Calling QML functions from C++

[neda]

Hi,
I use this code in "main.cpp" and that is Ok.
But I do not know How can I use this code in another c++ class.
When I put this code in another class (for example myserialport.cpp), program does not work.

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
    QObject * object = engine.rootObjects().value(0);
 
	QVariant returnedValue;
	QVariant msg = "Hello from C++";
    QMetaObject::invokeMethod(object, "myQmlFunction",
            Q_RETURN_ARG(QVariant, returnedValue),
            Q_ARG(QVariant, msg));
 
    return app.exec();
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    QObject * object = engine.rootObjects().value(0);
    
	QVariant returnedValue;
	QVariant msg = "Hello from C++";
    QMetaObject::invokeMethod(object, "myQmlFunction",
            Q_RETURN_ARG(QVariant, returnedValue),
            Q_ARG(QVariant, msg));

    return app.exec();
}

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