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reading from txt file

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reading from txt file charlysangel 08 Jul 08:32
2019-07-08 08:32:54 UTC (11 months ago)
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reading from txt file

Hi !

I want to create a multi-layer file by reading from a txt file x/y position and image name.

I've tried to read from file with code below

(let* ((fd (fopen filename))) (let* (
(c (fread 1 fd))
(res "")
(while (and c (not (equal? c " "))) (set! res (string-append res c)) (set! c (fread 1 fd)))
(if (equal? res "")
(cons (string->number res) ())
(gimp-message (string-append "PosX: " (number->string res))) )

I do not understand why it returns :"Error: eval: unbound variable: res "

Could you help, please ?