QQmlContext: Cannot set property on invalid context

WhatIf

Hi,

I keep receiving

QQmlContext: Cannot set property on invalid context.
QQmlComponent: Cannot create a component in an invalid context

when component.create(); in the following code is executed.

void MainWindow::on_openMapBtn_clicked()
{
    QQmlEngine engine;
    QMLCommunicationAgent agent;
    engine.rootContext()->setContextProperty("agent", &agent);
    QQmlComponent component(&engine, QUrl::fromLocalFile("map.qml"));
    component.create();
}

What am I doing wrong?

p3c0

@WhatIf As per the code here the engine and its context object should be valid when the component is being created. I think you can try 2 things:

create QQmlEngine and QMLCommunicationAgent on heap using new
force QQmlComponent::PreferSynchronous in QQmlComponent