Hi Leonard,
The code doesn't throw any error, it executes fine but there is no change in
digitally signed pdf. It is fine for me even it would show the signature
invalid after the modification.
My code works fine for normal pdf i.e pdf without digital signature.
I would really appreciate any help.
Regards,
Kiran
--- On Thu, 4/28/11, Leonard Rosenthol <[email protected]> wrote:
From: Leonard Rosenthol <[email protected]>
Subject: Re: [iText-questions] How to watermark a digitally signed pdf
programatically
To: "Post all your questions about iText here"
<[email protected]>
Date: Thursday, April 28, 2011, 10:00 AM
What do you mean “doesn’t work”?
An error is thrown? The code executes fine but nothing shows on the PDF?
Other?!?!?
Be aware, of course, that modifying a digitally signed PDF will cause the
signature to show as INVALID (for obvious reasons)
Leonard
From: Kiran Nepal [mailto:[email protected]]
Sent: Thursday, April 28, 2011 9:27 AM
To: [email protected]
Subject: [iText-questions] How to watermark a digitally signed pdf
programatically
Hi Friends,
I urgently need to add watermark on a digitally signed pdf programatically
using C#. I can watermark normal pdf using the code below but, it doesn't work
for a pdf that with digital signature. Can you please help me to solve this
issue.
The following code works and adds watermark on a normal pdf and doesn't work
for digitally signed pdf
public void AddWatermarkText(string sourceFile, string outputFile,
string watermarkText, iTextSharp.text.pdf.BaseFont watermarkFont, float
watermarkFontSize, iTextSharp.text.Color watermarkFontColor, float
watermarkFontOpacity, float watermarkRotation,string waterMarkWord)
{
iTextSharp.text.pdf.PdfReader reader = null;
iTextSharp.text.pdf.PdfStamper stamper = null;
iTextSharp.text.pdf.PdfGState gstate = null;
iTextSharp.text.pdf.PdfContentByte underContent = null;
iTextSharp.text.Rectangle rect = null;
int pageCount = 0;
try
{
{
reader = new iTextSharp.text.pdf.PdfReader(sourceFile);
rect = reader.GetPageSizeWithRotation(1);
//stamper = new iTextSharp.text.pdf.PdfStamper(reader, new
System.IO.FileStream(outputFile, System.IO.FileMode.Create));//original working
but not for signed certificate
stamper = new PdfStamper(reader, new
System.IO.FileStream(outputFile, System.IO.FileMode.CreateNew), '\0', true);
//Runs but doesn't work for signed pdf
//PdfStamper stamp = new PdfStamper(reader, new
BinaryReader("c:\\my_dir\\" + SignedPdf + "-watermarked.pdf"), '\0', true);
//Google for writing in Signed Pdf
if (watermarkFont == null)
{
watermarkFont =
iTextSharp.text.pdf.BaseFont.CreateFont(iTextSharp.text.pdf.BaseFont.HELVETICA,
iTextSharp.text.pdf.BaseFont.CP1252,
iTextSharp.text.pdf.BaseFont.NOT_EMBEDDED);
}
if (watermarkFontColor == null)
{
watermarkFontColor = iTextSharp.text.Color.BLUE;
}
gstate = new iTextSharp.text.pdf.PdfGState();
gstate.FillOpacity = watermarkFontOpacity;
gstate.StrokeOpacity = watermarkFontOpacity;
pageCount = reader.NumberOfPages;
for (int i = 1; i <= pageCount; i++)
{
//underContent = stamper.GetUnderContent(1); //If we
need just one page, comment for loop and pagecount and write (1) instead of i
underContent = stamper.GetUnderContent(i); //write uder
the other text///GetOverContent for above the existing page
//_with1 = underContent;
underContent.SaveState();
underContent.SetGState(gstate);
underContent.SetColorFill(watermarkFontColor);
underContent.BeginText();
underContent.SetFontAndSize(watermarkFont,
watermarkFontSize);
underContent.SetTextMatrix(30, 30);
underContent.ShowTextAligned(iTextSharp.text.Element.ALIGN_CENTER,
watermarkText, rect.Width / 2, rect.Height / 2, watermarkRotation);
underContent.EndText();
underContent.RestoreState();
}
}
stamper.Close();
reader.Close();
}
catch (Exception ex)
{
throw ex;
}
}
Thanks
Kiran
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The most intuitive, comprehensive, and cost-effective network
management toolset available today. Delivers lowest initial
acquisition cost and overall TCO of any competing solution.
http://p.sf.net/sfu/whatsupgold-sd
_______________________________________________
iText-questions mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/itext-questions
iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
