How to import an existing (singleton) c++ object to QML?

XaviP

Hi Qt Forum,

I'm trying to import an existing c++ object to QML. In main.cpp:

Backend backend;
QQmlApplicationEngine engine;
engine.setInitialProperties({
    { "backend", QVariant::fromValue(&backend) }
});

In backend.h:

class Backend : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    QML_SINGLETON

It's not working:

QQmlApplicationEngine failed to create component
qrc:qml/main.qml: Setting initial properties failed: ApplicationWindow does not have a property called backend

Do I need to implement this?:

static Backend* create(QQmlEngine*, QJSEngine*);

if engine is not going to instantiate it?

XaviP

Sorry, I misunderstood some concepts. Now running with:

Backend backend;
QQmlApplicationEngine engine;
engine.rootContext()->setContextProperty("backend", &backend);

class Backend : public QObject
{
    Q_OBJECT
    QML_ELEMENT