main project page:
http://thomasdiewald.at/processing/libraries/diewald_barcode/

github repository:
https://github.com/diwi/diewald_barcode

processing forum
http://forum.processing.org/topic/barcode-library-diewald-barcode

online applet (made from the old library-version):

http://www.openprocessing.org/visuals/?visualID=12942

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this library is made decoding/encoding barcodes.
its basically a wrapper for google’s zxing library

– ENCODING of barcodes:

  1. CODE_128
  2. CODE_39
  3. EAN_13
  4. EAN_8
  5. ITF
  6. QR_CODE

– DECODING of barcodes:

  1. AZTEC
  2. CODABAR
  3. CODE_128
  4. CODE_39
  5. CODE_93
  6. DATA_MATRIX
  7. EAN_13
  8. EAN_8
  9. ITF
  10. PDF_417
  11. QR_CODE
  12. UPC_A
  13. UPC_E

– decoding multiple barcodes at once
– decoding multiple QRcodesbarcodes at once
– exception feedback on decoing/encoding failures
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 online BarcodeGenerator (sourcecode+application)