method_format / atom_setformat

    do.while
    Feb 11 2014 | 5:37 pm
    Hi !
    ive reached the point where i would like to provide arguments though sprintf like formatting . with these functions :
    
atom_setformat(long *ac, t_atom **av, C74_CONST char *format,...);

object_method_format(t_object *x, t_symbol *s, t_atom *rv, C74_CONST char *format,...);
    unfortunately it seem not to be working using sprintf like character substitutions with methods above :
    
sprintf(*str, "%d %s %d", 1 , word , 2);
    is there something that im missing ?