You have a broken PDF. I'm quite sure that your PDF doesn't have the
AcroForm dictionary. Acrobat manages to reconstruct it from the page
field annotations but iText can't do it.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Robert Esterer
> Sent: Tuesday, November 07, 2006 3:12 PM
> To: [email protected]
> Subject: [iText-questions] NeedAppearances & Fields
>
> Hello,
> It's me again with more problems regarding NeedAppearances.
> Yesterday I thought removing it would solve my problem (thanks to Mark
> Storer for the code and the warning about it being
> document-level) and it
> indeed makes the new signature visible but it also makes all the empty
> fields invisble in the "Signatures" tab (Acrobat).
> I've spent some time looking at what the Acrobat does and
> what iText does
> and just wanted to check if I understood it right.
>
> I have a PDF with 2+ empty signature fields. The PDF was
> created by adding
> eps files with pdfmarks code in an office document and
> converting them with
> distiller/ghostscript. The resulting PDF contains empty
> signature fields.
>
> BUT the PDF also contains the NeedAppearances flag. This
> causes the Acrobat
> to ask me if I want to save the document whenever I close it
> (even if I do
> nothing). Doing so causes the Acrobat to rebuild all
> signature fields. The
> resulting PDF looks identical to the old one but a) doesn't
> contain the
> NeedApperances Flag and b) now contains "real" objects (whatever that
> means).
> The saved document works fine with iText.
>
> BUT the unsaved (= newly created) PDF doesn't work with itext.
> One problem is that I can't seem to find any form fields
> (.getFields() and
> .getBlankSignatureNames() are epmty).
> Once I add an empty object using:
> PdfFormField field = PdfFormField.createEmpty(stp.getWriter());
> stp.addAnnotation(field, 1);
> stp.close();
> I can find all fields just fine.
> The other problem is that once I fill one field I have two
> possible outcomes
> (both of which are bad):
> a) I remove the NeedAppearance flag -> the new signature is
> visible, all
> other dissapear
> B) I leave the NeedAppearance and have an "invisible" signature.
>
> So, in order to make it work with iText I have to iterate
> through all fields
> and rebuild them into "real" objects before I save sign the
> PDF for the
> first time!?
> For now I can probably do this by reading the old signature fields
> properties, deleting it and creating a new one with the old
> ones properties
> (haven't tried it yet).
> But this won't cover other types of fiels. So the million
> dollar question
> is:
> Is there a way to tell iText to rebuild the appearance for
> all objects like
> the Acrobat does when you save it?
>
> Sorry for all the long text but this problem really got me
> worked up :(
>
> Any tips would be appreciated,
> -Robert
>
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