" Input: { string - string to convert to qr-code (qr_level) - qr_level (default=3) (image_size) - picture size (default=512) (image_type) - picture type (default=PNG) (web) - if 'yes', return as web output (filename) - file to write (if not web) (default - qr-code.png) } Output: { return - return code = 0, if successful > 0, if error (error) - error text if return > 0 full_filename - file with image } "