Hi,
I need to read barcodes from a pdf document.
I read from your documentation that I must extract images from the pdf document and process them with the BarCodeReader object.

But, unfortunately, this way does'nt work for some barcodes.
Please check the attached document.

Why the barcode was not found?

My test code is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Aspose.Pdf.Kit;
using System.IO;
using Aspose.BarCodeRecognition;


namespace ConsoleApplication1 {
    class Program {

        const string    ASPOSE_LIC_PATH = "Aspose.Total.lic";

        static void Main(string[] args) {
            try {

                // set the license for Aspose.BarCode for .NET and Aspose.Pdf.Kit for .NET components
                Aspose.BarCodeRecognition.License licenceBarCodeRecognition = new Aspose.BarCodeRecognition.License();
                licenceBarCodeRecognition.SetLicense(ASPOSE_LIC_PATH);
                Aspose.Pdf.Kit.License licensePdfKit = new Aspose.Pdf.Kit.License();
                licensePdfKit.SetLicense(ASPOSE_LIC_PATH);

                // bind the pdf document
                PdfExtractor pdfExtractor = new PdfExtractor();
                pdfExtractor.BindPdf(@"FATTP00000000005.pdf");

                // set page range for image extraction
                pdfExtractor.StartPage = 1;
                pdfExtractor.EndPage = 1;

                // extract the images
                Console.WriteLine("Extracting images.....");
                pdfExtractor.ExtractImage();

                // save images to stream in a loop
                while (pdfExtractor.HasNextImage()) {
                    Console.WriteLine("Getting next image....");

                    // save image to stream
                    MemoryStream imageStream = new MemoryStream();
                    pdfExtractor.GetNextImage(imageStream);
                    imageStream.Position = 0;
                    Console.WriteLine("Recognizing barcode....");

                    // recognize the barcode from the image stream above
                    BarCodeReader barcodeReader = new BarCodeReader(imageStream, BarCodeReadType.Code128);
                    while (barcodeReader.Read()) {
                        Console.WriteLine("Codetext found: " + barcodeReader.GetCodeText() + ", Symbology: " + barcodeReader.GetReadType().ToString());
                    }

                    // close the reader
                    barcodeReader.Close();

                }

            } catch (Exception ex) {
                Console.WriteLine(ex.Message);
            }

            Console.WriteLine("Press Return to terminate");
            Console.ReadLine();
        }

    }

}

Hi, I've noticed that with an older version of the barcode libraries the barcode was readed!!

The old version I've tried is the 4.1.0.0 both for Aspose.BarCodeRecognition.dll and Aspose.BarCode.dll.

My current version is the 4.5.0.0 (for both libraries).

Is tihs a new bug introdiced with latest versions?
Can I use old libraries without any risk?

Hi Alessandro,

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Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

Hi,

Hi Jason, 

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Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

Hi,
I've found some others problems with pdf documents.
Please see the attached PDF document: I' cannot read the EAN13 barcode inside.

This is my code (using Aspose.BarCode 4.1.0.0 and Aspose.BarCodeRecognition 4.1.0.0):

static void  testReadFromPDF () {
    try {

        // set the license for Aspose.BarCode for .NET and Aspose.Pdf.Kit for .NET components
        Aspose.BarCodeRecognition.License licenceBarCodeRecognition = new Aspose.BarCodeRecognition.License();
        licenceBarCodeRecognition.SetLicense(ASPOSE_LIC_PATH);
        Aspose.Pdf.Kit.License licensePdfKit = new Aspose.Pdf.Kit.License();
        licensePdfKit.SetLicense(ASPOSE_LIC_PATH);

        // bind the pdf document
        PdfExtractor pdfExtractor = new PdfExtractor();
        pdfExtractor.BindPdf(@"document1.pdf");

        // set page range for image extraction
        pdfExtractor.StartPage = 1;
        pdfExtractor.EndPage = 1;

        // extract the images
        Console.WriteLine("Extracting images.....");
        pdfExtractor.ExtractImage();

        // save images to stream in a loop
        while (pdfExtractor.HasNextImage()) {
            Console.WriteLine("Getting next image....");

            // save image to stream
            MemoryStream imageStream = new MemoryStream();
            pdfExtractor.GetNextImage(imageStream);
            imageStream.Position = 0;
            Console.WriteLine("Recognizing barcode....");

            // recognize the barcode from the image stream above
            BarCodeReader barcodeReader = new BarCodeReader(imageStream, BarCodeReadType.EAN128);
            while (barcodeReader.Read()) {
                Console.WriteLine("Codetext found: " + barcodeReader.GetCodeText() + ", Symbology: " + barcodeReader.GetReadType().ToString());
            }

            // close the reader
            barcodeReader.Close();

        }

    } catch (Exception ex) {
        Console.WriteLine(ex.Message);
    }

    Console.WriteLine("Press Return to terminate");
    Console.ReadLine();
}

Any help?

Hi,

---

Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

Hi, thank you for your support.
I've tested the new DLLs (4.5.0.1) and they are ok whith my document1.pdf.
But now I'm testing your DLLs over various document to find other issues.
Now I've problems with the new attached document.

The code is the same as previous (only replace BarCodeReadType.EAN13 with BarCodeReadType.Code128), and the problem is that the found barcode is incorrect because it has an initial "f" character:

Codetext found: fD00000001863, Symbology: Code128

Any suggestions?

I'm a little worried about your libraries... because my application is based on your libraries for writing and reading barcodes and then it is very important for me that they work correctly!

Hi,

---

Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

I've generated the barcode with the Aspose.BarCode.BarCodeBuilder but then I've printed the document using PDFCreator.

Hi,

---

Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

Hi, I'm not able to give you my code to generate the file, as I said, the file was generated by printing the image on PDFCreator.

But I think that the problem is on the recognition library, because I can easily read the barcode on the file by other apps (for example a simple barcode reader on my iphone, reading through the monitor!).

I've created a new private post with an attached file, that is confidential.
The attached file has a barcode that I cannot read with aspose libraries (both with 4.1.0.0 and 4.5.0.1 versions). This file is generated by one of our customers, with its ERP.
Even in this case I can read the barcode with my iphone simple app!
The link to the post is:
http://www.aspose.com/community/forums/361992/another-file-with-barcode-that-cannot-be-read/showthread.aspx#361992

Thank you for your support.

Hi,

---

Babar Raza
Support Developer,
Aspose Sialkot Team
http://www.aspose.com/
Aspose - Your File Format Experts

The issues you have found earlier (filed as BARCODENET-33143) have been fixed in this update.

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