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su -

yum install qt5-qdbusviewer

qdbusviewer-qt5

.pro …. QT += core gui dbus

#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

#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";
}

#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");
}