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accessing text in a pdf document

 
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gary



Joined: 25 Feb 2007
Posts: 1
PostPosted: Mon Feb 26, 2007 10:00 pm    Post subject: accessing text in a pdf document Reply with quote
Hi there all... I've tried creating a few test applications to answer this question, but cannot figure it out!

Can someone give me a simple example showing how to extract all the text in a pdf document into a single string? I would *greatly* appreciate any help you can provide!
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aknuth



Joined: 23 Mar 2007
Posts: 16
Location: Berlin
PostPosted: Wed May 16, 2007 5:46 pm    Post subject: Reply with quote
Hello,
this is a very dirty solution, but it shows one way to get what you want. You do have to mind about encoding properly, as the example assumes, that the pdf text is encoded in default system encoding.

it extracts text from the first page only.

Code:
string pdfTextRegexp = @"(T[wdcm*])[\s]*(\[([^\]]*)\]|\((?<text>[^\)]*)\))[\s]*Tj";

PdfDocument r = PdfReader.Open(file);
PdfContents contents = r.Pages[0].Contents;
foreach (PdfReference o in contents.Elements) {
   PdfContent c = o.Value as PdfContent;
   if (c != null) {
      string content = Encoding.Default.GetString(c.Stream.Value);
      using (StringReader sr = new StringReader(content)) {
         string line;
         while ((line = sr.ReadLine()) != null) {
            Match m = Regex.Match(line, pdfTextRegexp, RegexOptions.Compiled);
            if (m.Success) {
               Debug.WriteLine(m.Groups["text"].Value);
            }
         }
      }
   }
}


Anyone who has a better solution, hopefully using the PDFsharp api, please contribute.

Regards,
André
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