Creating a start dialog to set options which functionalities to load - second QQmlApplicationEngine?

robro

Hello,

I have a program which can access hardware or can be used as a file reader without hardware.

I would like to show the user a QML dialog at software start to select whether the software shall run in hardware access mode or file reader mode. And then afterwards I would like to create instances of the necessary classes and set the right context properties in my main.cpp.

How can I achieve this?
I thought about creating two QQmlApplication engines.
The first one asks the user, sets a variable which mode shall be used and is then closed.
Then the necessary classes would be instantiated, registered and the main QQmlApplicationEngine would load.

Is there another good way?
If I would try it like described, my question is, how can I make my Code in my main.cpp wait until the first engine is closed (engine.load() is not blocking)?

Thank you very much :-)

Diracsbracket

@robro

Would something like the following work:

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

    engine = new QQmlApplicationEngine();
    //setup engine for app1
    //...
    //Setup C++ to get values back from engine
    //...
    engine->load(QUrl(QStringLiteral("qrc:/main1.qml")));

    if (engine->rootObjects().isEmpty())
        return -1;

    int a = app.exec();
    qDebug() << "Ended App 1 with result: " << a;
    delete(engine);

    engine = new QQmlApplicationEngine();
    //Setup engine for app2
    //...
    engine->load(QUrl(QStringLiteral("qrc:/main2.qml")));

    if (engine->rootObjects().isEmpty())
        return -1;

    int b = app.exec();
    qDebug() << "Ended App 2 with result: " << b;

    delete(engine);
    return b;
}

robro

Thank you very much!