Let me state this problem another way. I think I figured out how to
get the raw bytes of the barcode image, but decoding it is a problem.
I create this barcode from iText like so:
// create datamatrix bar code
BarcodeDatamatrix codeDm = getDatamatrix(code);
doc.add(codeDm.createImage());
private BarcodeDatamatrix getDatamatrix(String text) throws
UnsupportedEncodingException {
BarcodeDatamatrix dm = new BarcodeDatamatrix();
dm.setOptions(BarcodeDatamatrix.DM_AUTO);
dm.setHeight(40);
dm.setWidth(40);
dm.generate(text);
return dm;
}
Now, I would like to turn around and read it. So I have the following:
final PdfReader reader = new PdfReader(pdfBytes);
int xo = reader.getXrefSize();
for(int i=0; i<xo; i++) {
PdfObject obj = reader.getPdfObject(i);
if(obj!=null && obj.isStream()) {
PdfDictionary pd = (PdfDictionary)obj;
if(pd.contains(PdfName.SUBTYPE) &&
pd.get(PdfName.SUBTYPE).toString().equals("/Image")) {
String filter = pd.get(PdfName.FILTER).toString();
if("/CCITTFaxDecode".equals(filter)) {
byte[] rawBytes =
PdfReader.getStreamBytesRaw((PRStream)obj);
final ByteArraySeekableStream stream = new
ByteArraySeekableStream(rawBytes);
List<RenderedImage> list = getImages(stream);
} else {
throw new RuntimeException("filter was
"+filter);
}
}
}
}
It turns out that the filter is "/CCITTFaxDecode" when you create the
BarcodeDatamatrix.
I already have code that can decode TIFF -- the method above where it does this:
List<RenderedImage> list = getImages(stream);
This method has been working fine for FAXes and is in production for a
year now. When I pass the stream with the raw bytes here, it tells me
that it is not a valid TIFF -- the TIFF bytes in the header are not
correct to be exact.
This is where I'm stuck. Has anyone here had success with creating a
BarcodeDatamatrix and then later extracting it from the PDF? If so,
any idea what I'm doing wrong here?
Thanks in advance,
Davis
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