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Get properties from a PDF file

/ Published in: C#
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Provide the PDF document content as a string and it will return the data content of properties like Title or Subject.

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  1. private static string GetPropertyValueEx(string pdfData, string propertyName)
  2. {
  3.     var result = "";
  4.  
  5.     var propertyNameLength = propertyName.Length + 3;
  6.     var leadLength = 4;
  7.  
  8.     var r2 = new Regex(string.Format("/{0} <[A-Za-z0-9]*>", propertyName));
  9.     var m = r2.Match(pdfData);
  10.     if (m.Success)
  11.     {
  12.         //System.Diagnostics.Debug.WriteLine(m.Index);
  13.         var valueRaw = m.Value.Substring(propertyNameLength, m.Value.Length - propertyNameLength - 1);
  14.         for (int i = leadLength; i < valueRaw.Length; i = i + 4)
  15.         {
  16.             var hexVal = valueRaw.Substring(i, 4);
  17.             var num = (Convert.ToUInt32(hexVal, 16));
  18.             result += (char)num;
  19.         }
  20.     }
  21.  
  22.     return result;
  23. }

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