[fusionpro] Re: Code128 covert to a human readable

[Dan Korn]

There's no specific built-in method for decoding the 128 barcode
encoding, but you could do something like this to see the checksum value
(generally the next-to-last character in the barcode string):

  var s = Make128Barcode("12345");
  return s.charCodeAt(s.length-2);

But you have to be careful, because the "character set C" encoding in
the barcode string is compressed to represent multiple ASCII characters
in each barcode character.  Also, the actual checksum value may not be
the exact code value of the character in the next-to-last position in
the barcode string because of substitutions in the Code 128 character
set.  See:
http://www.idautomation.com/code128faq.html#Code-128CharacterSet

You can also feel free to look at the source code for all of the barcode
functions in Builtins.js to see how they work.

Here's a general-purpose function that I find handy for examining
strings:

  function GetChars(str)
  {
    if (typeof(str) != "string")
      return "[not a string]";

    var result = "";
    for (var i in str)
    {
      result += i + ":\t" + str.charCodeAt(i) + "\t";
      switch (str.charCodeAt(i))
      {
      case 0:
        result += "[NULL character]";
        break;
      case 10:
        result += "[new line]";
        break;
      case 13:
        result += "[carriage return]";
        break;
      case 9:
        result += "[tab]";
        break;
      default:
        result += str[i];
      }

      result += "\n";
    }

    return result;
  }

You can use it like so:

  var s = Make128Barcode("12345");
  return GetChars(s);

And it will basically "dump" the string contents when you click
Validate.

Dan


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