Itextsharp cropping pdf pages

Question

I have a pdf document that has form fields that I fill out programmatically with C #. Depending on three conditions, I need to trim (delete) some pages from this document.

Can this be done?

for condition 1: I need to store pages 1-4, but delete pages 5 and 6

for condition 2: I need to save pages 1-4, but delete 5 and save 6

for condition 3: I need to save pages 1-5, but delete 6

Answer 1

Instead of deleting pages in a document, what you are actually doing is creating a new document and importing only those pages that you want to save. Below is the complete WinForms working application that does this (targeting iTextSharp 5.1.1.0). The final parameter to the removePagesFromPdf function is the array of pages to save.

The code below works with physical files, but it will be very easy to convert it to something based on threads so you don't have to write to disk if you don't want to.

 using System; using System.ComponentModel; using System.IO; using System.Linq; using System.Windows.Forms; using iTextSharp.text.pdf; using iTextSharp.text; namespace Full_Profile1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //The files that we are working with string sourceFolder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop); string sourceFile = Path.Combine(sourceFolder, "Test.pdf"); string destFile = Path.Combine(sourceFolder, "TestOutput.pdf"); //Remove all pages except 1,2,3,4 and 6 removePagesFromPdf(sourceFile, destFile, 1, 2, 3, 4, 6); this.Close(); } public void removePagesFromPdf(String sourceFile, String destinationFile, params int[] pagesToKeep) { //Used to pull individual pages from our source PdfReader r = new PdfReader(sourceFile); //Create our destination file using (FileStream fs = new FileStream(destinationFile, FileMode.Create, FileAccess.Write, FileShare.None)) { using (Document doc = new Document()) { using (PdfWriter w = PdfWriter.GetInstance(doc, fs)) { //Open the desitination for writing doc.Open(); //Loop through each page that we want to keep foreach (int page in pagesToKeep) { //Add a new blank page to destination document doc.NewPage(); //Extract the given page from our reader and add it directly to the destination PDF w.DirectContent.AddTemplate(w.GetImportedPage(r, page), 0, 0); } //Close our document doc.Close(); } } } } } } 

Answer 2

Use PdfReader.SelectPages () in combination with PdfStamper. The code below uses iTextSharp 5.5.1.

 public void SelectPages(string inputPdf, string pageSelection, string outputPdf) { using (PdfReader reader = new PdfReader(inputPdf)) { reader.SelectPages(pageSelection); using (PdfStamper stamper = new PdfStamper(reader, File.Create(outputPdf))) { stamper.Close(); } } } 

Then you call this method with the correct page selection for each condition.

Condition 1:

 SelectPages(inputPdf, "1-4", outputPdf); 

Condition 2:

 SelectPages(inputPdf, "1-4,6", outputPdf); 

or

 SelectPages(inputPdf, "1-6,!5", outputPdf); 

Condition 3:

 SelectPages(inputPdf, "1-5", outputPdf); 

Here is the iTextSharp source code comment on what constitutes page selection. This is in the SequenceList class, which is used to handle page selection:

 /** * This class expands a string into a list of numbers. The main use is to select a * range of pages. * <p> * The general systax is:<br> * [!][o][odd][e][even]start-end * <p> * You can have multiple ranges separated by commas ','. The '!' modifier removes the * range from what is already selected. The range changes are incremental, that is, * numbers are added or deleted as the range appears. The start or the end, but not both, can be ommited. */ 

Answer 3

Here is the code that I use to copy everything except the last page of an existing PDF. All in memory streams. The pdfByteArray variable is the byte [] of the original pdf obtained using ms.ToArray (). pdfByteArray is overwritten with a new PDF file.

  PdfReader originalPDFReader = new PdfReader(pdfByteArray); using (MemoryStream msCopy = new MemoryStream()) { using (Document docCopy = new Document()) { using (PdfCopy copy = new PdfCopy(docCopy, msCopy)) { docCopy.Open(); for (int pageNum = 1; pageNum <= originalPDFReader.NumberOfPages - 1; pageNum ++) { copy.AddPage(copy.GetImportedPage(originalPDFReader, pageNum )); } docCopy.Close(); } } pdfByteArray = msCopy.ToArray();