c# - Changing the zoom level in all link destinations in PDFs -


a code changes zoom level using itext in java given in @ itext home page. convert c#. after countless hours, have rewritten code find out didn't change link. means must have made errors.

edit:

as requested, please have @ simple pdf example.

my code follows:

using (var reader = new pdfreader(input)) {     using (var stamper = new pdfstamper(reader, ms))     {         (int = 1; <= reader.numberofpages; i++)         {             // page of pdf page             pdfdictionary page = reader.getpagen(i);              // annotations of page             pdfarray annotsarray = page.getasarray(pdfname.annots);              // if page not have annotations             if (annotsarray == null)             {                 continue;             }              // each annotation             (int j = 0; j < annotsarray.size; j++)             {                 // current annotation                 pdfdictionary annotation = annotsarray.getasdict(j);                  // test if link                 pdfdictionary annotationaction = annotation.getasdict(pdfname.a);                 if ( annotationaction == null || pdfname.link.equals(annotationaction.get(pdfname.s)) )                 {                     pdfarray d = annotation.getasarray(pdfname.dest);                     if (d != null && d.length == 5 && pdfname.xyz.equals(d.getasname(1)))                     {                         d[4] = new pdfnumber(150);                     }                 }              }         }     } }

original code in java shorter:

public void manipulatepdf(string src, string dest) throws ioexception, documentexception {         pdfreader reader = new pdfreader(src);         pdfdictionary page = reader.getpagen(11);         pdfarray annots = page.getasarray(pdfname.annots);          (int = 0; < annots.size(); i++) {             pdfdictionary annotation = annots.getasdict(i);             if (pdfname.link.equals(annotation.getasname(pdfname.subtype))) {                 pdfarray d = annotation.getasarray(pdfname.dest);                 if (d != null && d.size() == 5 && pdfname.xyz.equals(d.getasname(1)))                     d.set(4, new pdfnumber(0));             }         }         pdfstamper stamper = new pdfstamper(reader, new fileoutputstream(dest));         stamper.close();     }

updated edit 2

thanks @mkl i've came solution.

for (int = 1; <= reader.numberofpages; i++) {     pdfdictionary page = reader.getpagen(i);      pdfarray annotsarray = page.getasarray(pdfname.annots);      if (annotsarray == null)     {         continue;     }      (int j = 0; j < annotsarray.size; j++)     {         pdfdictionary annotation = annotsarray.getasdict(j);          pdfdictionary annotationaction = annotation.getasdict(pdfname.a);         if (pdfname.goto.equals(annotationaction.get(pdfname.s)))         {             pdfarray d = annotationaction.getasarray(pdfname.d);             if (d != null)             {                 console.writeline(d[4]);                 d[4] = new pdfnumber(1.20);             }          }      } }

if @ specification of link annotations, see

a dictionary (optional; pdf 1.1) action shall performed when link annotation activated (see 12.6, “actions”).

dest array, name or byte string (optional; not permitted if a entry present) destination shall displayed when annotation activated (see 12.3.2, “destinations”).

(table 173 – additional entries specific link annotation - iso 32000-1)

i.e. both original java code , port handle 1 kind of link annotations, kind using dest entry.

inspecting sample pdf, though, 1 finds link annotations a entry, e.g.

/a <<     /d  [ 1 /xyz 0.000001 842 0.724 ]        /s  /goto    >>

thus, code has consider possible options. in particular if pdf manipulate has action defined instead of destination, has process destination of action instead of merely non-existent link destination.


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