1 files changed, 190 insertions, 0 deletions
diff --git a/examples/network/loopback/dialog.cpp b/examples/network/loopback/dialog.cpp
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+++ b/examples/network/loopback/dialog.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "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 Nokia Corporation and its Subsidiary(-ies) 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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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
+}