Get BSD file descriptor from OSX CoreServices objects

I am new to OSX user space development. I've read documentation and googled before asking, but still have no clue about the following.

If i am to use CoreServices framework to work with files (FSRef, Forks, URLs, etc.) will i be able to get a raw BSD file descriptor (plain i开发者_如何学Gont)? If yes, then how can i do that? The thing is, i want to learn to program with OSX frameworks, but the actual task at hand will require BSD file descriptor later.

Inso.

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Looks like there is really no way to do this. Oh well.