Q: I have a PDF document and it has a bunch of links to other PDF
files in the same directory
I load it up just like here: http://www.pdftron.com/pdfnet/samplecode/AnnotationTest.java
I enumerate annotations and pick those that have e_Link type and their
actions are all e_GoToR and they have no destinations.
How do I get meaningful destinations for those links? I need those
links because they're pointing to other PDF files that I need to
follow (we're working on a filesystem-based PDF crawler).
Here is my code:
for (PageIterator itr = doc.getPageIterator(); itr.hasNext(); )
{
Page page = (Page)(itr.next());
int num_annots = page.getNumAnnots();
for (int i = 0; i < num_annots; ++i)
{
Annot annot = page.getAnnot(i);
if (annot.isValid() == false) continue;
if (annot.getType() == Annot.e_Link){
Link link = new Link(annot);
Action action = link.getAction();
if (action.isValid()){
int atype = action.getType(); // returns e_GoToR
// now what?
// action.getDest() throws an exception
// And action.getSDFObj() gives me a dictionary with
keys that have no meaning
}
}
}
}
Thank you!
---------------
A: If you search for ‘e_GoToR’ in PDFNet KB (http://groups.google.com/
group/pdfnet-sdk) you will a few relevant articles. The following are
some of the relevant entries:
http://groups.google.com/group/pdfnet-sdk/browse_thread/thread/99615701bd92c7ec/6d41439a8deaca46
// C# pseudocode (it should be simple to translate to JAVA)
int num_annots = page.GetNumAnnots();
for (int i=0; i<num_annots; ++i) {
Annot annot = page.GetAnnot(i);
if (annot.GetType() == Annot.Type.e_Link) {
Action action = annot.GetLinkAction();
if (action.GetType() == Action::e_GoTo) {
int page_num = action.GetDest().GetPage().GetIndex();
}
else if (action.GetType() == Action::e_GoToR) {
// A remote/external goto action...
Destination dest = action.GetDest();
// Get the file specification dict
Obj file_dict = action.GetSDFObj().Get("F").Value();
FileSpec file_spec = new FileSpec(file_dict);
String file_path = file_spec.GetFilePath();
}
}
http://groups.google.com/group/pdfnet-sdk/browse_thread/thread/9496c5b211eb1bb1/5f9f9664716d69dc
...