Q:
If I do a .IsFree on the the Obj returned by doc.GetTrailer object it seems to always report true??? But if i ignore that and do an .IsDict it also answers true, and I can work with a getDictIterator
I’m not quite sure if this is what you are saying with the second line in this quote:
"You can use GetType() or obl.Is???() member functions to find out type-information at run time, however most of the time the type can be inferred from the PDF specification.
Therefore when you call doc.GetTrailer() you can assume that returned object is a dictionary. If there is any ambiguity use Is???() methods." from here http://www.pdftron.com/pdfnet/html/classpdftron_1_1SDF_1_1Obj.html
A:
This is correct behavior, since Trailer is not part of the cross-reference table. Some view it as the first entry in the xref table (which is always marked as free).