C++ 调用QML中的 function

 Item {
     function say(text) {
         console.log("You said " + text);
     }
 }


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  QDeclarativeEngine engine;
      *context = new (engine.rootContext());
      component(&engine, ::fromLocalFile("main.qml"));
      *object = component.(context);
      str("Hello");
     QMetaObject::invokeMethod(object, "say", Q_ARG(QVariant, str));