is there a way to access the top-level printing facilities from a program?

e.g., ocaml toploop will print a complex structure nicely:
# let x = make_my_huge_struct ();;
val x : my_huge_struct =
{a = 1; b = 2; c = 3; ...}

how do I access this from a program?
e.g., if I have an array of my_huge_struct, I want to be able to examine
a part of it:

let show_part arr p1 p2 =
  for i = p1 to p2 do
    ocaml_toploop_print (Array.get arr i)
  done

# show_part array_of_huge_structs 100 105;;

(in lisp I would do
 (loop :for i :from p1 :to p2 :do (print (aref array_of_huge_structs i))))

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