> I am trying to figure out how to encode and decode barcodes, the ones
> listed in the subject line --- code 128 and pdf417.
I don't believe you can get the pdf417 spec for free. Here's a link to where
you can order it:
http://www.symbol.com/products/barcode_scanners/2d_about_2d_standards.html
I've also read some Hewlett Packard application notes some years ago that gave
the encoding formats for common 1-D barcodes. You might search the HP
(Agilent?) website.
--PH
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