- Qt 5.5
- Qt D-Bus
- D-Bus Complex Ping Pong Example
- complexpong.cpp Example File
- Qt 5.5.1 Reference Documentation

# complexpong.cpp Example File

complexpingpong/complexpong.cpp

    /****************************************************************************
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    ** Contact: http://www.qt.io/licensing/
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    ** This file is part of the examples of the Qt Toolkit.
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    #include <stdio.h>
    #include <stdlib.h>

    #include <QtCore/QCoreApplication>
    #include <QtCore/QTimer>
    #include <QtDBus/QtDBus>

    #include "ping-common.h"
    #include "complexpong.h"

    // the property
    QString Pong::value() const
    {
        return m_value;
    }

    void Pong::setValue(const QString &newValue)
    {
        m_value = newValue;
    }

    void Pong::quit()
    {
        QTimer::singleShot(0, QCoreApplication::instance(), SLOT(quit()));
    }

    QDBusVariant Pong::query(const QString &query)
    {
        QString q = query.toLower();
        if (q == "hello")
            return QDBusVariant("World");
        if (q == "ping")
            return QDBusVariant("Pong");
        if (q.indexOf("the answer to life, the universe and everything") != -1)
            return QDBusVariant(42);
        if (q.indexOf("unladen swallow") != -1) {
            if (q.indexOf("european") != -1)
                return QDBusVariant(11.0);
            return QDBusVariant(QByteArray("african or european?"));
        }

        return QDBusVariant("Sorry, I don't know the answer");
    }

    int main(int argc, char **argv)
    {
        QCoreApplication app(argc, argv);

        QObject obj;
        Pong *pong = new Pong(&obj);
        pong->connect(&app, SIGNAL(aboutToQuit()), SIGNAL(aboutToQuit()));
        pong->setProperty("value", "initial value");
        QDBusConnection::sessionBus().registerObject("/", &obj);

        if (!QDBusConnection::sessionBus().registerService(SERVICE_NAME)) {
            fprintf(stderr, "%s\n",
                    qPrintable(QDBusConnection::sessionBus().lastError().message()));
            exit(1);
        }

        app.exec();
        return 0;
    }