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==Loopback QTcpServer and QTcpSocket==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 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 to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QTcpServer>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QProgressBar;
class QPushButton;
class QTcpServer;
class QTcpSocket;
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
public slots:
void start();
void acceptConnection();
void startTransfer();
void updateServerProgress();
void updateClientProgress(qint64 numBytes);
void displayError(QAbstractSocket::SocketError socketError);
private:
QProgressBar *clientProgressBar;
QProgressBar *serverProgressBar;
QLabel *clientStatusLabel;
QLabel *serverStatusLabel;
QPushButton *startButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpServer tcpServer;
QTcpSocket tcpClient;
QTcpSocket *tcpServerConnection;
int bytesToWrite;
int bytesWritten;
int bytesReceived;
};
#endif

#include <QtGui>
#include <QtNetwork>
#include "dialog.h"
#if !defined(Q_OS_WINCE)
static const int TotalBytes = 50 * 1024 * 1024;
#else
static const int TotalBytes = 5 * 1024 * 1024;
#endif
static const int PayloadSize = 65536;
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
clientProgressBar = new QProgressBar;
clientStatusLabel = new QLabel(tr("Client ready"));
serverProgressBar = new QProgressBar;
serverStatusLabel = new QLabel(tr("Server ready"));
startButton = new QPushButton(tr("&Start"));
quitButton = new QPushButton(tr("&Quit"));
buttonBox = new QDialogButtonBox;
buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
connect(startButton, SIGNAL(clicked()), this, SLOT(start()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
connect(&tcpServer, SIGNAL(newConnection()),
this, SLOT(acceptConnection()));
connect(&tcpClient, SIGNAL(connected()), this, SLOT(startTransfer()));
connect(&tcpClient, SIGNAL(bytesWritten(qint64)),
this, SLOT(updateClientProgress(qint64)));
connect(&tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(displayError(QAbstractSocket::SocketError)));
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(clientProgressBar);
mainLayout->addWidget(clientStatusLabel);
mainLayout->addWidget(serverProgressBar);
mainLayout->addWidget(serverStatusLabel);
mainLayout->addStretch(1);
mainLayout->addSpacing(10);
mainLayout->addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr("Loopback"));
}
void Dialog::start()
{
startButton->setEnabled(false);
#ifndef QT_NO_CURSOR
QApplication::setOverrideCursor(Qt::WaitCursor);
#endif
bytesWritten = 0;
bytesReceived = 0;
while (!tcpServer.isListening() && !tcpServer.listen()) {
QMessageBox::StandardButton ret = QMessageBox::critical(this,
tr("Loopback"),
tr("Unable to start the test: %1.")
.arg(tcpServer.errorString()),
QMessageBox::Retry
| QMessageBox::Cancel);
if (ret == QMessageBox::Cancel)
return;
}
serverStatusLabel->setText(tr("Listening"));
clientStatusLabel->setText(tr("Connecting"));
tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());
}
void Dialog::acceptConnection()
{
tcpServerConnection = tcpServer.nextPendingConnection();
connect(tcpServerConnection, SIGNAL(readyRead()),
this, SLOT(updateServerProgress()));
connect(tcpServerConnection, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(displayError(QAbstractSocket::SocketError)));
serverStatusLabel->setText(tr("Accepted connection"));
tcpServer.close();
}
void Dialog::startTransfer()
{
bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, "@"));
clientStatusLabel->setText(tr("Connected"));
}
void Dialog::updateServerProgress()
{
bytesReceived += (int)tcpServerConnection->bytesAvailable();
tcpServerConnection->readAll();
serverProgressBar->setMaximum(TotalBytes);
serverProgressBar->setValue(bytesReceived);
serverStatusLabel->setText(tr("Received %1MB")
.arg(bytesReceived / (1024 * 1024)));
if (bytesReceived == TotalBytes) {
tcpServerConnection->close();
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}
}
void Dialog::updateClientProgress(qint64 numBytes)
{
bytesWritten += (int)numBytes;
if (bytesToWrite > 0)
bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), "@"));
clientProgressBar->setMaximum(TotalBytes);
clientProgressBar->setValue(bytesWritten);
clientStatusLabel->setText(tr("Sent %1MB")
.arg(bytesWritten / (1024 * 1024)));
}
void Dialog::displayError(QAbstractSocket::SocketError socketError)
{
if (socketError == QTcpSocket::RemoteHostClosedError)
return;
QMessageBox::information(this, tr("Network error"),
tr("The following error occurred: %1.")
.arg(tcpClient.errorString()));
tcpClient.close();
tcpServer.close();
clientProgressBar->reset();
serverProgressBar->reset();
clientStatusLabel->setText(tr("Client ready"));
serverStatusLabel->setText(tr("Server ready"));
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}

#include <QApplication>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
return dialog.exec();
}

</source>

==QTcpServer based server==

<source lang="cpp">

Foundations of Qt Development\Chapter14\tcpserver\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QCoreApplication>
#include "server.h"
int main( int argc, char **argv )
{
QCoreApplication app( argc, argv );

Server server;
if( !server.listen( QHostAddress::Any, 9876 ) )
{
qCritical( "Cannot listen to port 9876." );
return 1;
}

return app.exec();
}

Foundations of Qt Development\Chapter14\tcpserver\server.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QTcpServer>
#include <QTcpSocket>
#include "server.h"
#include "serverthread.h"
Server::Server() : QTcpServer()
{
}
void Server::incomingConnection( int descriptor )
{
ServerThread *thread = new ServerThread( descriptor, this );

connect( thread, SIGNAL(finished()), thread, SLOT(deleteLater()) );
thread->start();
}

