main.cpp Example File

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 #include <QCoreApplication>
 #include <QDeclarativeEngine>
 #include <QDeclarativeComponent>
 #include <QDebug>
 #include "birthdayparty.h"
 #include "happybirthdaysong.h"
 #include "person.h"

 int main(int argc, char ** argv)
 {
     QCoreApplication app(argc, argv);

     qmlRegisterType<BirthdayPartyAttached>();
     qmlRegisterType<BirthdayParty>("People", 1,0, "BirthdayParty");
     qmlRegisterType<HappyBirthdaySong>("People", 1,0, "HappyBirthdaySong");
     qmlRegisterType<ShoeDescription>();
     qmlRegisterType<Person>();
     qmlRegisterType<Boy>("People", 1,0, "Boy");
     qmlRegisterType<Girl>("People", 1,0, "Girl");

     QDeclarativeEngine engine;
     QDeclarativeComponent component(&engine, QUrl("qrc:example.qml"));
     BirthdayParty *party = qobject_cast<BirthdayParty *>(component.create());

     if (party && party->host()) {
         qWarning() << party->host()->name() << "is having a birthday!";

         if (qobject_cast<Boy *>(party->host()))
             qWarning() << "He is inviting:";
         else
             qWarning() << "She is inviting:";

         for (int ii = 0; ii < party->guestCount(); ++ii) {
             Person *guest = party->guest(ii);

             QDate rsvpDate;
             QObject *attached =
                 qmlAttachedPropertiesObject<BirthdayParty>(guest, false);
             if (attached)
                 rsvpDate = attached->property("rsvp").toDate();

             if (rsvpDate.isNull())
                 qWarning() << "   " << guest->name() << "RSVP date: Hasn't RSVP'd";
             else
                 qWarning() << "   " << guest->name() << "RSVP date:" << qPrintable(rsvpDate.toString());
         }

         party->startParty();
     } else {
         qWarning() << component.errors();
     }

     return app.exec();
 }