main.cpp Example File

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 #include "musicplayer.h"

 #include <QApplication>
 #include <QCommandLineParser>
 #include <QCommandLineOption>
 #include <QDesktopWidget>
 #include <QFileInfo>
 #include <QMimeDatabase>
 #include <QSettings>
 #include <QIcon>
 #include <QDir>
 #include <QUrl>

 static bool associateFileTypes()
 {
     QString displayName = QGuiApplication::applicationDisplayName();
     QString filePath = QCoreApplication::applicationFilePath();
     QString fileName = QFileInfo(filePath).fileName();

     const QString key = QStringLiteral("HKEY_CURRENT_USER\\Software\\Classes\\Applications\\") + fileName;
     QSettings settings(key, QSettings::NativeFormat);
     if (settings.status() != QSettings::NoError) {
         qWarning() << "Cannot access registry key" << key;
         return false;
     }
     settings.setValue(QStringLiteral("FriendlyAppName"), displayName);

     settings.beginGroup(QStringLiteral("SupportedTypes"));
     QMimeDatabase mimeDatabase;
     const QStringList supportedMimeTypes = MusicPlayer::supportedMimeTypes();
     for (const QString &fileType : supportedMimeTypes) {
         const QStringList suffixes = mimeDatabase.mimeTypeForName(fileType).suffixes();
         for (QString suffix : suffixes) {
             suffix.prepend('.');
             settings.setValue(suffix, QString());
         }
     }
     settings.endGroup();

     settings.beginGroup(QStringLiteral("shell"));
     settings.beginGroup(QStringLiteral("open"));
     settings.setValue(QStringLiteral("FriendlyAppName"), displayName);
     settings.beginGroup(QStringLiteral("Command"));
     settings.setValue(QStringLiteral("."),
                       QLatin1Char('"') + QDir::toNativeSeparators(filePath) + QStringLiteral("\" \"%1\""));

     return true;
 }

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

     if (!associateFileTypes())
         return -1;

     QCommandLineParser parser;
     parser.setApplicationDescription(QGuiApplication::applicationDisplayName());
     parser.addHelpOption();
     parser.addVersionOption();
     parser.addPositionalArgument(QStringLiteral("url"), MusicPlayer::tr("The URL to open."));
     parser.process(app);

     MusicPlayer player;

     if (!parser.positionalArguments().isEmpty())
         player.playUrl(QUrl::fromUserInput(parser.positionalArguments().constFirst(), QDir::currentPath(), QUrl::AssumeLocalFile));

     const QRect availableGeometry = QApplication::desktop()->availableGeometry(&player);
     player.resize(availableGeometry.width() / 6, availableGeometry.height() / 17);
     player.show();

     return app.exec();
 }