This is my first post to the list, so apologies if this has been covered before
(I've searched the archives but couldn't find anything).
I have a PDF which has been created using Adobe Acrobat Pro (not sure which
version). This PDF contains a single XFA form with various form fields, some of
which are inline with static text.
When the PDF is opened in Acrobat Reader, and the form fields are filled in by
hand, the values appear correctly aligned with the surrounding text. It all
works as expected.
However, when I fill the fields using
PdfStamper.getAcroFields().mergeXfaData(Document) the values appear to be
dropped slightly, so they appear approximately 1.5mm low on the page. Also the
whole page alignment seems to be altered slightly, with the top and bottom
margins becoming wider.
I've tried this both using and not using encryption, compression, and form
flattening, and the results are the same.
Also, when I check the various "boxes" of the reader object before and after
the
merge, the rectangle values all seem to be the same. So I don't think the box
sizes are being manipulated by the merging process.
Initially I was using version 2.1.4 of iText, but I have now also tried it with
versions 2.1.7 and 5.0.2, but I still see the same mis-alignment.
This mis-alignment is visible in the on-screen version of the PDF as well as
the
printed version, so I don't think it's a printer driver issue (unless printer
config can affect the on-screen layout too?)
I've included a code fragment at the end of this which I think shows the
relevant parts of what I'm trying to do, but I can provide full code if
necessary. I can also provide sample PDFs showing the problem (didn't want to
attach PDFs to this initial post), both the initial template PDF and the
version
after doing the XFA merge.
I've searched the iText documentation but couldn't find anything which seemed
relevant to this problem.
Any help with realigning the form fields is gratefully received. If the problem
is that I'm missing something in the API please feel free to just tell me where
to look.
Thanks for any help,
Adam Carless
PS: Here's a code fragment to show what I'm doing. The real code has more
comments and error handling, but this is the main XFA handling part:
static byte[] merge(byte[] template, String xfaData) throws PdfMergeException {
try {
PdfReader reader = new PdfReader(template);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
// Set name-space awareness as xfa is defined within its own
// (remove this and you will get NPE's from the mergeXfaData call
// when it's parsing the incoming DOM).
dbf.setNamespaceAware(true);
// xfaData is a constructed XML fragment with a root element of
// "<topmostSubform>" holding a set of "<name>value</name>" elements
InputSource is = new InputSource(new StringReader(xfaData));
is.setEncoding("UTF-8");
Document doc = dbf.newDocumentBuilder().parse(is);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfStamper stamper = new PdfStamper(reader, baos);
stamper.getAcroFields().mergeXfaData(doc);
stamper.close();
return baos.toByteArray();
}
catch (Exception e) {
throw new PdfMergeException("PDF merging problem", e);
}
}
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