C++ Communication with QML

[serkan_tr]

I'm trying to get the QML side to communicate with C++ in a project. I have a class in my project and this class is called RosQml and inside this class there is a function called getButton().
I tried two ways and both times I get the same error.
c++
1-> qmlRegisterType<RosQml> ("ROSNODE", 1, 0, "Rosnode");
2-> qmlRegisterUncreatableType<RosQml> ("ROSNODE", 1, 0, "Rosnode", "Reference only");
QML

onClicked: {
    Rosnode.getButton()
}

same error in both cases
error = TypeError: Property 'getButton' of object [object Object] is not a function

[sierdzio]

By registering a type, you just make it available to the QML engine. It allows you to do this in QML:

import ROSNODE 1.0

Rosnode {
  // An instance of C++ class, created in QML!
}

If you want to create an instance of your class in C++ and use that same instance in QML ("share" the same object between QML and C++), then you need to use different approach. For example:

• add your object to root context property of your engine
• declare your object to be a QML singleton
• send the object to QML via a signal
• there are probably a few more ways

[serkan_tr]

@sierdzio this worked