How to implement or add a digital signature in a pdf file using Asp.net

Published: 07 July 2021
on channel: ReviewOhHope

5,999

Dim _reader As iTextSharp.text.pdf.PdfReader

Dim outputPdfStream = New MemoryStream

_reader = New iTextSharp.text.pdf.PdfReader(Server.MapPath("upload/" & r!t_file))
Dim stamper = New iTextSharp.text.pdf.PdfStamper(_reader, outputPdfStream)

Dim picpath As String = Server.MapPath("signature/signature01.png")

Dim image1 As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(picpath)
image1.ScalePercent(52.0F)
image1.SetAbsolutePosition(
(iTextSharp.text.PageSize.A4.Width - image1.Width), 80)

Try
Dim waterMark As iTextSharp.text.pdf.PdfContentByte
waterMark = stamper.GetOverContent(1)
waterMark.AddImage(image1)

Catch ex As Exception
'fs.Close()
Dim pp As String = ex.ToString
End Try

stamper.FormFlattening = True
stamper.Close()
_reader.Close()

Response.ContentType = "application/pdf"

Response.AddHeader("content-length", outputPdfStream.ToArray.Length.ToString())
Response.AddHeader("Content-Disposition", "attachment; filename=file.pdf")
Response.BinaryWrite(outputPdfStream.ToArray())
Response.Flush()
Response.End()

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