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Diffstat (limited to 'examples/network/fortuneclient/client.cpp')
| -rw-r--r-- | examples/network/fortuneclient/client.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/examples/network/fortuneclient/client.cpp b/examples/network/fortuneclient/client.cpp new file mode 100644 index 0000000..4d65828 --- /dev/null +++ b/examples/network/fortuneclient/client.cpp @@ -0,0 +1,191 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> +#include <QtNetwork> + +#include "client.h" + +//! [0] +Client::Client(QWidget *parent) + : QDialog(parent) +{ +//! [0] + hostLabel = new QLabel(tr("&Server name:")); + portLabel = new QLabel(tr("S&erver port:")); + + hostLineEdit = new QLineEdit("Localhost"); + 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(const QString &)), + this, SLOT(enableGetFortuneButton())); + connect(portLineEdit, SIGNAL(textChanged(const 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(); +//! [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(!hostLineEdit->text().isEmpty() + && !portLineEdit->text().isEmpty()); +} |