Return value from JS function to CPP. How?

[bogong]

Hello all!

I know how to run JS function in QML object from CPP. Something like this in *.qml:

ACustomType1 {

	id: oCustomType1_1;
	objectName: "oCustomType1_1";

	function mTestJSFunction() {
		console.log("mTestJSFunction");
	}

	function mReturnValue() { // How to run this?
		return 1234;
	}
}

in *.cpp

QObject* oCustomType1 = oEngine.rootObjects().first()->findChild<QObject*>("oCustomType1_1");
QMetaObject::invokeMethod(oCustomType1,"mTestJSFunction");

How to run JS function in CPP and return value? Not just getting default boolean value.
This code do not working:

quint32 oReturnValue;
qRegisterMetaType<quint32>("quint32");
QMetaObject::invokeMethod(oCustomType2,"mReturnValue",Q_RETURN_ARG(quint32, oReturnValue));

It's return false in QMetaObject::invokeMethod, but when no use of Q_RETURN_ARG(quint32, oReturnValue) method called. What am I missing?

[bogong]

Solution found. issue closed.
It's working with QVariant data type, that is default for QML/JS -> CPP exchange.
This code working perfectly:

QVariant oReturnValue("no_value");
QMetaObject::invokeMethod(oCustomType2,"mReturnValue",Q_RETURN_ARG(QVariant, oReturnValue));