CODEWITHSUNDEEP
barcodezxing.net
Billdr
Billdr

Reputation: 1579

ZXing.NET UPC_A Extensions

I'm trying to decode barcodes on magazines and comic books. These guys sometimes have an "extension" of 2 or 5 digits stored in a slightly separated code; it is used to encode things like the issue number. It's described here.

I have this sample image: enter image description here

In my application, I've written this proof of concept method:

[HttpPost]
public string Post([FromForm] IFormFile file)
{
    string barcode = string.Empty;
    using (var stream = file.OpenReadStream())
    {

        try
        {
            stream.Seek(0, SeekOrigin.Begin);
            using var coreCompatImage = (Bitmap)Bitmap.FromStream(stream);
            var coreCompatReader = new ZXing.Windows.Compatibility.BarcodeReader();
            coreCompatReader.Options.PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.UPC_A };
            var coreCompatResult = coreCompatReader.Decode(coreCompatImage);
            var multipleCodes = coreCompatReader.DecodeMultiple(coreCompatImage);
            barcode = coreCompatResult?.Text ?? string.Empty;
        }    
        catch (Exception exc)
        {
            return "Error processing the image: ";
        }
    }
    return barcode;
}

I was hoping multipleCodes would pick up both barcodes, but I only get the first 12 digits.

How do I convince ZXing to return "75966066620843200131" instead of "759660666208432"?

Upvotes: 1

Views: 104

Answers (0)

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