[Barcode4j-users] [ barcode4j-Bugs-3495613 ] Generate wrong DataMatrix barcode

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Bugs item #3495613, was opened at 2012-02-29 02:08
Message generated for change (Comment added) made by jmaerki
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Andy (andysiu)
Assigned to: Nobody/Anonymous (nobody)
Summary: Generate wrong DataMatrix barcode

Initial Comment:
It is suspected that there is problem during encoding of DataMatrix barcode. The generated image is unable to be decoded by barcode scanner.

Below please find an example.
<ABCDEFG><ABCDEFGK>

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>Comment By: Jeremias Märki (jmaerki)
Date: 2012-02-29 23:34

Message:
I've looked at your examples. My MetroLogic Focus MS1690 hardware scanner
can decode the first one just fine. That one is purely about EDIFACT
encoding. I've also verified various deviations from the first example.
They were all good and also looked good from the way the codewords are
produced.

While my scanner does decode the big one, the result is wrong. But the
problems appear to be starting at a place where EDIFACT is not involved.

I have to dig deeper here, but right now I don't have the time for it.
Maybe I can take another look during the weekend. No promises.

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Comment By: Andy (andysiu)
Date: 2012-02-29 18:37

Message:
Thank you very much.

I tried another longer string.
http://online-barcode-reader.inliteresearch.com also decoded wrongly.

<PATIENT><HospitalCode>SHP</HospitalCode><HospitalName>Evangel
Hospital</HospitalName><MRN>HN124344(A)</MRN><EpisodicNo>223456</EpisodicNo><Surname>Chan</Surname><Givenname>Siu
Ling</Givenname><AdmissionDate>01-Dec-2010
00:00:00</AdmissionDate><DischargeDate>23-Feb-2012
00:00:00</DischargeDate></PATIENT>

http://imageshack.us/photo/my-images/707/barcode4j2.png/

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Comment By: Christopher Ulbright (culbright)
Date: 2012-02-29 18:22

Message:
In my case it was EDIFACT encoding. See
org.krysalis.barcode4j.datamatrix.DataMatrixHighLevelEncoder.java. I
actually turned off EDIFACT encoding myself when I was having a problem and
forced it to remain as standard ASCII. This requires modifying the source.
If you want more guidance let me know, but not tonight. ;)

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Comment By: Andy (andysiu)
Date: 2012-02-29 18:08

Message:
What encoding can be set?

I am using a real barcode scanner for testing. And it can decode the
DataMatrix barcode if the barcode is generated by another tools (same input
string).

And it is weird that it works fine if I change the input string to
"<ABCDEFG><ABCDF>"

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Comment By: Christopher Ulbright (culbright)
Date: 2012-02-29 17:52

Message:
I can read the barcode just fine using the BarcodeScanner app on my android
phone. What happens when you have those '>' characters is a different
encoding is used. Perhaps your reader has a problem with the encoding? I
had, what I think may be, this same issue and it turned out that my reader
was at fault.

You can run a test here: http://online-barcode-reader.inliteresearch.com/

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Comment By: Andy (andysiu)
Date: 2012-02-29 17:41

Message:
http://imageshack.us/photo/my-images/195/barcode4j.png/

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Comment By: Andy (andysiu)
Date: 2012-02-29 17:36

Message:
The problem occurs when the input string contains some specific pattern.
E.g. uppercase, '>' at some particular place.

The problem can be reproduced by the demo applet.

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Comment By: Christopher Ulbright (culbright)
Date: 2012-02-29 17:10

Message:
Do you have a sample image containing the incorrect barcode?

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