Hello,
when creating a PDF document you can add a blank signature field explicitely
simply doing this:
writer.getAcroForm().addSignature("foobarsig", 73, 705, 149, 759);
When post-processing an existing PDF document using a PdfStamper, is there a
comparably easy way? Simply trying
stamper.getWriter().getAcroForm().addSignature("foobarsig", 73, 705,
149, 759);
results in a RuntimeException: Unsupported in this context. Use
PdfStamper.addAnnotation()
at com.lowagie.text.pdf.PdfStamperImp.addAnnotation(Unknown Source)
at com.lowagie.text.pdf.PdfAcroForm.addFormField(Unknown Source)
at com.lowagie.text.pdf.PdfAcroForm.addSignature(Unknown Source).
This actually makes sense as there is no current page in the PdfStamper while
the the one parameter method PdfWriter.addAnnotation() is expected to add the
annotation on the current page.
Borrowing from the existing iText routines but evading the PdfStamperImp
override of that method, I came up with
addSignature(stamper, signaturePage, "foobarsig", 73, 705, 149, 759);
using
PdfFormField addSignature(PdfStamper pdfStamper, int page, String name,
float llx, float lly, float urx, float ury)
{
PdfWriter pdfStamperImp = pdfStamper.getWriter();
PdfAcroForm acroForm = pdfStamperImp.getAcroForm();
PdfFormField signature = PdfFormField.createSignature(pdfStamperImp);
acroForm.setSignatureParams(signature, name, llx, lly, urx, ury);
acroForm.drawSignatureAppearences(signature, llx, lly, urx, ury);
pdfStamper.addAnnotation(signature, page);
return signature;
}
This works fine but looks too fragile considering possible future changes in
the iText routines called or replaced here.
Is there an explicite easy way for adding blank signature fields using the
PdfStamper I simply missed? Or could it be considered to add such a
functionality to iText in the near future?
Best regards, Michael.
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