Re: [Barcode4j-users] checksum for 3of9

[Jeremias M. <dev...@gr...>]

On 17.10.2004 05:08:27 Jeff and Jana Moore wrote:
> How is the checksum suppose to work?  Am I suppose to supply the
> checksum value or do you automatically
> add it to the human readable text?   I'm using FOP to generate the PDF
> and want a barcode to display at the
> bottom of the page with a checksum value. 

There are different checksum modes. You can let Barcode4J calculate the
checksums for you, it can check them and it can simply ignore them.

See here:
http://barcode4j.krysalis.org/barcode-xml.html#Code+39
(also look for the description of the "checksum-mode" Datatype further
up the page)

> In addition, I've seen other barcodes that display the asterisks as the
> start/stop character.  
> Is there a way to display the asterisks? 

Not at the moment. They are currently illegal in the message but are
automatically added internally furing generation. I wanted to finalize
the release of Barcode4J today but your post made me rethink the whole
human-readable part stuff. I realized that it's not very consistent
through all symbologies. I'll have to go over it once more.

I hope that helps.

Jeremias Maerki