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

    #include <QtGui>
    #include <QtNetwork>

    #include "client.h"

    Client::Client(QWidget *parent)
        : QDialog(parent)
    {
        hostLabel = new QLabel(tr("&Server name:"), this);
        portLabel = new QLabel(tr("S&erver port:"), this);

        hostLineEdit = new QLineEdit("Localhost", this);
        portLineEdit = new QLineEdit(this);
        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."), this);

        getFortuneButton = new QPushButton(tr("Get Fortune"), this);
        getFortuneButton->setDefault(true);
        getFortuneButton->setEnabled(false);

        quitButton = new QPushButton(tr("Quit"), this);

        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(int)), this, SLOT(displayError(int)));

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

        QGridLayout *mainLayout = new QGridLayout(this);
        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);

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

    void Client::requestNewFortune()
    {
        blockSize = 0;
        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() < sizeof(Q_UINT16))
                return;

            in >> blockSize;
        }

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

        QString nextFortune;
        in >> nextFortune;
        if (nextFortune == currentFortune) {
            requestNewFortune();
            return;
        }

        currentFortune = nextFortune;
        statusLabel->setText(currentFortune);
    }

    void Client::displayError(int socketError)
    {
        switch (socketError) {
        case Qt::HostNotFoundError:
            QMessageBox::information(this, tr("Fortune Client"),
                                     tr("The host was not found. Please check the "
                                        "host name and port settings."));
            break;
        case Qt::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()));
        }
    }

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


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Qt 4.0.0-b1