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c#asp.netpdfitextbarcode

Generate PDF with iTextSharp


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();


    }


}

}


Solution

  • 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.