Dear IText Experts,
How can I appen an existing PDF with some kind of content (e.g Image) in a
way sush that the new content has incremented generation number and the
signature of the original contents (with the previous generation number)
stays valid?
What I would like:
Createing a PDF document with some kind of content.
Signing it with my "tool" and send the document to an other person.
iterate
{
The receiver person opens the PDF, modifies it (adding tables, images or
comments) and signes the PDF doc with the "tool".
The doc is forwarded to the next person.
}
At the end of the process the PDF contains all of the versions and
signetures belongs to the actual version created before.
What I used:
To extend the pdf:
PdfReader readerToModify = new PdfReader(this.inputPDF);
PdfStamper stamperToModify = new PdfStamper(readerToModify, new
FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0',true);
PdfContentByte under = stamperToModify.GetUnderContent(1);
Image img = Image.GetInstance(File.ReadAllBytes("hegy.jpg"));
img.SetAbsolutePosition(20f, 20f);
under.AddImage(img);
stamperToModify.Close();
For multiple signature:
PdfReader reader = new PdfReader(this.inputPDF);
PdfStamper st = PdfStamper.CreateSignature(reader, new
FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0', null,
true);
st.MoreInfo = this.metadata.getMetaData();
PdfSignatureAppearance sap = st.SignatureAppearance;
sap.SetCrypto(myCert.Akp, myCert.Chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
sap.SetVisibleSignature(new iTextSharp.text.Rectangle(300, 650, 450, 750),
1, null);
st.Close();
The problem is that, the generation number of the image stays '0', so the
first signature will be invalid.
Please see the attached pdf files! ( 17 0 obj <</...)
OneParagraph1 is the original signed file.
OneParagraph2 is extended with one image.
OneParagraph3 is extended with one image and one more signature.
The desired state is a PDF with 2 versions, the first has one paragraph and
a signature on the version, and second version extended with one image and
one more signature on it. (In the same file.)
What should I use?
Any help would be appreciated!
Bests,
Tamas
http://old.nabble.com/file/p26132337/OneParagraph2.pdf OneParagraph2.pdf
http://old.nabble.com/file/p26132337/OneParagraph.pdf OneParagraph.pdf
http://old.nabble.com/file/p26132337/OneParagraph1.pdf OneParagraph1.pdf
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Sent from the iText - General mailing list archive at Nabble.com.
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