ean-128/gs1-128 support? about python-barcode

[MDziwny]

Actually it can be generated with the Code128 generator by prepending the FNC1 character \xf1 to the code generated.

For instance:

import barcode

GS1_FNC1_CHAR = u'\xf1'

code = u"00123456780000000001"

code_128_creator = barcode.get_barcode_class("code128")
gs1_128_code = code_128_creator(GS1_FNC1_CHAR + code)
code = gs1_128_code.render()

[WhyNotHugo]

Fixed via #37. Version 0.10.0 released with this (and a few other) changes.

[MDziwny]

I could make a PR to make it more user friendly

[MDziwny]

From what I've read, for instance on https://www.gs1-128.info/:

In essence, GS1-128 is a derivative language of the Code 128 symbology, utilizing a flagging character (Function Code 1 (FNC1)) and application identifiers.

For the letter before the FNC1, it is already inserted by Code-128 as the first character of the code.

I will do the PR soon.

[MDziwny]

I would be very interested too.

[wellmonwu]

it is better to support ean-128 and print to doc/docx.

[wellmonwu]

I could make a PR to make it more user friendly

it would help a lot

[WhyNotHugo]

@MDziwny Are you entirely sure there's not another letter before the FNC1 character? (I'm just making sure, since I haven't come across very clear information).

In any case, a PR is more than welcome. A subclass that wraps around the current code128 renderer should work fine, so if you want to address it, I'll be happy to merge it in. Thanks!