Zitat von Kacer-EXTERNAL Jaroslav <[email protected]>:
Dear colleagues,
Hi,
I'm trying to create a visual signature in a PDF document using PDF
Box like this:
PDDocument.addSignature(signature, signItfc, signatureOptions);
Unfortunately I'm not sure what the content of
signatureOptions.visualSignature should be. I went through this
mailing list, the PDF Box Examples project, StackOverflow and I
googled a lot but unfortunately I was not able to find any piece of
example code or documentation on this. The only mention is in a post
in from 2011-11-03, saying one should be able to use iText to
generate it.
The visualSignature object / inputStream need to contain (I guess) an
AppearanceDictionary with a visual representation. The problem is,
that the needed helper for creating a table with text, image or both
contents were missing in the pdfbox. So I used a fallback to iText and
created the visual representation there and give pdfbox the file as
inputstream.
So this undocumented feature was a hook and not a real solution for
creating visual signatures. I've read that someone implemented helper
for adding tables or some other elements to a page. Maybe this can be
used for creating a visual representation, but I haven't evaluate this
yet.
I also tried to generate the content using
createPDocumentSignature() from the 2011-11-03 post but no luck, I'm
getting ClassCastException (although the structure built up in
createPDocumentSignature looks like what PDF Box wants, at the first
sight).
There should be a jar with runnable examples on the svn. Maybe you
could look there for a signature creation example.
Is there anyone who has succeeded generating the right content of
the input stream? Not necessarily using iText, in fact we are trying
to replace iText with PDF Box.
Good question, maybe someone can provide such implementation. So we
can update and build a user friendly interface for this purpose.
...
Are there any plans to update the SignatureOptions class to accept a
structured Java object instead of an InputStream? That would make
things a lot easier.
As far as there is a suitable solution. Maybe a first step would be to
use something like PDAppearanceDictionary. But I haven't spend this
year much time with the implementation, so I forgot how I solved the
visualisation of the signature.
Thank you very much!
Jarda
Best regards
Thomas
