ExtractArea.cs

/*
 * This class is part of the book "iText in Action - 2nd Edition"
 * written by Bruno Lowagie (ISBN: 9781935182610)
 * For more info, go to: http://itextpdf.com/examples/
 * This example only works with the AGPL version of iText.
 */
using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using Ionic.Zip;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;

namespace kuujinbo.iTextInAction2Ed.Chapter15 {
  public class ExtractPageContentArea : IWriter {
// ===========================================================================
    /** The original PDF that will be parsed. */
    public readonly string PREFACE = Path.Combine(
      Utility.ResourcePdf, "preface.pdf"
    );    
    /** The resulting text file. */
    public const String RESULT = "preface_clipped.txt";
// --------------------------------------------------------------------------- 
    public void Write(Stream stream) {
      using (ZipFile zip = new ZipFile()) {
        zip.AddFile(PREFACE, "");
        PdfReader reader = new PdfReader(PREFACE);
        System.util.RectangleJ rect = new System.util.RectangleJ(
          70, 80, 420, 500
        );
        RenderFilter[] filter = {new RegionTextRenderFilter(rect)};
        ITextExtractionStrategy strategy;
        StringBuilder sb = new StringBuilder();
        for (int i = 1; i <= reader.NumberOfPages; i++) {
          strategy = new FilteredTextRenderListener(
            new LocationTextExtractionStrategy(), filter
          );
          sb.AppendLine(
            PdfTextExtractor.GetTextFromPage(reader, i, strategy)
          );
        }        
        zip.AddEntry(RESULT, sb.ToString());
        zip.Save(stream);             
      }
    }
// ===========================================================================
  }
}