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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