Here's some code to get you started:
PdfReader pdf = new PdfReader("in.pdf");
PdfStamper stp = new PdfStamper(pdf, new FileOutputStream("out.pdf"));
PdfWriter writer = stp.getWriter();
Image img = Image.getInstance("image.png");
PdfContentParser cp = new PdfContentParser(new
PRTokeniser(pdf.getPageContent(1)));
PdfName first = null;
while (true) {
ArrayList ar = cp.parse(null);
if (ar.size() == 0)
break;
if ("Do".equals(ar.get(ar.size() - 1).toString())) {
first = (PdfName)ar.get(0);
break;
}
}
if (first != null) {
PdfDictionary pg = pdf.getPageN(1);
PdfDictionary res =
(PdfDictionary)PdfReader.getPdfObject(pg.get(PdfName.RESOURCES));
PdfDictionary xobj =
(PdfDictionary)PdfReader.getPdfObject(res.get(PdfName.XOBJECT));
if (xobj != null) {
PdfObject obj = xobj.get(first);
if (obj.isIndirect()) {
PdfDictionary tg =
(PdfDictionary)PdfReader.getPdfObject(obj);
PdfName type =
(PdfName)PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE));
if (PdfName.IMAGE.equals(type)) {
PdfReader.killIndirect(obj);
Image maskImage = img.getImageMask();
if (maskImage != null)
writer.addDirectImageSimple(maskImage);
writer.addDirectImageSimple(img,
(PRIndirectReference)obj);
}
}
}
}
stp.close();
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of java.jago
> Sent: Sunday, June 04, 2006 3:42 AM
> To: [email protected]
> Subject: Re: [iText-questions] Generate PDF, send it to the
> server and add a Background Image on each page...isthis
> possible with iText ???
>
> Paulo Soares wrote:
>
> > Have a look at
> >
> http://article.gmane.org/gmane.comp.java.lib.itext.general/226
> 48. To know
> > what's the image to replace use PdfContentParser to get the
> first "Do"
> > command. The operand will be a name that will point to the
> image in the
> > resource dictionary. You don't need to change the content,
> just the image.
> >
> > Paulo
>
> thanks for the answer,
>
> In http://article.gmane.org/gmane.comp.java.lib.itext.general/22648
> there is a new pdf created - can I also do in-place editing of the
> original-pdf ?
>
> I don't get this completely: to get the first "Do" command.
> The operand
> will be a name that will point to the image in the resource
> dictionary.
>
> Can you explain it in detail ?
>
> Cheers,
> jago
>
>
>
> >
> > ----- Original Message -----
> > From: "Andreas Schmidt" <[EMAIL PROTECTED]>
> > To: <[email protected]>
> > Sent: Saturday, June 03, 2006 12:55 AM
> > Subject: [iText-questions] Generate PDF,send it to the
> server and add a
> > Background Image on each page...isthis possible with iText ???
> >
> >
> >
> >>Hi,
> >>
> >>>From what I read it is impossible to add more content to a
> PDF with iText
> >>once it is "created"/"closed" ?
> >>
> >>What I want to do:
> >>
> >>The user can create pdfs and sends them to a server. (i have done
> >>everything
> >>to that point).
> >>
> >>On every page of the pdf there is a background-image (in
> the layer given
> >>by
> >>getDirectContentUnder()). This background image has a low
> resolution and
> >>is
> >>supposed to be replaced by a high-resolution version of
> that image, which
> >>only resides on the server.
> >>
> >>>From what I read in the iText Api/Tutorial such a
> replcement/edit is not
> >>possible with iText - but perhaps I am missing out
> something hopefully ? I
> >>would really like to do it this way - is there perhaps
> another library
> >>that
> >>can do such an edit ?
> >>
> >>Cheers,
> >>jago
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