su -

yum   install   qt5-qdbusviewer

qdbusviewer-qt5

.pro .... QT += core gui dbus

<code c++>
#ifndef RECEIVER_H
#define RECEIVER_H

#include <QMainWindow>

namespace Ui {
class Receiver;
}

class Receiver : public QMainWindow
{
    Q_OBJECT
    Q_CLASSINFO ("D-Bus Interface",
                 "org.example.ReceiverInterface")

public:
    explicit Receiver(QWidget *parent = 0);
    ~Receiver();

public slots:
    Q_SCRIPTABLE void hello (QString s);
    Q_SCRIPTABLE QString hello2 (QString s);

private:
    Ui::Receiver *ui;
};

#endif // RECEIVER_H

</code>

<code c++>
#include "receiver.h"
#include "ui_receiver.h"

#include <QDBusConnection>

Receiver::Receiver(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Receiver)
{
    ui->setupUi(this);

    QDBusConnection bus = QDBusConnection::sessionBus ();
    if (bus.isConnected())
        if (bus.registerService ("org.example.receiver"))
            if (bus.registerObject ("/", this,
                       QDBusConnection::ExportAllSlots))
                ui->textEdit->append ("Ready");
}

Receiver::~Receiver()
{
    delete ui;
}

void Receiver::hello (QString s)
{
    ui->textEdit->append ("Hello: " + s);
}

QString Receiver::hello2 (QString s)
{
    ui->textEdit->append ("Hello2: " + s);
    return "Answer from Receiver";
}

</code>

<code c++>
#include <QDBusConnection>
#include <QDBusInterface>

void Sender::on_actionRun_triggered()
{
    QDBusConnection bus = QDBusConnection::sessionBus();
    QDBusInterface ifc ("org.example.receiver", "/", "", bus);
    ifc.call ("hello", "Hello from Qt");
}

</code>