QQmlApplicationEngine failed to load component qrc:/main.qml: Invalid attached object assignment

[mhoggan]

Given my thoughts below am I barking up the wrong tree? Or provided the information below am I misusing the API to get the error in the title?

I am trying to modify the sample at http://doc.qt.io/qt-5/qtquick-scenegraph-openglunderqml-example.html to work with the default QtQuick project generated with Qt Creator 3.3.0 (opensource)
Based on Qt 5.4.0 (GCC 4.6.1, 64 bit).

After looking through the code the first thing that stands out to me is:

The samples main.cpp uses:
@
qmlRegisterType<Squircle>("OpenGLUnderQML", 1, 0, "Squircle");

QQuickView view;
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.setSource(QUrl("qrc:///scenegraph/openglunderqml/main.qml"));
view.show();

@

With some renaming my main.cpp uses

@
qmlRegisterType<MainScreen>("OpenGLUnderQML", 1, 0, "MainScreen");

QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

@

I am not sure if the difference in using a QQmlApplicationEngine over a QuickView could be causing my error:

@
QQmlApplicationEngine failed to load component
qrc:/main.qml:23 Invalid attached object assignment
@

Where my main.qml looks like:

@
import QtQuick 2.4
import QtQuick.Window 2.2
import OpenGLUnderQML 1.0

import "qmlmodel"

Window {
id: mainWindow
width: 800
height: 600
visible: true
color: "black"
title: "Army Calculator"
objectName: "mainWindow"

ListView {
    id: mainListView
    anchors.fill: parent
    objectName: "mainListView"
}

MainScreen {
    SequentialAnimation on DeltaT {
        NumberAnimation { to: 1; duration: 2500; easing.type: Easing.InQuad }
        NumberAnimation { to: 0; duration: 2500; easing.type: Easing.OutQuad }
        loops: Animation.Infinite
        running: true
    }
}

}
@

and the sample uses:

@
import QtQuick 2.0
import OpenGLUnderQML 1.0

Item {

width: 320
height: 480

Squircle {
    SequentialAnimation on t {
        NumberAnimation { to: 1; duration: 2500; easing.type: Easing.InQuad }
        NumberAnimation { to: 0; duration: 2500; easing.type: Easing.OutQuad }
        loops: Animation.Infinite
        running: true
    }
}
Rectangle {
    color: Qt.rgba(1, 1, 1, 0.7)
    radius: 10
    border.width: 1
    border.color: "white"
    anchors.fill: label
    anchors.margins: -10
}

Text {
    id: label
    color: "black"
    wrapMode: Text.WordWrap
    text: "The background here is a squircle rendered with raw OpenGL using the 'beforeRender()' signal in QQuickWindow. This text label and its border is rendered using QML"
    anchors.right: parent.right
    anchors.left: parent.left
    anchors.bottom: parent.bottom
    anchors.margins: 20
}

}@

[p3c0]

Hi,

Have you renamed the Squircle class to MainScreen ?