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server.cpp Example File
network/fortuneserver/server.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information (qt-info@nokia.com)
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
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 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
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 ** GNU General Public License Usage
 ** Alternatively, 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 file LICENSE.GPL included in
 ** the packaging of this file.  Please review the following information
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 #include <QtGui>
 #include <QtNetwork>

 #include <stdlib.h>

 #include "server.h"

 Server::Server(QWidget *parent)
     : QDialog(parent)
 {
     statusLabel = new QLabel;
     quitButton = new QPushButton(tr("Quit"));
     quitButton->setAutoDefault(false);

     tcpServer = new QTcpServer(this);
     if (!tcpServer->listen()) {
         QMessageBox::critical(this, tr("Fortune Server"),
                               tr("Unable to start the server: %1.")
                               .arg(tcpServer->errorString()));
         close();
         return;
     }

     statusLabel->setText(tr("The server is running on port %1.\n"
                             "Run the Fortune Client example now.")
                          .arg(tcpServer->serverPort()));

     fortunes << tr("You've been leading a dog's life. Stay off the furniture.")
              << tr("You've got to think about tomorrow.")
              << tr("You will be surprised by a loud noise.")
              << tr("You will feel hungry again in another hour.")
              << tr("You might have mail.")
              << tr("You cannot kill time without injuring eternity.")
              << tr("Computers are not intelligent. They only think they are.");

     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
     connect(tcpServer, SIGNAL(newConnection()), this, SLOT(sendFortune()));

     QHBoxLayout *buttonLayout = new QHBoxLayout;
     buttonLayout->addStretch(1);
     buttonLayout->addWidget(quitButton);
     buttonLayout->addStretch(1);

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->addWidget(statusLabel);
     mainLayout->addLayout(buttonLayout);
     setLayout(mainLayout);

     setWindowTitle(tr("Fortune Server"));
 }

 void Server::sendFortune()
 {
     QByteArray block;
     QDataStream out(&block, QIODevice::WriteOnly);
     out.setVersion(QDataStream::Qt_4_0);
     out << (quint16)0;
     out << fortunes.at(qrand() % fortunes.size());
     out.device()->seek(0);
     out << (quint16)(block.size() - sizeof(quint16));

     QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
     connect(clientConnection, SIGNAL(disconnected()),
             clientConnection, SLOT(deleteLater()));

     clientConnection->write(block);
     clientConnection->disconnectFromHost();
 }

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