CODEWITHSUNDEEP
javaitextbarcodeqr-codezxing
reizintolo
reizintolo

Reputation: 439

How to read a Data Matrix barcode

I have to read a Data Matrix code inside of a PDF file, I was investigating the posibilities, and I had some questions about that:

1.- I work with Itext, I was looking for information about the posibility to read this QR barcode with this library, but I have not results about that, is possible??

2.- I discovered another library ZXING : https://github.com/zxing/zxing, but I could not find the way to read inside the PDF.

Can somebody help me with this problem?

New Information, with new Ideas, for fix the problem:

This is my code, with PDFBOX I find the image for each page, afterwards I check if is this image is a barcode for get the data, I don't know why but I can't detect a barcode with this code, the quality of the barcode is high in the PDF.

I try to use the Reader implementation but I couldn't find it, I have the version 3.1 ZXING, perhaps is in another version?

If I use directly the image from the file like this, works perfect:

Image image = ImageIO.read(new File("C:\Workarea\testBarcode.png")); BufferedImage buffered = (BufferedImage) image;

PDDocument document; try {
    document3 = PDDocument.load("TEST_QR_BARCODE.pdf");
    List pages = document.getDocumentCatalog().getAllPages();

    Iterator iter = pages.iterator();
    while( iter.hasNext() )
    {
        PDPage page = (PDPage)iter.next();
        PDResources resources = page.getResources();
        Map images;

            images = resources.getImages();

        if( images != null )
        {
            Iterator imageIter = images.keySet().iterator();
            while( imageIter.hasNext() )
            {
                String key = (String)imageIter.next();
                PDXObjectImage image = (PDXObjectImage)images.get( key );
                BufferedImage testcojones = image.getRGBImage();

                try {
                    LuminanceSource source;

                    source = new BufferedImageLuminanceSource(testcojones);

                    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

                    Result result = new MultiFormatReader().decode(bitmap);

                    ParsedResult parsedResult = ResultParser.parseResult(result);

                    System.out.println(" (format: " + result.getBarcodeFormat() + ", type: " +
                    parsedResult.getType() + "):\nRaw result:\n" + result.getText() + "\nParsed result:\n" +
                    parsedResult.getDisplayResult());
                    System.out.println("Found " + result.getResultPoints().length + " result points.");

                    for (int i = 0; i < result.getResultPoints().length; i++) {
                        ResultPoint rp = result.getResultPoints()[i];
                        if (rp != null) {
                            System.out.println(" Point " + i + ": (" + rp.getX() + ',' + rp.getY() + ')');
                        }
                    }

                    } catch (NotFoundException ignored) {
                        System.out.println("No barcode found!");
                    }

            }
        }
    } } catch (IOException e2) {
    // TODO Auto-generated catch block
    e2.printStackTrace(); }

Upvotes: 1

Views: 3809

Answers (1)

Sean Owen
Sean Owen

Reputation: 66881

To use zxing, you just need to create a BufferedImage in your Java program from the PDF. That's a separate question, but should be possible with another library. Then you can use BufferedImageLuminanceSource in mostly the way you see done here: https://github.com/zxing/zxing/blob/master/javase/src/main/java/com/google/zxing/client/j2se/DecodeWorker.java#L125

Upvotes: 0

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