.cpp Example File (network/blockingfortuneclient/fortunethread.cpp)

|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# fortunethread.cpp Example File
network/blockingfortuneclient/fortunethread.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2004-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License versions 2.0 or 3.0 as published by the Free Software
     ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
     ** included in the packaging of this file.  Alternatively you may (at
     ** your option) use any later version of the GNU General Public
     ** License if such license has been publicly approved by Trolltech ASA
     ** (or its successors, if any) and the KDE Free Qt Foundation. In
     ** addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.1, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** Please review the following information to ensure GNU General
     ** Public Licensing requirements will be met:
     ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
     ** you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech, as the sole
     ** copyright holder for Qt Designer, grants users of the Qt/Eclipse
     ** Integration plug-in the right for the Qt/Eclipse Integration to
     ** link to functionality provided by Qt Designer and its related
     ** libraries.
     **
     ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
     ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
     ** granted herein.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #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;
         }
     }