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();
  }