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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">dialog.cpp Example File<br /><small><small>network/loopback/dialog.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

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** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** 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 <QtGui>

#include <QtNetwork>

#include "dialog.h"

static const int TotalBytes = 50 * 1024 * 1024;

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"));

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(SocketError)),

this, SLOT(displayError(SocketError)));

QHBoxLayout *buttonLayout = new QHBoxLayout;

buttonLayout->addStretch(1);

buttonLayout->addWidget(startButton);

buttonLayout->addWidget(quitButton);

QVBoxLayout *mainLayout = new QVBoxLayout;

mainLayout->addWidget(clientProgressBar);

mainLayout->addWidget(clientStatusLabel);

mainLayout->addWidget(serverProgressBar);

mainLayout->addWidget(serverStatusLabel);

mainLayout->addLayout(buttonLayout);

setLayout(mainLayout);

setWindowTitle(tr("Loopback"));

}

void Dialog::start()

{

startButton->setEnabled(false);

QApplication::setOverrideCursor(Qt::WaitCursor);

bytesWritten = 0;

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bytesReceived = 0;

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while (!tcpServer.isListening() && !tcpServer.listen()) {

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int ret = QMessageBox::critical(this, tr("Loopback"),

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tr("Unable to start the test: %1.")

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.arg(tcpServer.errorString()),

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QMessageBox::Retry,

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QMessageBox::Cancel);

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if (ret == QMessageBox::Cancel)

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return;

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}

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serverStatusLabel->setText(tr("Listening"));

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clientStatusLabel->setText(tr("Connecting"));

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tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());

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}

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void Dialog::acceptConnection()

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{

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tcpServerConnection = tcpServer.nextPendingConnection();

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connect(tcpServerConnection, SIGNAL(readyRead()),

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this, SLOT(updateServerProgress()));

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connect(tcpServerConnection, SIGNAL(error(SocketError)),

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this, SLOT(displayError(SocketError)));

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serverStatusLabel->setText(tr("Accepted connection"));

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tcpServer.close();

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}

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void Dialog::startTransfer()

130

{

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bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, '@'));

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clientStatusLabel->setText(tr("Connected"));

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}

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void Dialog::updateServerProgress()

136

{

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bytesReceived += (int)tcpServerConnection->bytesAvailable();

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tcpServerConnection->readAll();

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serverProgressBar->setMaximum(TotalBytes);

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serverProgressBar->setValue(bytesReceived);

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serverStatusLabel->setText(tr("Received %1MB")

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.arg(bytesReceived / (1024 * 1024)));

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if (bytesReceived == TotalBytes) {

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tcpServerConnection->close();

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startButton->setEnabled(true);

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QApplication::restoreOverrideCursor();

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}

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}

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void Dialog::updateClientProgress(qint64 numBytes)

153

{

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bytesWritten += (int)numBytes;

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if (bytesToWrite > 0)

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bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@'));

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clientProgressBar->setMaximum(TotalBytes);

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clientProgressBar->setValue(bytesWritten);

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clientStatusLabel->setText(tr("Sent %1MB")

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.arg(bytesWritten / (1024 * 1024)));

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}

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void Dialog::displayError(QTcpSocket::SocketError socketError)

165

{

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if (socketError == QTcpSocket::RemoteHostClosedError)

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return;

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QMessageBox::information(this, tr("Network error"),

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tr("The following error occurred: %1.")

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.arg(tcpClient.errorString()));

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tcpClient.close();

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tcpServer.close();

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clientProgressBar->reset();

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serverProgressBar->reset();

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clientStatusLabel->setText(tr("Client ready"));

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serverStatusLabel->setText(tr("Server ready"));

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startButton->setEnabled(true);

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QApplication::restoreOverrideCursor();

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}</pre>

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