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/****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
#include <QtNetwork>
#include "dialog.h"
#if !defined(Q_OS_WINCE) && !defined(Q_OS_SYMBIAN)
static const int TotalBytes = 50 * 1024 * 1024;
#else
static const int TotalBytes = 5 * 1024 * 1024;
#endif
static const int PayloadSize = 64 * 1024; // 64 KB
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()
{
// called when the TCP client connected to the loopback server
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)
{
// callen when the TCP client has written some bytes
bytesWritten += (int)numBytes;
// only write more if not finished and when the Qt write buffer is below a certain size.
if (bytesToWrite > 0 && tcpClient.bytesToWrite() <= 4*PayloadSize)
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
}
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