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Diffstat (limited to 'examples/network/fortuneclient/client.cpp')
| -rw-r--r-- | examples/network/fortuneclient/client.cpp | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/examples/network/fortuneclient/client.cpp b/examples/network/fortuneclient/client.cpp new file mode 100644 index 0000000000..9eab1c2371 --- /dev/null +++ b/examples/network/fortuneclient/client.cpp @@ -0,0 +1,252 @@ +/**************************************************************************** +** +** 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 "client.h" + +//! [0] +Client::Client(QWidget *parent) +: QDialog(parent), networkSession(0) +{ +//! [0] + hostLabel = new QLabel(tr("&Server name:")); + portLabel = new QLabel(tr("S&erver port:")); + + // find out which IP to connect to + QString ipAddress; + QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); + // use the first non-localhost IPv4 address + for (int i = 0; i < ipAddressesList.size(); ++i) { + if (ipAddressesList.at(i) != QHostAddress::LocalHost && + ipAddressesList.at(i).toIPv4Address()) { + ipAddress = ipAddressesList.at(i).toString(); + break; + } + } + // if we did not find one, use IPv4 localhost + if (ipAddress.isEmpty()) + ipAddress = QHostAddress(QHostAddress::LocalHost).toString(); + + hostLineEdit = new QLineEdit(ipAddress); + portLineEdit = new QLineEdit; + portLineEdit->setValidator(new QIntValidator(1, 65535, this)); + + hostLabel->setBuddy(hostLineEdit); + portLabel->setBuddy(portLineEdit); + + statusLabel = new QLabel(tr("This examples requires that you run the " + "Fortune Server example as well.")); + + getFortuneButton = new QPushButton(tr("Get Fortune")); + getFortuneButton->setDefault(true); + getFortuneButton->setEnabled(false); + + quitButton = new QPushButton(tr("Quit")); + + buttonBox = new QDialogButtonBox; + buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); + buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); + +//! [1] + tcpSocket = new QTcpSocket(this); +//! [1] + + connect(hostLineEdit, SIGNAL(textChanged(QString)), + this, SLOT(enableGetFortuneButton())); + connect(portLineEdit, SIGNAL(textChanged(QString)), + this, SLOT(enableGetFortuneButton())); + connect(getFortuneButton, SIGNAL(clicked()), + this, SLOT(requestNewFortune())); + connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); +//! [2] //! [3] + connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune())); +//! [2] //! [4] + connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)), +//! [3] + this, SLOT(displayError(QAbstractSocket::SocketError))); +//! [4] + + QGridLayout *mainLayout = new QGridLayout; + mainLayout->addWidget(hostLabel, 0, 0); + mainLayout->addWidget(hostLineEdit, 0, 1); + mainLayout->addWidget(portLabel, 1, 0); + mainLayout->addWidget(portLineEdit, 1, 1); + mainLayout->addWidget(statusLabel, 2, 0, 1, 2); + mainLayout->addWidget(buttonBox, 3, 0, 1, 2); + setLayout(mainLayout); + + setWindowTitle(tr("Fortune Client")); + portLineEdit->setFocus(); + + QNetworkConfigurationManager manager; + if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired) { + // Get saved network configuration + QSettings settings(QSettings::UserScope, QLatin1String("Trolltech")); + settings.beginGroup(QLatin1String("QtNetwork")); + const QString id = settings.value(QLatin1String("DefaultNetworkConfiguration")).toString(); + settings.endGroup(); + + // If the saved network configuration is not currently discovered use the system default + QNetworkConfiguration config = manager.configurationFromIdentifier(id); + if ((config.state() & QNetworkConfiguration::Discovered) != + QNetworkConfiguration::Discovered) { + config = manager.defaultConfiguration(); + } + + networkSession = new QNetworkSession(config, this); + connect(networkSession, SIGNAL(opened()), this, SLOT(sessionOpened())); + + getFortuneButton->setEnabled(false); + statusLabel->setText(tr("Opening network session.")); + networkSession->open(); + } +//! [5] +} +//! [5] + +//! [6] +void Client::requestNewFortune() +{ + getFortuneButton->setEnabled(false); + blockSize = 0; + tcpSocket->abort(); +//! [7] + tcpSocket->connectToHost(hostLineEdit->text(), + portLineEdit->text().toInt()); +//! [7] +} +//! [6] + +//! [8] +void Client::readFortune() +{ +//! [9] + QDataStream in(tcpSocket); + in.setVersion(QDataStream::Qt_4_0); + + if (blockSize == 0) { + if (tcpSocket->bytesAvailable() < (int)sizeof(quint16)) + return; +//! [8] + +//! [10] + in >> blockSize; + } + + if (tcpSocket->bytesAvailable() < blockSize) + return; +//! [10] //! [11] + + QString nextFortune; + in >> nextFortune; + + if (nextFortune == currentFortune) { + QTimer::singleShot(0, this, SLOT(requestNewFortune())); + return; + } +//! [11] + +//! [12] + currentFortune = nextFortune; +//! [9] + statusLabel->setText(currentFortune); + getFortuneButton->setEnabled(true); +} +//! [12] + +//! [13] +void Client::displayError(QAbstractSocket::SocketError socketError) +{ + switch (socketError) { + case QAbstractSocket::RemoteHostClosedError: + break; + case QAbstractSocket::HostNotFoundError: + QMessageBox::information(this, tr("Fortune Client"), + tr("The host was not found. Please check the " + "host name and port settings.")); + break; + case QAbstractSocket::ConnectionRefusedError: + QMessageBox::information(this, tr("Fortune Client"), + tr("The connection was refused by the peer. " + "Make sure the fortune server is running, " + "and check that the host name and port " + "settings are correct.")); + break; + default: + QMessageBox::information(this, tr("Fortune Client"), + tr("The following error occurred: %1.") + .arg(tcpSocket->errorString())); + } + + getFortuneButton->setEnabled(true); +} +//! [13] + +void Client::enableGetFortuneButton() +{ + getFortuneButton->setEnabled((!networkSession || networkSession->isOpen()) && + !hostLineEdit->text().isEmpty() && + !portLineEdit->text().isEmpty()); + +} + +void Client::sessionOpened() +{ + // Save the used configuration + QNetworkConfiguration config = networkSession->configuration(); + QString id; + if (config.type() == QNetworkConfiguration::UserChoice) + id = networkSession->sessionProperty(QLatin1String("UserChoiceConfiguration")).toString(); + else + id = config.identifier(); + + QSettings settings(QSettings::UserScope, QLatin1String("Trolltech")); + settings.beginGroup(QLatin1String("QtNetwork")); + settings.setValue(QLatin1String("DefaultNetworkConfiguration"), id); + settings.endGroup(); + + statusLabel->setText(tr("This examples requires that you run the " + "Fortune Server example as well.")); + + enableGetFortuneButton(); +} + |