Hello,
I am trying to add & retrieve a bmp image in the last page of a pdf file using
iText. My code, so far, is the following:
private void cmd_addImageToPDF() throws Exception {
PdfReader reader = new PdfReader(pdfFileName.getName());
PdfStamper stamp = new PdfStamper(reader, new FileOutputStream("output.pdf"));
PdfWriter writer = stamp.getWriter();
PdfContentByte content = stamp.getOverContent(reader.getNumberOfPages());
com.lowagie.text.Image img =
com.lowagie.text.Image.getInstance(BMPFileLocation);
//img.setDirectReference(new PRIndirectReference(reader, 10));
img.setAbsolutePosition(450,10);
content.addImage(img);
stamp.close();
reader.close();
}
The image is added perfectly in the last page of the pdf.
The problem comes when I try to retrieve and re-create the BMP image. The code
goes like that:
private void retrieveImageFromPDF() {
try {
PdfReader reader = new PdfReader(pdfFileName.getName());
for (int i = 0; i < reader.getXrefSize(); i++) {
PdfObject pdfobj = reader.getPdfObject(i);
if (pdfobj != null) {
if (pdfobj.isStream()) {
PdfStream pdfdict = (PdfStream) pdfobj;
PdfObject pdfsubtype = pdfdict.get(PdfName.SUBTYPE);
if (pdfsubtype == null) {
continue;
}
if (!pdfsubtype.toString().equals(
PdfName.IMAGE.toString())) {
continue;
}
System.out.println("height:"
+ pdfdict.get(PdfName.HEIGHT));
System.out.println("width:"
+ pdfdict.get(PdfName.WIDTH));
System.out.println("bitspercomponent:"
+ pdfdict.get(PdfName.BITSPERCOMPONENT));
System.out.println(pdfdict.getRawLength()+" ");
byte[] barr = PdfReader.getStreamBytesRaw((PRStream) pdfdict);
stegoImage = Toolkit.getDefaultToolkit().createImage(barr);
System.out.println(pdfdict.toString()+" ");
System.out.println(barr.length);
for ( int a = 0; a < barr.length; a++ )
System.out.print(barr[a]+" ");
return;
}
}
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
So when stegoImage (awt.Image) is re-created by the pdf file, I try to write it
to a file, using a specific class re-creating the BMP file using the raw data
(awt.Image --> File bmp).
But all I am left with is a black bmp image.
Is this the correct way to go, or am I missing something? Should I retrieve the
image's bytes using something like pdfbox?
My main requirement is to retrieve the image bytes, exactly as they are,
because I am "embedding" hidden information in them, which will be retrieved
using other functions operating on the bmp file.
Thanks in advance and sorry for my inexpertise but I have just started
experimenting with iText,
Antony-------------------------------------------------------------------------
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