main.cpp Example File

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 #include <QQmlApplicationEngine>
 #include <QGuiApplication>
 #include <QCommandLineParser>
 #include <QCommandLineOption>
 #include <QWindow>
 #include <QQmlContext>
 #include <QStandardPaths>
 #include <QDir>

 int main(int argc, char *argv[])
 {
     QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
     QCoreApplication::setApplicationName(QStringLiteral("QuickPlayer"));
     QCoreApplication::setApplicationVersion(QLatin1String(QT_VERSION_STR));
     QCoreApplication::setOrganizationName(QStringLiteral("QtWinExtras"));
     QCoreApplication::setOrganizationDomain(QStringLiteral("qt-project.org"));
     QGuiApplication::setApplicationDisplayName(QStringLiteral("QtWinExtras Quick Player"));

     QQmlApplicationEngine engine;
     const QStringList musicPaths = QStandardPaths::standardLocations(QStandardPaths::MusicLocation);
     const QUrl musicUrl = QUrl::fromLocalFile(musicPaths.isEmpty() ? QDir::homePath() : musicPaths.first());
     engine.rootContext()->setContextProperty(QStringLiteral("musicUrl"), musicUrl);

     QCommandLineParser parser;
     parser.setApplicationDescription(QGuiApplication::applicationDisplayName());
     parser.addHelpOption();
     parser.addVersionOption();
     parser.addPositionalArgument(QStringLiteral("url"), QStringLiteral("The URL to open."));
     parser.process(app);
     QUrl commandLineUrl;
     if (!parser.positionalArguments().isEmpty())
         commandLineUrl = QUrl::fromUserInput(parser.positionalArguments().constFirst(), QDir::currentPath(), QUrl::AssumeLocalFile);
     engine.rootContext()->setContextProperty(QStringLiteral("url"), commandLineUrl);

     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
     QObject *root = engine.rootObjects().value(0);
     if (QWindow *window = qobject_cast<QWindow *>(root))
         window->show();
     else
         return -1;
     return app.exec();
 }