c# - How to copy only hilighted text from pdf using itextsharp library? -

i have problem, not extract highlighted text pdf file. str variable empty. can me?

my code:

private static string getpdfhighlightext(string file, int page) {     string nv = "";     pdfreader reader = new pdfreader(file);     (int x = 1; x < reader.numberofpages; x++)     {         pdfdictionary pagedict = reader.getpagen(x);         pdfarray annots = pagedict.getasarray(pdfname.annots);         if (annots != null)         {              (int = 1; <= annots.size; ++i)             {                 pdfdictionary annotationdic = (pdfdictionary)pdfreader.getpdfobject(annots[i]);                 pdfname subtype = (pdfname)annotationdic.get(pdfname.subtype);                 if (subtype.equals(pdfname.highlight))                 {                      pdfstring str = annots.getasstring(i);                      nv = nv + str;                  }             }         }     }      return nv; } 

i'm using itextsharp library. pflibrary itextsharp.text.pdf namespace.

i want sweep pages pdf , extract highlighted texts, 245 pages put filter per page. can identify highlight annotations not returned string text highlighted

i managed solve problem following code:

    public string getpdflinks(string file,  int pgini, int pgfim)     {         progresso = 0;         //open our reader         pdfreader r = new pdfreader(file);         list<string> ret = new list<string>();          (int = pgini; <= pgfim; i++)         {              //get current page             pdfdictionary pagedictionary = r.getpagen(i);              //get of annotations current page             pdfarray annots = pagedictionary.getasarray(pdfname.annots);              //make sure have             if ((annots == null) || (annots.length == 0))                 return null;               //kjkjjj              //loop through each annotation             foreach (pdfobject in annots.arraylist)             {                 //convert itext-specific object generic pdf object                 pdfdictionary annotationdictionary = (pdfdictionary)pdfreader.getpdfobject(a);                  //make sure annotation has link                 if (!annotationdictionary.get(pdfname.subtype).equals(pdfname.link))                     continue;                  //make sure annotation has action                 if (annotationdictionary.get(pdfname.a) == null)                     continue;                  //get action current annotation                 pdfdictionary annotationaction = (pdfdictionary)annotationdictionary.get(pdfname.a);                  //test if uri action (there tons of other types of actions, of might mimic uri, such javascript, need handled seperately)                 if (annotationaction.get(pdfname.s).equals(pdfname.uri))                 {                     pdfstring destination = annotationaction.getasstring(pdfname.uri);                     if (destination != null)                         ret.add(destination.tostring());                 }             }              progresso++;         }          foreach (string link in ret)         {             resultado = resultado + link + "\n ";         }          return resultado;      }