Hi, Can someone tell me why this script works perfectly well with Windows:MIT/GNU-Scheme and fails on Windows:Gimp2.4/TinyScheme ? It should create a file (whose name is given as an argument) which looks like this : ____________ beginning of the file having 4096 lines______ 0 0 0 0.8 0 1.6 0 2.4 0 3.2 0 4 0 4.8 0 5.6 0 6.4 . . . 0 44.8 0 45.6 0 46.4 0 47.2 0 48 0 48.8 0 49.6 0 50.4 0.8 0 0.8 0.8 0.8 1.6 0.8 2.4 0.8 3.2 0.8 4 . . . ... . . . 50.4 42.4 50.4 43.2 50.4 44. 50.4 44.8 50.4 45.6 50.4 46.4 50.4 47.2 50.4 48. 50.4 48.8 50.4 49.6 50.4 50.4 ______________end of the file_________ for the argument inPas given equal to 8. Instead, with Gimp2.4, there always is an error and my file ends too soon : _______beginning of the file having far less than 4096 lines______ 0 0 0 0.8 0 1.6 0 2.4 0 3.2 0 4 0 4.8 0 5.6 0 6.4 . . . 11.2 32.8 11.2 33.6 11.2 34.4 11.2 35.2 11.2 36 11.2 36.8 11.2 37.6 11.2 Error: set-output-port: needs 1 argument(s) ______________end of the file_________ My script uses 4 procedures : 1 main and 3 auxiliary procedures (on Gimp as on MIT): ;; the construct-list procedure which increments the first number : (define (construct-list row height width pas port) (cond ((< row height) (construct-list (+ row pas) height width pas (construct-list-col (/ row 10.0) 0 width pas port)) ) (else port) ) ) ;; the construct-list-col procedure which increments the second number : (define (construct-list-col x col width pas port) (cond ((< col width) (element->port x port) (element->port (/ col 10.0) port) (newline port) (construct-list-col x (+ col pas) width pas port) ) (else port) ) ) ;;the element->port procedure which actually writes to the file (define (element->port x port) (if (number? x) (begin (write x port) (write-char #\space port) ) ) ) ;; the main procedure (define (script-fu-exp-medit inFileName inPas ) (define (subscript tour p) (cond ((= tour 0) (subscript 1 (construct-list 0 ; row 512 ;heigt 512 ;width inPas p ) ) ) (else (close-output-port p) ) ) ) (subscript 0 (open-output-file inFileName)) ) on MIT/GNU Scheme, I call : (script-fu-exp-medit "the-name-of-a-file" 8) on Gimp2.4/TinyScheme, I use : (script-fu-register "script-fu-exp-medit" ;func name "Export Medit" ;menu label "Exports the current image layer as a Medit file." ;description "My Name" ;author "copyright 2008, My Name" ;copyright notice "Mars 6, 2008" ;date created "RGB*" ;image type that the script works on SF-FILENAME "Fichier en sortie " "C:\\gimp-2.4\\production\\remplir_Ici" ;a string variable SF-ADJUSTMENT "taille du pas" '(8 1 256 1 10 0 1) ) (script-fu-menu-register "script-fu-exp-medit" "Somewhere" ) Any ideas? Thank you for reading and sorry for the long post.