Place TLEN.LSP in a dedicated folder, e.g.: C:\CAD\LISPS\ or C:\Users\[YourName]\AppData\Roaming\Autodesk\ApplicationPlugins
Newer versions of AutoCAD have enhanced security variables that prevent scripts from executing outside of "trusted locations." If your script fails to run, type SECURELOAD in the command line and change the value to 0 (disabled) or 1 (warn before loading), or add the folder path of your LISP file to your trusted paths in OPTIONS > > Trusted Locations . If you'd like to get the script running smoothly, tell me: What version of AutoCAD are you using? Are you getting a specific error message ?
If you are using (Light), the Tlen.lsp download will not work. Historically, AutoCAD LT does not feature native support for AutoLISP, ObjectARX, or VBA scripts. You will need a full version of AutoCAD or specialized third-party plugins to run LISP files. 4. Secure Loading Settings ( SECURELOAD ) autocad tlenlsp download work
This is a popular, clean version of the code often cited in Autodesk community forums.
The source code is widely available via community repositories: GitHub Gists: Standard scripts can be found on GitHub Gist (TLEN.lsp) Autodesk App Store: For a more formal installation, the TotalLength Plugin provides similar functionality through an installer. B. Loading into AutoCAD Manual Load: Open AutoCAD and type in the command line. File Selection: Browse to the directory where the file was saved. Security Approval: Place TLEN
If you downloaded the file but the command fails to run, look out for these common issues: 1. "Unknown Command" Error
Do you need the output or an on-screen table? Share public link If you are using (Light), the Tlen
This happens when the TLEN.LSP routine was not loaded successfully, or an old version of TLEN is conflicting with another command. AutoCAD falls back to its own closest‑matching command name.
(alert (strcat “Total length of selected objects is ” (rtos tl)))