效果如图：

链接如下：

http://www.turvill.com/t2/free_stuff/tlen.lsp

如果不愿意打开，可以在此复制源程序：

;|TLEN.LSP - Total LENgth of selected objects(c) 1998 Tee Square Graphics|;(defun C:TLEN (/ ss tl n ent itm obj l) (setq ss (ssget) tl 0 n (1- (sslength ss))) (while (>= n 0) (setq ent (entget (setq itm (ssname ss n))) obj (cdr (assoc 0 ent)) l (cond ((= obj "LINE") (distance (cdr (assoc 10 ent))(cdr (assoc 11 ent)))) ((= obj "ARC") (* (cdr (assoc 40 ent)) (if (minusp (setq l (- (cdr (assoc 51 ent)) (cdr (assoc 50 ent))))) (+ pi pi l) l))) ((or (= obj "CIRCLE")(= obj "SPLINE")(= obj "POLYLINE") (= obj "LWPOLYLINE")(= obj "ELLIPSE")) (command "_.area" "_o" itm) (getvar "perimeter")) (T 0)) tl (+ tl l) n (1- n))) (alert (strcat "Total length of selected objects is " (rtos tl))) (princ))