Foundations of Qt Development\Chapter14\tcpserver\server.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef SERVER_H
#define SERVER_H
#include <QTcpServer>
class Server : public QTcpServer
{
public:
Server();

protected:
void incomingConnection( int descriptor );
};
#endif // SERVER_H

Foundations of Qt Development\Chapter14\tcpserver\serverthread.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QBuffer>
#include <QImage>
#include <QImageWriter>
#include <QTcpSocket>
#include <QDir>
#include <QTime>
#include "serverthread.h"
ServerThread::ServerThread( int descriptor, QObject *parent ) : QThread( parent )
{
m_descriptor = descriptor;
}
void ServerThread::run()
{
QTcpSocket socket;

if( !socket.setSocketDescriptor( m_descriptor ) )
{
qDebug( "Socket error!" );
return;
}

QBuffer buffer;
QImageWriter writer(&buffer, "PNG");
writer.write( randomImage() );

QByteArray data;
QDataStream stream( &data, QIODevice::WriteOnly );
stream.setVersion( QDataStream::Qt_4_0 );
stream << (quint32)buffer.data().size();
data.append( buffer.data() );

socket.write( data );

socket.disconnectFromHost();
socket.waitForDisconnected();
}
QImage ServerThread::randomImage()
{
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

QDir dir("./images");
dir.setFilter( QDir::Files );
QFileInfoList entries = dir.entryInfoList();

if( entries.size() == 0 )
{
qDebug( "No images to show!" );
return QImage();
}

return QImage( entries.at( qrand() % entries.size() ).absoluteFilePath() );
}

Foundations of Qt Development\Chapter14\tcpserver\serverthread.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef SERVERTHREAD_H
#define SERVERTHREAD_H
#include <QThread>
#include <QImage>
class ServerThread : public QThread
{
public:
ServerThread( int descriptor, QObject *parent );

void run();
private:
QImage randomImage();

int m_descriptor;
};
#endif // SERVERTHREAD_H

</source>

==QTcpServer based server 2==

<source lang="cpp">

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 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 to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef SERVER_H
#define SERVER_H
#include <QDialog>
QT_BEGIN_NAMESPACE
class QLabel;
class QPushButton;
class QTcpServer;
QT_END_NAMESPACE

class Server : public QDialog
{
Q_OBJECT
public:
Server(QWidget *parent = 0);
private slots:
void sendFortune();
private:
QLabel *statusLabel;
QPushButton *quitButton;
QTcpServer *tcpServer;
QStringList fortunes;
};

#endif

#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();
}

#include <QApplication>
#include <QtCore>
#include <stdlib.h>
#include "server.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Server server;
server.show();
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return server.exec();
}

</source>

==Thread based server==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 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 to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef FORTUNESERVER_H
#define FORTUNESERVER_H
#include <QStringList>
#include <QTcpServer>

class FortuneServer : public QTcpServer
{
Q_OBJECT
public:
FortuneServer(QObject *parent = 0);
protected:
void incomingConnection(int socketDescriptor);
private:
QStringList fortunes;
};

#endif

#include "fortuneserver.h"
#include "fortunethread.h"
#include <stdlib.h>

FortuneServer::FortuneServer(QObject *parent)
: QTcpServer(parent)
{
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.");
}

void FortuneServer::incomingConnection(int socketDescriptor)
{
QString fortune = fortunes.at(qrand() % fortunes.size());
FortuneThread *thread = new FortuneThread(socketDescriptor, fortune, this);
connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
thread->start();
}

#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include "fortuneserver.h"
QT_BEGIN_NAMESPACE
class QLabel;
class QPushButton;
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
private:
QLabel *statusLabel;
QPushButton *quitButton;
FortuneServer server;
};
#endif

#include <QtGui>
#include <QtNetwork>
#include <stdlib.h>
#include "dialog.h"
#include "fortuneserver.h"
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
statusLabel = new QLabel;
quitButton = new QPushButton(tr("Quit"));
quitButton->setAutoDefault(false);
if (!server.listen()) {
QMessageBox::critical(this, tr("Threaded Fortune Server"),
tr("Unable to start the server: %1.")
.arg(server.errorString()));
close();
return;
}
statusLabel->setText(tr("The server is running on port %1.\n"
"Run the Fortune Client example now.")
.arg(server.serverPort()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
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("Threaded Fortune Server"));
}

#ifndef FORTUNETHREAD_H
#define FORTUNETHREAD_H
#include <QThread>
#include <QTcpSocket>

class FortuneThread : public QThread
{
Q_OBJECT
public:
FortuneThread(int socketDescriptor, const QString &fortune, QObject *parent);
void run();
signals:
void error(QTcpSocket::SocketError socketError);
private:
int socketDescriptor;
QString text;
};

#endif

#include "fortunethread.h"
#include <QtNetwork>

FortuneThread::FortuneThread(int socketDescriptor, const QString &fortune, QObject *parent)
: QThread(parent), socketDescriptor(socketDescriptor), text(fortune)
{
}

void FortuneThread::run()
{
QTcpSocket tcpSocket;

if (!tcpSocket.setSocketDescriptor(socketDescriptor)) {
emit error(tcpSocket.error());
return;
}

QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_0);
out << (quint16)0;
out << text;
out.device()->seek(0);
out << (quint16)(block.size() - sizeof(quint16));

tcpSocket.write(block);
tcpSocket.disconnectFromHost();
tcpSocket.waitForDisconnected();
}

#include <QApplication>
#include <QtCore>
#include <stdlib.h>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return dialog.exec();
}

</source>

C++/Qt/QTcpServer - История изменений

в 14:21, 25 мая 2010

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