Barcode not getting recognized by reader.ReadBarCodes() for the attached file

Aspose.BarCode Product Family
1

I am facing issues while recognizing barcodes for the latest versions of Aspose.barcode and Aspose.pdf for web applications.

Aspose.Barcode : 22.5.0.0 or 22.6.0.0
Aspose.PDF: 22.6.0.0

Code Snippet:

using (Aspose.Pdf.Document pdfDoc = new Aspose.Pdf.Document(@“C:/MyProjects/BarCodeTest/TestFiles/UnRecognized_YBarcode.pdf”))
{
Aspose.BarCode.License license = new Aspose.BarCode.License();
license.SetLicense(“Aspose.Total.lic”);
Aspose.Pdf.License license1 = new Aspose.Pdf.License();
license1.SetLicense(“Aspose.Total.lic”);

            Dictionary<int, string> dictBarCode = new System.Collections.Generic.Dictionary<int, string>();
            Aspose.Pdf.Devices.PngDevice pngDevice = new Aspose.Pdf.Devices.PngDevice(new Aspose.Pdf.Devices.Resolution(300));

            //proceed all pdf pages, pages start from 1
            for (int i = 1; i <= pdfDoc.Pages.Count; ++i)
            {
                //render pdf page to the stream
                using (MemoryStream ms = new MemoryStream())
                {
                    pngDevice.Process(pdfDoc.Pages[i], ms);
                    ms.Position = 0;

                    //recognize barcode
                    BarCodeReader reader = new BarCodeReader(ms, DecodeType.Code128);

                    foreach (BarCodeResult result in reader.ReadBarCodes())
                    {
                        try
                        {
                            string code = result.CodeTypeName;
                            string codeText = result.CodeText;
                            dictBarCode.Add(i, codeText);
                        }
                        catch { }

                    }
                }
            }

Please check attached files of recognized and unrecognized barcode files. Unable to understand the issue with UnRecognized_YBarcode.pdf file and want to fix it earlier.

Please find attachments and let me know how can we fix this issue.
Recognized_CBarcode.pdf (731.1 KB)
UnRecognized_YBarcode.pdf (41.7 KB)

Thanks!

2

Just have checked:

Aspose.Pdf.Document pdfDoc = new Aspose.Pdf.Document(@"d:\save\rec\UnRecognized_YBarcode.pdf");
Dictionary<int, string> dictBarCode = new System.Collections.Generic.Dictionary<int, string>();
Aspose.Pdf.Devices.PngDevice pngDevice = new Aspose.Pdf.Devices.PngDevice(new Aspose.Pdf.Devices.Resolution(300));

//proceed all pdf pages, pages start from 1
for (int i = 1; i <= pdfDoc.Pages.Count; ++i)
{
    //render pdf page to the stream
    using (MemoryStream ms = new MemoryStream())
    {
        pngDevice.Process(pdfDoc.Pages[i], ms);
        ms.Position = 0;

        //recognize barcode
        BarCodeReader reader = new BarCodeReader(ms, DecodeType.Code128);

        foreach (BarCodeResult result in reader.ReadBarCodes())
        {
            try
            {
                string code = result.CodeTypeName;
                string codeText = result.CodeText;
                dictBarCode.Add(i, codeText);
            }
            catch { }

        }
    }
}

.Net Framework 4.8
Result:
“YSI~1~psres3~t0009782 ~Documents~Barcode 128 Test20220526.pdf”

I think the problem could be in place where license is set. You should at first set the license, then manipulate with files or images.

3

You can use singleton for lazy license initialization