Qr Code Encoding and Decoding Using Zxing

QR Code encoding and decoding using zxing

So, for future reference for anybody who doesn't want to spend two days searching the internet to figure this out, when you encode byte arrays into QR Codes, you have to use the ISO-8859-1character set, not UTF-8.

Decoding QR Code embedded into PDF with ZXing on Java backend

Your code works if one removes

hints.put(DecodeHintType.PURE_BARCODE, Boolean.FALSE);

I suspect that ZXIng only checks whether there is an entry for the key and not its value. The javadoc mentions "Doesn't matter what it maps to; use Boolean.TRUE."

Encoding and decoding byte[] with ZXing

You are making the mistake of thinking that you can turn arbitrary binary data into a valid string without using some kind of armouring. It doesn't work. Binary -> text -> binary is lossy using any of the standard character sets / encoding. (Hint: using UTF-8 won't work either.)

You should use something like base64 encoding or hexadecimal encoding to ensure that the binary data doesn't get mangled.

Show errors during decoding QRcode. Using ZXing Java library

It's a good idea to try reading the source first. In com.google.zxing.common.reedsolomon.ReedSolomonDecoder, there is a method findErrorLocations() which pretty clear does exactly this.

Encoding and decoding random byte array with zxing

Try PURE_BARCODE mode as a detection hint. Strangely, false positive detection of finder patterns is a much bigger problem when the image is just a pure synthetic image. The heuristics assume a photo, which doesn't have these problems. In this alternate mode it can take advantage of knowing it's a pure image and not a photo and be much faster and never get the detection wrong.

Storing binary data in QR codes

It turned out that ZXing is just crap, and ZBar does some weird stuff with the data (converting it to UTF-8 for example). I managed to get it to output the raw data including null bytes though. Here is a patch for the best Android ZBar library I found, that has now been merged.

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