PageStamp.AlterContents() NullReferenceException

Question

Hi, this is the problem:

i've got this piece of code...

It keeps throwing a NullReferenceException at the stamp.AlterContents(); line.

i've got no clue on what's going on. Any help appreciated!

    public static byte[] concatAndAddContent(List<byte[]> pdf) 
    { 
        byte [] todos; 

        using(MemoryStream ms = new MemoryStream()) 
        { 
            Document doc = new Document(); 
            doc.Open(); 

            PdfCopy copy = new PdfCopy(doc, ms); 
            PdfCopyFields copy2 = new PdfCopyFields(ms); 


            PdfReader reader; 
            foreach (byte[] p in pdf) 
            { 
                reader = new PdfReader(p); 
                int pages = reader.NumberOfPages; 

                // loop over document pages 
                for (int i = 1; i <= pages; i++) 
                { 
                    PdfImportedPage page = copy.GetImportedPage(reader, i); 
                    PdfCopy.PageStamp stamp = copy.CreatePageStamp(page); 
                    PdfContentByte cb = stamp.GetUnderContent(); 
                    cb.SaveState(); 
                    stamp.AlterContents(); 
                    copy.AddPage(page); 
                } 
            } 

            doc.Close(); 
            todos = ms.GetBuffer(); 
            ms.Flush(); 
            ms.Dispose(); 
        } 

        return todos; 
    } 

i've got iTextSharp version 5.0.4 in VisualStudio 2010

Answer 1

Please post your exception stack trace.