C#使用iTextSharp将PDF转成文本的方法

本文实例讲述了C#使用iTextSharp将PDF转成文本的方法。分享给大家供大家参考。具体实现方法如下：

using System;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
public class ParsingPDF {
 static string PDF;
 static string TEXT2;
 /**
  * Parses the PDF using PRTokeniser
  * @param src the path to the original PDF file
  * @param dest the path to the resulting text file
  */
 public void parsePdf(String src, String dest)
 {
   PdfReader reader = new PdfReader(src);
   StreamWriter output = new StreamWriter(new FileStream(dest, FileMode.Create));
   int pageCount = reader.NumberOfPages;
   for (int pg = 1; pg <= pageCount; pg++)
   {
     // we can inspect the syntax of the imported page
     byte[] streamBytes = reader.GetPageContent(pg);
     PRTokeniser tokenizer = new PRTokeniser(streamBytes);
     while (tokenizer.NextToken())
     {
       if (tokenizer.TokenType == PRTokeniser.TokType.STRING)
       {
         output.WriteLine(tokenizer.StringValue);
       }
     }
   }
   output.Flush();
   output.Close();
 }
 /**
  * Main method.
  */
 static void Main(string[] args)
 {
   if (args.Length < 1 || args.Length > 2)
   {
     Console.WriteLine("USAGE: ParsePDF infile.pdf <outfile.txt>");
     return;
   }
   else if (args.Length == 1)
   {
     PDF = args[0];
     TEXT2 = Path.GetFileNameWithoutExtension(PDF) + ".txt";
   }
   else
   {
     PDF = args[0];
     TEXT2 = args[1];
   }
   try
   {
     DateTime t1 = DateTime.Now;
     ParsingPDF example = new ParsingPDF();
     example.parsePdf(PDF, TEXT2);
     DateTime t2 = DateTime.Now;
     TimeSpan ts = t2 - t1;
     Console.WriteLine("Parsing completed in {0:0.00} seconds.", ts.TotalSeconds);
   }
   catch (Exception ex)
   {
     Console.WriteLine("ERROR: " + ex.Message);
   }
 } // class
 public class MyTextRenderListener : IRenderListener
 {
   /** The print writer to which the information will be written. */
   protected StreamWriter output;
   /**
    * Creates a RenderListener that will look for text.
    */
   public MyTextRenderListener(StreamWriter output)
   {
     this.output = output;
   }
   public void BeginTextBlock()
   {
     output.Write("<");
   }
   public void EndTextBlock()
   {
     output.WriteLine(">");
   }
   public void RenderImage(ImageRenderInfo renderInfo)
   {
   }
   public void RenderText(TextRenderInfo renderInfo)
   {
     output.Write("<");
     output.Write(renderInfo.GetText());
     output.Write(">");
   }
 } // class
} // namespace

希望本文所述对大家的C#程序设计有所帮助。