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I have an object of type CGPDFDictionaryRef returned somehow from a method that is considered as a part of a static library (so I do not have access to its code to modify it), however, I want to know the name of the PDF file that this dictionary object holds ? how can I query it to get the name of the file?
The CGPDF* functions are a function-based mechanism to get to the series of arrays, dictionaries, integers, string and name elements in PDF documents. PDF documents themselves are really just composed of these “basic” elements. If you’d like some light reading check out the ~1500 page PDF specification sometime. As rob mayoff stated, you are basically pointing to memory once you have a CGPDFDocumentRef.
That being said, there is no value that is guaranteed within a PDF structure that will give you the filename. Download Voyeur and dig around your PDF to look around and prove me wrong (I could be).
Here’s the sample of the true contents of a PDF: