for (int path = 1; path < argc; path++) {
  QFileInfo fi(argv[path]);
  if (fi.isDir()) {
    QDir dir(argv[path], "", QDir::LocaleAware, QDir::AllEntries);
    qDebug() << dir.entryList();
    QDirIterator it(QString(argv[path]), QDirIterator::Subdirectories);
    while (it.hasNext()) {
      it.next();
      qDebug() << it.fileInfo().absoluteFilePath();
      /* Processing; irrelevant in the context of the question */
    }
  }
}

QApplication app(argc, argv);

QStringList args = app.arguments();

for(...)

const QString dirName = QString::fromLocal8Bit( argv[path] );