How to pass and use variables to iTextSharp .dll used in script task

Hi,

new user here, so howdy !

So i try to explain what i’m trying to achieve here – pdf watermarking with itextsharp.

Requirements:

• Each PDF file needs a watermark in this catalog.
• Each page of a pdf file needs a watermark.
• Watermark needs to be the name of the file without the file extension (.PDF).
• Watermark position fixed, say top-middle or bottom-middle of a page, pdf's are in A4 size always.
• Pdf's must keep their original file names and stay in the same folder "c:\ftp_out\test" after watermarking.

I must add i'm not a programmer so bear with me. But i'm learning :)

At one point i created a forum topic and asked for help:

http://stackoverflow.com/questions/13741160/watermark-existing-pdfs-before-ftping-them-in-visual-studio-2008

So i pretty much implemented everything there but as i ’m not programmer i don’t know how to define and use variables in this script.

Created a package variable „Pdf_To_Stamp“, created a for each loop container with a following collection, added the variable i mentioned earlier and gave initial value of 0 under "variable mappings"

PDF's are in the catalog "c:\ftp_out\test", "Files" value is "*.PDF", Fully qualified. No other settings for "foreach loop"

Inside of the foreach loop i placed a script task, readonlyvariables i put the "User::Pdf_To_Stamp" i mentioned earlier. the script it self is following:

using System;
using System.IO;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
using iTextSharp.text;
using iTextSharp.text.pdf;


namespace ST_f19c41b37b1247068cf0b6f35d026cfa.csproj
{
    [System.AddIn.AddIn("ScriptMain", Version = "1.0", Publisher = "", Description = "")]
    public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
    {


        public static byte[] Stamp(byte[] resource)
        {
            PdfReader reader = new PdfReader(resource);
            using (var ms = new MemoryStream())
            {
                using (PdfStamper stamper = new PdfStamper(reader, ms))
                {
                    PdfContentByte canvas = stamper.GetOverContent(1);
                    ColumnText.ShowTextAligned(
                      canvas,
                      Element.ALIGN_LEFT,
                      new Phrase("name of the pdf file without the extension (.PDF) needed "),
                      36, 540, 0
                    );
                }
                return ms.ToArray();
            }
        }
    }
}

But as you guessed correctly, it's not working :) So i'm clearly missing something here. I'm missing variables is my guess :)