PDF traversal

as mention in pdf 32000
pdf structure is like below image
what is the best solution for traversal this structure?
something like this or not
CosDoc cdoc;
cdoc = PDDocGetCosDoc(myPDDoc2);
CosObj cosOBJ=CosDocGetRoot(cdoc);
CosType t = CosObjGetType(cosOBJ);
CosObj obj2= CosDictGet(cosOBJ,ASAtomFromString("Pages"));
CosObj obj3= CosDictGet(obj2,ASAtomFromString("Kids"));
CosObj kid1 = CosArrayGet(obj3,0);
CosObj cosst = CosDictGet(kid1,ASAtomFromString("Contents"));
CosObj resou = CosDictGet(kid1,ASAtomFromString("Resources"));
PDEContent pddd=PDEContentCreateFromCosObj(&cosst,&resou);
int jjj=PDEContentGetNumElems(pddd);
for(int i=0;i<jjj;i++)
PDEElement ele=PDEContentGetElem(pddd,i);
this elemnt is base of pdf structure or not
is there any function for determine the cos object type (Pages , dictionarys, Kids ,....)?
i want to traversal the pdf structure for create a same pdf file (dont want use copy or any thing like that i want traversal to details then make another copy of pdf ( and maybe do some little changes in contents not structure ))
is there any way you can show me ?

1. The structure illustrated shows only PDF objects, both direct and indirect. You go beyond this into looking at the PDF contents as objects. This (PDF contents as objects) is not from 32000-1 at all. 32000-1 defines only contents as streams of operators and operands. PDFEdit is an abstraction of this to make editing simpler, to save you parsing PDF streams.
2. You can get object type. Look at the object methods starting CosObj. Look also at the options for enumerating objects, as that is the only way you can get a full list of the keys used in a dictionary.
3. It is entirely possible to duplicate objects or collections of objects (e.g. pages) into other PDFs by precisely examining Cos structure, duplicating stream contents etc. Beware! Some PDF files have recursive references. If you do not trap this your code will never finish,

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Please remember to mark the replies as answers if they help and unmark them if they provide no help.

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