Function Characters? about iec16022

[rdoeffinger]

Sorry, was wrong. Those specifications are truly horrible.
I added a --gs1 flag that adds a proper FNC1 at the start. It also removes any possible ]d2 identifier at the start.
FNC1 in the middle still won't work, at least if they need to be encoded as FNC1 (some specs talk about using the GS ASCII code instead, but it is unclear if that is only the representation on the DataMatrix decoder output side or if it is allowed inside the DataMatrix code).

[rdoeffinger]

As far as I can tell FNC1 is simply a byte of the value 232.
So all you need to do is pass it a string with that.
On Linux, something like this should do it: ./iec16022 -f UTF-8 "$(printf \xE8test)"
I don't have reader that understands GS1 data matrix though to check.

[Rex-On-GitHub]

Thanks for your response rdoeffinger.

I see that I am running 2.4, so I do not have the UTF-8 format. I am having trouble using make on my linux distro with the source code I downloaded from the releases page. Attempting to follow the INSTALL directions, I simply type
"make" which results in "make: *** No targets specified and no makefile found. Stop."
or
"make -f Makefile.am" which results in "make: *** No targets. Stop."

Obviously I have never ran make before. Am I performing the install incorrectly?

In the meantime, I know that this site identifies the FNC1 and notes the DataMatrix as a GS1 code if you want to test your output before I get through the install: https://online-barcode-reader.inliteresearch.com/default.aspx .

Thanks for your help.
Rex

[rdoeffinger]

You don't need the UTF-8 output, it's just more convenient than having to use an image viewer to see and test the result.
Due to the numerous and somewhat serious bugs you'll probably want to use a newer version anyway though.
I fixed the instructions, in particular autogen.sh and configure were missing. I hate autotools and the extra complexity they create but I don't want to replace the build system for now.
In addition my comment was wrong. The GS1 specification is a mess. FNC1 is encoded as byte value 29 (\x1D), however that only applies if it is used as a separator.
A FNC1 at the start is simply encoded as ]d2.
Thus encoding the string "]d200123456780000000001" results in a GS1 datamatrix.

[Rex-On-GitHub]

Wow! Thanks rdoeffinger! I was able to update to the master file with your updated install doc (I did not have any of the autotools installed). You definitely have the GS1 tag working, thanks! I will do some attempts for the separation character and let you know.

Also, for that online code reader link I posted earlier, I needed to scale up the image in GIMP since it can't read the single-pixel PNG iec16022 generates. From what I recall on using other software, it should show {GS} if it is correct.

[Rex-On-GitHub]

Alright! I think you got it! I was able to duplicate the results from an image from a GS1 guidance doc.
From guidance:

Generated:

The actual datamatrixes look a little different though. I plan to have access to a verifier soon so I can test it out more rigorously.

Thanks again for your help rdoeffinger!