|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# dialog.cpp Example File
network/loopback/dialog.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2004-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License versions 2.0 or 3.0 as published by the Free Software
     ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
     ** included in the packaging of this file.  Alternatively you may (at
     ** your option) use any later version of the GNU General Public
     ** License if such license has been publicly approved by Trolltech ASA
     ** (or its successors, if any) and the KDE Free Qt Foundation. In
     ** addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.1, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** Please review the following information to ensure GNU General
     ** Public Licensing requirements will be met:
     ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
     ** you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech, as the sole
     ** copyright holder for Qt Designer, grants users of the Qt/Eclipse
     ** Integration plug-in the right for the Qt/Eclipse Integration to
     ** link to functionality provided by Qt Designer and its related
     ** libraries.
     **
     ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
     ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
     ** granted herein.
     **
     ** 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"));

         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);

         QApplication::setOverrideCursor(Qt::WaitCursor);

         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);
             QApplication::restoreOverrideCursor();
         }
     }

     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);
         QApplication::restoreOverrideCursor();
     }