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50#include <QCoreApplication>
51#include <QQmlEngine>
52#include <QQmlComponent>
53#include <QDebug>
54#include "birthdayparty.h"
55#include "happybirthdaysong.h"
56#include "person.h"
57
58int main(int argc, char ** argv)
59{
60 QCoreApplication app(argc, argv);
61
62 QQmlEngine engine;
63 QQmlComponent component(&engine, QUrl("qrc:example.qml"));
64 auto *party = qobject_cast<BirthdayParty *>(object: component.create());
65
66 if (party && party->host()) {
67 qWarning() << party->host()->name() << "is having a birthday!";
68
69 if (qobject_cast<Boy *>(object: party->host()))
70 qWarning() << "He is inviting:";
71 else
72 qWarning() << "She is inviting:";
73
74 for (int ii = 0; ii < party->guestCount(); ++ii) {
75 Person *guest = party->guest(ii);
76
77 QDate rsvpDate;
78 QObject *attached =
79 qmlAttachedPropertiesObject<BirthdayParty>(obj: guest, create: false);
80 if (attached)
81 rsvpDate = attached->property(name: "rsvp").toDate();
82
83 if (rsvpDate.isNull())
84 qWarning() << " " << guest->name() << "RSVP date: Hasn't RSVP'd";
85 else
86 qWarning() << " " << guest->name() << "RSVP date:" << qPrintable(rsvpDate.toString());
87 }
88
89 party->startParty();
90 return QCoreApplication::exec();
91 }
92
93 qWarning() << component.errors();
94 return EXIT_FAILURE;
95}
96

source code of qtdeclarative/examples/qml/referenceexamples/valuesource/main.cpp