[poppler] Problem getting object identifier

[Brad Hards]

Hopefully this is a pretty simple poppler problem: given a Dict (or the Object 
that encompasses it), how do I get the object identifer (e.g. the number that 
appears in the PDF file).

For example, given a dictionary entry:
35 0 obj<</Type/OCG/Name(Watermark)/Usage<</Print<</PrintState/OFF>>>>>>

How do I get 35?

I realise that there won't be one for every object (e.g. the Print dictionary 
doesn't have a direct entry number), but I'm happy to confirm that there will 
be one for each case I'm worried about.

Brad
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