//! [0]
        class MainApplicationAdaptor: public QDBusAbstractAdaptor
        {
            Q_OBJECT
            Q_CLASSINFO("D-Bus Interface", "org.kde.DBus.MainApplication")
            Q_PROPERTY(QString caption READ caption WRITE setCaption)
            Q_PROPERTY(QString organizationName READ organizationName)
            Q_PROPERTY(QString organizationDomain READ organizationDomain)

        private:
            QApplication *app;

        public:
            MainApplicationAdaptor(QApplication *application)
                : QDBusAbstractAdaptor(application), app(application)
            {
                connect(application, SIGNAL(aboutToQuit()), SIGNAL(aboutToQuit()));
                connect(application, SIGNAL(focusChanged(QWidget*, QWidget*)),
                        SLOT(focusChangedSlot(QWidget*, QWidget*)));
            }

            QString caption()
            {
                if (app->hasMainWindow())
                    return app->mainWindow()->caption();
                return QString(""); // must not return a null QString
            }

            void setCaption(const QString &newCaption)
            {
                if (app->hasMainWindow())
                    app->mainWindow()->setCaption(newCaption);
            }

            QString organizationName()
            {
                return app->organizationName();
            }

            QString organizationDomain()
            {
                return app->organizationDomain();
            }

        public slots:
            Q_NOREPLY void quit()
            { app->quit(); }

            void reparseConfiguration()
            { app->reparseConfiguration(); }

            QString mainWindowObject()
            {
                if (app->hasMainWindow())
                    return QString("/%1/mainwindow").arg(app->applicationName());
                return QString();
            }

            void setSessionManagement(bool enable)
            {
                if (enable)
                   app->enableSessionManagement();
                else
                   app->disableSessionManagement();
            }

        private slots:
            void focusChangedSlot(QWidget *, QWidget *now)
            {
                if (now == app->mainWindow())
                    emit mainWindowHasFocus();
            }

        signals:
            void aboutToQuit();
            void mainWindowHasFocus();
        };
//! [0]


//! [1]
interface org.kde.DBus.MainApplication
{
    property readwrite STRING caption
    property read STRING organizationName
    property read STRING organizationDomain

    method quit() annotation("org.freedesktop.DBus.Method.NoReply", "true")
    method reparseConfiguration()
    method mainWindowObject(out STRING)
    method disableSessionManagement(in BOOLEAN enable)

    signal aboutToQuit()
    signal mainWindowHasFocus()
}
//! [1]


//! [2]
int main(int argc, char **argv)
{
    // create the QApplication object
    QApplication app(argc, argv);

    // create the MainApplication adaptor:
    new MainApplicationAdaptor(app);

    // connect to D-Bus and register as an object:
    QDBusConnection::sessionBus().registerObject("/MainApplication", app);

    // add main window, etc.
    [...]

    app.exec();
}
//! [2]


//! [3]
class MainApplicationAdaptor: public QDBusAbstractAdaptor
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "org.kde.DBus.MainApplication")
//! [3]


//! [4]
    Q_PROPERTY(QString caption READ caption WRITE setCaption)
    Q_PROPERTY(QString organizationName READ organizationName)
    Q_PROPERTY(QString organizationDomain READ organizationDomain)
//! [4]


//! [5]
QString caption()
{
    if (app->hasMainWindow())
        return app->mainWindow()->caption();
    return QString();
}

void setCaption(const QString &newCaption)
{
    if (app->hasMainWindow())
        app->mainWindow()->setCaption(newCaption);
}

QString organizationName()
{
    return app->organizationName();
}

QString organizationDomain()
{
    return app->organizationDomain();
}
//! [5]


//! [6]
MyInterfaceAdaptor(QApplication *application)
    : QDBusAbstractAdaptor(application), app(application)
{
    connect(application, SIGNAL(aboutToQuit()), SIGNAL(aboutToQuit());
    connect(application, SIGNAL(focusChanged(QWidget*, QWidget*)),
            SLOT(focusChangedSlot(QWidget*, QWidget*)));
}
//! [6]


//! [7]
public slots:
    Q_NOREPLY void quit()
    { app->quit(); }

    void reparseConfiguration()
    { app->reparseConfiguration(); }

    QString mainWindowObject()
    {
        if (app->hasMainWindow())
            return QString("/%1/mainwindow").arg(app->applicationName());
        return QString();
    }

    void setSessionManagement(bool enable)
    {
        if (enable)
           app->enableSessionManagement();
        else
           app->disableSessionManagement();
    }
//! [7]


//! [8]
signals:
    void aboutToQuit();
    void mainWindowHasFocus();
//! [8]


//! [9]
private slots:
    void focusChangedSlot(QWidget *, QWidget *now)
    {
        if (now == app->mainWindow())
            emit mainWindowHasFocus();
    }
//! [9]


//! [10]
struct RequestData
{
    QString request;
    QString processedData;
    QDBusMessage reply;
};

QString processRequest(const QString &request, const QDBusMessage &message)
{
    RequestData *data = new RequestData;
    data->request = request;
    message.setDelayedReply(true);
    data->reply = message.createReply();
    QDBusConnection::sessionBus().send(data->reply);

    appendRequest(data);
    return QString();
}
//! [10]


//! [11]
void sendReply(RequestData *data)
{
    // data->processedData has been initialized with the request's reply
    QDBusMessage &reply = &data->reply;

    // send the reply over D-Bus:
    reply << data->processedData;
    QDBusConnection::sessionBus().send(reply);

    // dispose of the transaction data
    delete data;
}
//! [11]


//! [12]
Q_NOREPLY void myMethod();
//! [12]