I am trying to add an image to the top of every page on an existing PDF. I have tried using PdfStamp but for some reason when I try to print the pdf from Chrome all I get is a black page. Also Adobe Reader only shows the original document. Does anyone have any ideas on how to get it working? Here is the code.
public partial class MakePdf : System.Web.UI.Page
{
public MemoryStream m = new MemoryStream();
protected void Page_Load(object sender, EventArgs e)
{
Document document = new Document(PageSize.LETTER);
Response.ContentType = "application/pdf";
string RESULT = @"C:\Users\maitchison\Documents\Pdf\Service Report Search - 650-10-067 4114.pdf";
PdfReader reader = new PdfReader(RESULT);
PdfStamper stamp = new PdfStamper(reader, m);
try
{
// Set ContentType and create an instance of the Writer.
Response.ContentType = "application/pdf";
PdfWriter writer = PdfWriter.GetInstance(document, m);
writer.CloseStream = false;
// Open Document
document.Open();
int n = reader.NumberOfPages;
int i = 1;
PdfContentByte cb = writer.DirectContent;
PdfContentByte over;
Barcode128 barcode128 = new Barcode128();
string text2 = "650-M5-013";
barcode128.Code = text2;
barcode128.ChecksumText = true;
float x = document.Right;
float y = document.Top;
iTextSharp.text.Image img2 = barcode128.CreateImageWithBarcode(cb, null, null);
img2.SetAbsolutePosition((x - img2.ScaledWidth), (y - img2.ScaledHeight));
while (i <= n)
{
over = stamp.GetOverContent(i);
over.AddImage(img2);
i++;
}
}
catch (DocumentException ex)
{
Console.Error.WriteLine(ex.StackTrace);
Console.Error.WriteLine(ex.Message);
}
// Close document
stamp.Close();
//document.Close();
// Write pdf bytes to outputstream.
Response.OutputStream.Write(m.GetBuffer(), 0, m.GetBuffer().Length);
Response.OutputStream.Flush();
Response.OutputStream.Close();
m.Close();
}
}
}
does the code sample you provided even output a PDF? it looks like you tried a number of different ways to add the barcode image and ended up with excess code that confused things...it confused me ;-)
anyway here's one way to achieve your goal with PdfStamper like you tried; example HTTP Handler (.ashx):
<%@ WebHandler Language='C#' Class='addBarcodeWithStamper' %>
using System;
using System.IO;
using System.Web;
using iTextSharp.text;
using iTextSharp.text.pdf;
public class addBarcodeWithStamper : IHttpHandler {
public void ProcessRequest (HttpContext context) {
HttpResponse Response = context.Response;
Response.ContentType = "application/pdf";
PdfReader reader = new PdfReader(context.Server.MapPath(PATH_TO_PDF));
/*
* save __one__ instance of barcode image;
* see MakeBarcode() method below
*/
iTextSharp.text.Image barcode = null;
float barcodeWidth = 0;
float barcodeHeight = 0;
using (PdfStamper stamper = new PdfStamper(reader, Response.OutputStream))
{
int n = reader.NumberOfPages;
for (int i = 1; i <= n; i++) {
PdfContentByte cb = stamper.GetOverContent(i);
/*
* re-use image bytes so they are added only __once__
*/
if (barcode == null) {
barcode = MakeBarcode(cb);
barcodeWidth= barcode.Width;
barcodeHeight= barcode.Height;
}
/*
* calculate in case individual page sizes are different
*/
Rectangle rect = stamper.Reader.GetPageSize(i);
float x = (rect.Width - barcodeWidth) / 2;
// modify/remove 10 offset as you see fit
float y = rect.Top - barcodeHeight - 10;
barcode.SetAbsolutePosition(x, y);
cb.AddImage(barcode);
}
}
}
public bool IsReusable {
get { return false; }
}
// ----------------------------------------------------------------------------
public iTextSharp.text.Image MakeBarcode(PdfContentByte cb) {
Barcode128 barcode128 = new Barcode128();
string text2 = "650-M5-013";
barcode128.Code = text2;
barcode128.ChecksumText = true;
return barcode128.CreateImageWithBarcode(cb, null, null);
}
}
obviously you need to change PATH_TO_PDF above to the actual path of the PDF. there are also other ways to achieve the same goal. for example using PdfPageEventHelper.