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# client.cpp Example File
network/fortuneclient/client.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation 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://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
        ** 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 "client.h"

        Client::Client(QWidget *parent)
            : QDialog(parent)
        {
            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"));

            tcpSocket = new QTcpSocket(this);

            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()));
            connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune()));
            connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));

            QHBoxLayout *buttonLayout = new QHBoxLayout;
            buttonLayout->addStretch(1);
            buttonLayout->addWidget(getFortuneButton);
            buttonLayout->addWidget(quitButton);

            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->addLayout(buttonLayout, 3, 0, 1, 2);
            setLayout(mainLayout);

            setWindowTitle(tr("Fortune Client"));
            portLineEdit->setFocus();
        }

        void Client::requestNewFortune()
        {
            getFortuneButton->setEnabled(false);
            blockSize = 0;
            tcpSocket->abort();
            tcpSocket->connectToHost(hostLineEdit->text(),
                                     portLineEdit->text().toInt());
        }

        void Client::readFortune()
        {
            QDataStream in(tcpSocket);
            in.setVersion(QDataStream::Qt_4_0);

            if (blockSize == 0) {
                if (tcpSocket->bytesAvailable() < (int)sizeof(quint16))
                    return;

                in >> blockSize;
            }

            if (tcpSocket->bytesAvailable() < blockSize)
                return;

            QString nextFortune;
            in >> nextFortune;

            if (nextFortune == currentFortune) {
                QTimer::singleShot(0, this, SLOT(requestNewFortune()));
                return;
            }

            currentFortune = nextFortune;
            statusLabel->setText(currentFortune);
            getFortuneButton->setEnabled(true);
        }

        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);
        }

        void Client::enableGetFortuneButton()
        {
            getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
                                         && !portLineEdit->text().isEmpty());
        }