Bar code generation & readin

Sarah Reichelt sarah.reichelt at gmail.com
Tue Feb 27 17:30:30 EST 2007


On 2/28/07, Mikey <mikeythek at gmail.com> wrote:
> Sarah,
>
> The easiest way to generate a barcode using a font in Code 39 is to:
>
> 1) Make sure you have the prefix and postfix characters appended.  For
> Code 39 that's an asterisk.  Your reader will eat this character, so
> it won't display when you scan it.
>
> 2) Figure out if your reader is requiring a checksum.  If it is, email
> me privately and I'll send you the algorithm.
>
> 3) Figure out what Code 39 characters and symbology you need.  The
> place to start is to make a number to encode.  Try 12345...except to
> make it code 39 you have to use *12345* (assuming no checksum).  After
> you can verify that this works, then you have to decide if you want
> the full ASCII character set to be encodable, or just a subset
> (uppercase alpha characters, number, and a couple of symbols).  Email
> me privately for more on this as well so we make sure that you are
> properly encoding your string.
>

Thanks for this info Mike. It was actually Peter who needed it, not me
as I am happy using Code128. However I assume that once you have
constructed your string, you then display it using a barcode font? At
least that it how I do my Code128 barcodes. I wonder if Peter has a
correct font?

Sarah



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