Using QQmlContext::setContextObject to make a C++ object visible to QML - c++

Question

Edit: Problem solved. See my edit below
I am having trouble using QQmlContext::setContextObject to make a C++ object visible to QML. I have read the documentation for QQmlContext at link, which suggests that I can use setContextObject to make the Q_PROPERTY's of a QObject-derived class visible to QML. The following code illustrates the problem.
main.cpp
#include <QObject>
#include <QQmlEngine>
#include <QGuiApplication>
class MyClass : public QObject
{
Q_OBJECT
Q_PROPERTY(QString myProperty READ prop NOTIFY propChanged)
public:
MyClass(QObject * parent = 0) : QObject(parent) {}
QString prop() { return QString("Hello from MyClass"); }
Q_SIGNALS:
void propChanged(void);
};
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQmlEngine engine;
QQmlContext *objectContext = new QQmlContext(engine.rootContext());
MyClass myClass;
objectContext->setContextObject(&myClass);
QQmlComponent component(&engine, "main.qml");
QObject *object = component.create(objectContext);
return app.exec();
}
main.qml
import QtQuick 2.1
import QtQuick.Controls 1.0
ApplicationWindow
{
Text
{
text: myProperty
}
}
When I run this program I get the error
file:///C:/Path/to/main.qml:8: ReferenceError: myProperty is not defined
Thank you in advance for any help.
Environment. I am using Qt 5.1.1 on Windows 7, with MSVC2010 compiler
Edit. Answering my own question. A clean rebuild showed that my build output folder clearly had some out-of-date objects in it.
One point of note: MyClass has to be in a separate file, or else the moc compiler cannot do its magic.
My tidied-up main.cpp now looks like this
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQmlEngine engine;
QQmlContext * context = new QQmlContext(engine.rootContext());
QObject::connect(&engine, SIGNAL(quit()), QCoreApplication::instance(), SLOT(quit ()));
MyClass myClass;
context->setContextObject(&myClass);
QQmlComponent component(&engine, "main.qml");
QQuickWindow * topLevel = qobject_cast<QQuickWindow*>(component.create(context));
topLevel->show();
int rc = app.exec();
delete topLevel;
delete context;
return rc;
}

Answer 1

You can try to add Q_INVOKABLE macro in you getter function decalration. If it will not help you can consider using QQmlContext::setContextProperty to do this. I have never seen that somebody is doing this kind of integration using ::setContextObject.