I generate a batch of qrcode image and decode by zxing, but some qrcode cannot be deco

Fixed in <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https

"ER225410741DB-0" qrcode is wrong about qrcoder HOT 4 CLOSED

codebude commented on August 24, 2024

"ER225410741DB-0" qrcode is wrong

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Comments (4)

codebude commented on August 24, 2024

Could you please try to set the forceUtf8 parameter in the createQRCode method to true and tell me if this solves your problems.

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chenghuaiyu commented on August 24, 2024

I've solved the problem. It's the bug in function CalculateECCWords(). the reason is the leading polyitem's coefficent is zero in some case, removing this item lead to the item count less than

eccWords, then continue doing XORs cause the final leadTermSource's last exponent is less than 0, so the wrong ECCWords are returned. The simple solution is appending an zero coefficient item in last position when removing the leading zero coefficient item. following is the code snippet.

        for (var i = 0; (leadTermSource.PolyItems.Count > 0 && leadTermSource.PolyItems[leadTermSource.PolyItems.Count-1].Exponent > 0); i++)
        {
            if (leadTermSource.PolyItems[0].Coefficient == 0)
            {   
                leadTermSource.PolyItems.RemoveAt(0);
                leadTermSource.PolyItems.Add(new PolynomItem(0, leadTermSource.PolyItems[leadTermSource.PolyItems.Count - 1].Exponent - 1));
            }
            else
            {
                var resPoly = this.MultiplyGeneratorPolynomByLeadtermCoefficient(generatorPolynom, this.GetAlphaExpFromIntVal(leadTermSource.PolyItems[0].Coefficient), i);
                resPoly = this.ConvertToDecNotation(resPoly);
                resPoly = this.XORPolynoms(leadTermSource, resPoly);
                leadTermSource = resPoly;
            }
        }

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codebude commented on August 24, 2024

Reopened, so that I don't forget to implement and merge it.

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codebude commented on August 24, 2024

Fixed in bafdd1f

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