calling a function in a struct ?

How would I go about calling a function defined within a struct ? 

typedef struct SDL_RWops {
  int (*seek)(struct SDL_RWops *context, int offset, int whence);
}

I have the FFI definitions:

(PROGN
    (EXPORT '(SEEK_P))
    (DEFCTYPE SEEK_P (:VOID *)))

(PROGN
    (EXPORT '(SDL_RWOPS))
    (DEFCSTRUCT
        SDL_RWOPS
        ((SEEK SEEK_P))))

Something like this ?

(setf func-pointer (ct:create-foreign-ptr))
(setf (ct:cpointer-value func-pointer) 
      (ct:cpointer-value (ct:cref SDL_RWOPS *rwops* seek)))

Which sets func-pointer to the address of the seek function. But how 
do I go about calling the function with parameters ?

-Luke


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