Re: How to put Start / End character to Code 128 A/B/C barcode

Hi

Sorry for the late response. As you may have read I've been away on
holidays.

The Code 128 implementation currently tries to compute the optimal
characters sets (including character set changes) for a message. You
don't have a way to directly control the character sets being used.

Do you have a use case where you need to have exact control over the
characters being encoded? If yes, you could try to experiment with the
latest code from CVS which has been improved considerably over the
version in the 0.9 release. I've introduced a Code128Encoder interface
which would allow you to plug-in your own implementation for encoding
a message (including character set control characters). The default
implementation of the interface (DefaultCode128Encoder) selects the
appropriate character sets automatically.

Example: "Code128" will be encoded as "[Start B]Code128" plus the check
digit will be added by Krysalis Barcode.

As I haven't run into any other use cases and only found one check digit
algorithm I've hardwired the check digit generation into the code.
Making this configurable as with most other symbologies wouldn't be a
great deal of work I think.

I hope this helps.

On 05.09.2003 19:56:47 Chiu Chong Kan wrote:
> I'm trying to generate Code 128 barcode in a PDF document using XSL-FP + 
> Krysalis Barcode.  I can generate barcode in Code 128 RAW format with no 
> problem.  However, for Code 128 Set A/B/C, the barcode has start/end 
> character and check digit attached.  Is it possible to do in Krysalis ?  
> For example, when I put a leading character ascii(0204) to my barcode 
> string in XML, Krysalis simply returns invalid character.  Any idea ?  
> Also, should I calculate the check digit myself or Krysalis can do it for 
> me ?  Thanks in advance.


Jeremias Maerki



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