Getting Started Programming with Qt Quick

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 #include <QGuiApplication>
 #include <QQmlApplicationEngine>

 int main(int argc, char *argv[])
 {
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

     QGuiApplication app(argc, argv);

     QQmlApplicationEngine engine;
     const QUrl url(u"qrc:/alarms/main.qml"_qs);
     QObject::connect(&engine, &QQmlApplicationEngine::objectCreated, &app,
                      [url](QObject *obj, const QUrl &objUrl) {
                          if (!obj && url == objUrl)
                              QCoreApplication::exit(-1);
                      },
                      Qt::QueuedConnection);
     engine.load(url);

     return app.exec();
 }