使用Zxing扫描Java中的二维条形码

Question

I'm trying to scan 2D barcodes in Java with the following code:

InputStream in = null;
        BufferedImage bfi = null;
        File[] files = new File("codes").listFiles();

        for (int i = 0; i < files.length; i++) {
            try {
                in = new FileInputStream(files[i]);
                bfi = ImageIO.read(in);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            if (bfi != null) {
                LuminanceSource source = new BufferedImageLuminanceSource(
                        bfi);
                BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(
                        source));
                Reader reader = new MultiFormatReader();
                Result result = null;

                Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
                decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);

                try {
                    result = reader.decode(bitmap, decodeHints);
                } catch (NotFoundException e) {
                    e.printStackTrace();
                } catch (ChecksumException e) {
                    e.printStackTrace();
                } catch (FormatException e) {
                    e.printStackTrace();
                }
                System.out.println("Text: " + result.getText());
            } else {
                System.out.println("No Buffered Image for"
                        + files[i].getName());
            }

        }

The types of images I'm trying to scan resemble this one: http://www.apparategemeinschaft.de/07_s01.jpg

I would need to scan pdf417 predominantly.

It works when I simply scan a picture of a 2d-barcode. Is zxing even meant to be used for what Im trying to do?

I should make clear: for all .tif-images I scan, I get the message "no buffered image for ..."

UPDATE:

I added the following jars to the classpath: jai_imageio_linux-amd64.jar

And didnt change any code, as suggested by Robby.

It still doesnt work.

SECOND UPDATE:

I've got it now. The ImageIO.getReaderFileSuffixes() now includes .tiff as well.

New question: Do I have to tell zxing that there are more than one barcodes on the image?

Answer 1

You cannot, by default, read a TIFF file into a buffered image using ImageIO . Calling ImageIO.getReaderFileSuffixes() will return an array of the supported file formats which should at least include JPEG, PNG, BMP, WBMP and GIF.

You could use the Java Advanced Imaging (JAI) API which supports the TIFF format. Just adding the JAI jars to your classpath should be sufficient to make your code work.

You can find JAI downloads for your OS here .

Answer 2

I don't think this question has anything to do with barcodes or zxing. Your problem is that ImageIO.read returns null , right? It's not clear from your question.

Read the javadoc: http://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#read(java.io.File)

The image is not readable to Java.