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Re: printed representation -> C string

try this:

(define (obj->string obj)
  (define (display-obj port) (display obj port))
  (call-with-output-string display-obj))

then, turn

 SCM the_results = gh_eval_str ( str );

into

 wrapped = strcat3 ( "(obj->string ", str, ")" );
 SCM the_results = gh_eval_str ( wrapped );

at this point, `the_results', should be a string.

thi