Qt 4.0: server.cpp Example File (network/fortuneserver/server.cpp)

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# server.cpp Example File
network/fortuneserver/server.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.
        **
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    ** and appearing in the file LICENSE.GPL included in the packaging of
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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);

            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(rand() % 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();
        }