Qt 4.6: server.cpp Example File (network/fortuneserver/server.cpp)

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

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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;
         }
         QString ipAddress;
         QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
         // use the first non-localhost IPv4 address
         for (int i = 0; i < ipAddressesList.size(); ++i) {
             if (ipAddressesList.at(i) != QHostAddress::LocalHost &&
                 ipAddressesList.at(i).toIPv4Address())
                 ipAddress = ipAddressesList.at(i).toString();
         }
         // if we did not find one, use IPv4 localhost
         if (ipAddress.isEmpty())
             ipAddress = QHostAddress(QHostAddress::LocalHost).toString();
         statusLabel->setText(tr("The server is running on\nIP: \n%1 port:\n%2\n"
                                 "Run the Fortune Client example now.")
                              .arg(ipAddress).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();
     }