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Simple .NET PDF Merger

, 17 Nov 2014 GPL3
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A simple .NET PDF merger that supports header and footer text.

Introduction

There are a couple of PDF mergers available on the Internet. But, either they are commercial products or don't support printing of the header and/or footer text, which is particularly interesting, e.g., to print the page number.

Background

The presented PDF merger uses the open source PDF library iTextSharp to process PDF files. The sample solution also includes a tiny Windows Forms application to demonstrate the functionality.

Using the code

For the merge process, the PDF library takes advantage of the PDF page events of the iTextSharp.text.pdf.PdfWriter object. During the initialization of the PdfPageEvent instance (which inherits from iTextSharp.text.pdf.IPdfPageEvent), necessary information for the header/footer text could be passed in to the constructor call:

<s>writer.PageEvent = new PdfPageEvents(/*Any type of information goes here*/);</s>

It is important that the header and the footer text, both, are rendered in the 'public void OnEndPage(PdfWriter writer, Document document)' method. The 'public void OnStartPage(PdfWriter writer, Document document)' is not accurate.

For performance reasons, this library is now leveraging the PdfCopy class from the iTextSharp library instead of the described method above.

Even though the shown sample is very basic, it generally gives a good overview of how the header and the footer can be populated, e.g., with picture(s), text(s)...

The source code

using System;
using System.Collections.Generic;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace HelveticSolutions.PdfLibrary
{
    public static class PdfMerger
    {
        /// <summary>
        /// Merge pdf files.
        /// </summary>
        /// <param name="sourceFiles">PDF files being merged.</param>
        /// <returns></returns>
        public static byte[] MergeFiles(List<byte[]> sourceFiles)
        {
            Document document = new Document();
            using (MemoryStream ms = new MemoryStream())
            {
                PdfCopy copy = new PdfCopy(document, ms);
                document.Open();
                int documentPageCounter = 0;

                // Iterate through all pdf documents
                for (int fileCounter = 0; fileCounter < sourceFiles.Count; fileCounter++)
                {
                    // Create pdf reader
                    PdfReader reader = new PdfReader(sourceFiles[fileCounter]);
                    int numberOfPages = reader.NumberOfPages;

                    // Iterate through all pages
                    for (int currentPageIndex = 1; currentPageIndex <= numberOfPages; currentPageIndex++)
                    {
                        documentPageCounter++;
                        PdfImportedPage importedPage = copy.GetImportedPage(reader, currentPageIndex);
                        PdfCopy.PageStamp pageStamp = copy.CreatePageStamp(importedPage);

                        // Write header
                        ColumnText.ShowTextAligned(pageStamp.GetOverContent(), Element.ALIGN_CENTER,
                            new Phrase("PDF Merger by Helvetic Solutions"), importedPage.Width / 2, importedPage.Height - 30,
                            importedPage.Width < importedPage.Height ? 0 : 1);

                        // Write footer
                        ColumnText.ShowTextAligned(pageStamp.GetOverContent(), Element.ALIGN_CENTER,
                            new Phrase(String.Format("Page {0}", documentPageCounter)), importedPage.Width / 2, 30,
                            importedPage.Width < importedPage.Height ? 0 : 1);

                        pageStamp.AlterContents();

                        copy.AddPage(importedPage);
                    }

                    copy.FreeReader(reader);
                    reader.Close();
                }

                document.Close();
                return ms.GetBuffer();
            }
        }
    }
}

History

  • 01.08.2008 - Article created.
  • 17.11.2014 - Updated implementation based on other user's feedback.

License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

Michael Ulmann
Architect Helvetic Solutions
Australia Australia
MCAD, MCPD Web Developer 2.0, MCPD Enterprise Developer 3.5
 
My company: Helvetic Solutions
My blog: Sitecore Experts
 
Hopp Schwiiz Smile | :)

Comments and Discussions

 
QuestionGreat! PinmemberAleBrozzo20-Mar-12 19:51 
AnswerRe: Great! PinmemberMichael Ulmann13-Nov-14 20:10 
QuestionTHANK YOU! PinmemberMember 340683825-Jan-12 6:04 
AnswerRe: THANK YOU! PinmemberMichael Ulmann18-Mar-12 14:06 
GeneralRe: THANK YOU! PinmemberMember 987752922-Sep-13 23:47 
GeneralMy vote of 5 Pinmemberjuniorsebr22-Jul-10 3:37 
GeneralRe: My vote of 5 PinmemberMichael Ulmann13-Nov-14 20:11 
GeneralPdfContentByte has a method called ShowTextAligned PinmemberRubyPdf25-May-10 14:28 
please use this implement
_content.ShowTextAligned(Rectangle.ALIGN_CENTER, headerText, writer.PageSize.Width / 2, writer.PageSize.Height - 10, 0);
 
to replace the following implement,
_content.SetTextMatrix(GetCenterTextPosition(headerText, writer), writer.PageSize.Height - 10);
_content.ShowText(headerText);

GeneralInformative article Pinmembersuraj mehare2-Mar-10 8:06 
GeneralRe: Informative article PinmemberMichael Ulmann2-Mar-10 20:02 
QuestionHow to bookmark by each PDF creation time Pinmemberorlandito2030-Apr-09 23:08 
QuestionHow to bookmark by each PDF file name PinmemberSaam_cse27-Nov-08 23:49 
AnswerRe: How to bookmark by each PDF file name PinmemberMichael Ulmann1-Dec-08 12:25 
GeneralRe: How to bookmark by each PDF file name PinmemberSaam_cse2-Dec-08 0:23 
GeneralRe: How to bookmark by each PDF file name Pinmemberfriendmastor25-Aug-09 16:24 
QuestionMerge Large Amount of files Pinmemberastaykov7-Aug-08 2:02 
AnswerRe: Merge Large Amount of files PinmemberMichael Ulmann7-Aug-08 13:52 
QuestionHow to pass arguments PinmemberVäinölä Harri1-Aug-08 4:10 
AnswerRe: How to pass arguments PinmemberMichael Ulmann1-Aug-08 15:38 
GeneralRe: How to pass arguments PinmemberVäinölä Harri3-Aug-08 21:02 

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