It's critical to understand that , which means TLEN.LSP will NOT work on standard versions of AutoCAD LT .
Search for the script on established CAD community sites. Prominent portals like CADalyst, the Autodesk Community Forums, or the personal website of the original developer, Turvill (often credited with early versions of the total length LISP), are your safest options. Avoid downloading executable files ( .exe ); a legitimate LISP routine will always end in a .lsp extension. Step 2: Create the File Manually (Alternative)
Release the mouse. The command line will indicate that the routine has been initialized. Step 3: Running the TLen Command
: You can find the raw source code for TLEN.lsp on GitHub Gist , which you can copy into a text file and save with a .lsp extension. autocad tlenlsp download work
Because tlen.lsp is a popular community-driven tool, it is not an official Autodesk product. It is available on many forums and code-sharing sites.
Left-click, hold, and drag the file directly into the active AutoCAD drawing window.
(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) ) It's critical to understand that , which means TLEN
Avoid “TLEN.EXE” or “TLEN.DLL” files. You want a plain text file ending in .lsp .
APPLOAD says “loaded successfully,” but typing TLEN returns “Unknown command.”
Because AutoLISP files are written in plain text, you do not actually need to download a sketchy .lsp file from an unknown server. You can copy the code from a trusted forum, paste it into Notepad, and save the file manually as Tlen.lsp . Ensure you change the file extension from .txt to .lsp when saving. Step-by-Step Installation Guide Avoid downloading executable files (
The easiest method works for both AutoCAD and AutoCAD LT that support LISP:
. Because native AutoCAD tools often lack a single-click "sum" feature for disparate objects, this script is a staple for designers in fields like irrigation and electrical engineering. Key Resources and Downloads Source Code (GitHub Gist) : You can find a clean version of the script on GitHub Gist
How to Fix and Download AutoCAD TlenLSP for Better Productivity
Do not download .lsp files from random, unsecured forums or file-sharing sites. Malicious LISP routines can contain (command "_.erase" "_all" "") or viruses like ACAD.VLX .
Re-run the APPLOAD command to ensure it says "successfully loaded." If it did load, open the .lsp file in Notepad and look for the line starting with (defun c:...) . Whatever text follows the c: is the actual command you need to type into AutoCAD. 2. Security Options Blocking the Script