Newbie : pass C++ instances to QML

[sebastienc]

Hello,

I would like to know if it is possible to instantiate an object in C++ (which exposes properties with Q_PROPERTY) and to use this object instantiated in C++ in a QML context.

I know that to use a C++ object in QML, I have to use qmlRegisterType but I don't want to do instantiation in QML.

Thanks for your help

sc

[ODБOï]

@sebastienc hi
here is an overview of QML / c++ integration methods
looks like you need this one

[J.Hilk]

@sebastienc sure
in your particular case:
https://doc.qt.io/qt-5/qqmlengine.html#qmlRegisterSingletonInstance

[sebastienc]

Thank you, it seems to suit my needs.

Is there an equivalent with qt 5.11 as this method was introduced in qt 5.14 ?

[Bob64]

@sebastienc For older Qt, I think this is what you need:

qmlEngine->rootContext()->setContextProperty("myobj", myCppObjInstance);

Your object will be accessible via the global myobj property (or whatever you want to call it) in your QML.

Obviously, your C++ object has to be a QObject and have QML-compatible members exposed on it (e.g. Q_INVOKABLE methods and/or Q_PROPERTY members) to be useful.

[sebastienc]

@Bob64 Perfect !