<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.2: dialog.cpp Example File (network/loopback/dialog.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">dialog.cpp Example File<br /><sup><sup>network/loopback/dialog.cpp</sup></sup></h1> <pre> /**************************************************************************** ** ** Copyright (C) 2004-2006 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 version 2.0 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 GNU ** General Public Licensing requirements will be met: ** http:<span class="comment">//www.trolltech.com/products/qt/opensource.html</span> ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http:<span class="comment">//www.trolltech.com/products/qt/licensing.html or contact the</span> ** sales department at sales@trolltech.com. ** ** 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(); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2006 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.2.1</div></td> </tr></table></div></address></body> </html>