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(**
* stdio.sml - sample program using standard I/O of C
*
* @copyright (C) 2021 SML# Development Team.
* @author UENO Katsuhiro
* @version $Id: stdio.sml,v 1.7 2007/04/02 09:42:29 katsu Exp $
*)
type c_file = unit ptr
val fopen = _import "fopen" : (string, string) -> c_file
val fclose = _import "fclose" : c_file -> ()
fun fread (dst, len, file) =
_ffiapply _import "fread"
(dst : 'a array, _sizeof('a), len : int, file : c_file) : int
fun fwrite (dst, len, file) =
_ffiapply _import "fwrite"
(dst : 'a array, _sizeof('a), len : int, file : c_file) : int
fun printAry ary =
(Array.app (fn x => print (" " ^ Real.toString x)) ary;
print "\n")
(* create a file and write an real array to it. *)
val file = fopen ("test.bin", "wb")
val _ = if Pointer.isNull file then raise Fail "fopen failed" else ()
val data = Array.fromList [0.0, 1.0, 2.5, 3.1, ~104.6]
val _ = printAry data
val _ = fwrite (data, Array.length data, file)
val _ = fclose file
(* open the file and read the real array from it. *)
val file = fopen ("test.bin", "rb")
val _ = if Pointer.isNull file then raise Fail "fopen failed" else ()
val buf = Array.array (5, 0.0)
val _ = printAry buf
val _ = fread (buf, Array.length buf, file)
val _ = fclose file
val _ = printAry buf
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