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PL_get_string_chars()
Availability:C-language interface function
int PL_get_string_chars(term_t +t, char **s, size_t *len)
If t is a string object, store a pointer to a 0-terminated C-string in s and the length of the string in len. Note that this pointer is invalidated by backtracking, garbage collection and stack-shifts, so generally the only safe operations are to pass it immediately to a C function that doesn't involve Prolog.
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