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();
}

I want to change source icon of toolbutton, show dialog with specific message , change value of several property and enable or disable controls (TextField,GroupBox , ....) on the QML side from C++.
I have this code in "MySerialPort" class:

void MySerialPort::readData()
{
	QByteArray data = serial->readAll();
	if(data[0]=='0') // For example
		Show qml dialog
	if(data[1]=='1') // For example
	   disable GroupBox	

...
...
}

Is there any solution to handling this code on the QML side?

xargs1

From the C++ code, emit a signal based on what you've read from the serial port. The QML code catches the signals and does whatever is appropriate.