public static function run($dataDir = null)
 {
     # Instantiate barcode object
     $symbology = new Symbology();
     $bb = new BarCodeBuilder("TEXT", $symbology->Code128);
     # Set the FilledBars property to false
     $bb->setFilledBars(false);
     $bb->save($dataDir . "GenerateBarcodeWithEmptyBars.jpg");
     # Display Status.
     print "Generate Barcode With Empty Bars, please check the output file." . PHP_EOL;
 }