public Object[] getReaders() {
        Object[] readers = null;

        try {
            readers = PCSCManager.getTerminalsList().toArray();
        } catch (CardException e) {
            JOptionPane.showMessageDialog(null, "Nenhuma leitora instalada",
                    "Erro", JOptionPane.ERROR_MESSAGE);
            System.exit(0);
        }

        return readers;
    }