AutoCAD

How to Command Lisp in AutoCAD?

by Wei Zhang
4 min read

Understanding the Use of LISP in AutoCAD

Utilizing LISP within AutoCAD enhances functionality and automates tasks that are traditionally manual, streamlining the design process. Here’s a comprehensive guide on how to command LISP in AutoCAD.

How to Execute a LISP Routine in AutoCAD

  1. Access the Custom User Interface (CUI) Command:
    Open AutoCAD and type CUI in the command line. Hit enter.

  2. Select the Desired CUI File:
    From the CUI editor, locate and select acad.cuix or any custom .cuix file you have.

  3. Navigate to the LISP Files Section:
    Find the section labeled ‘LISP Files’ within the CUI window. Right-click on it to reveal options.

  4. Load the Required LISP File:
    In the context menu, select the option to "Load LISP." You will then browse to the location where your LISP file is saved.

  5. Select and Confirm the File:
    Click on the desired LISP file and confirm by selecting Open.

  6. Finalize Changes:
    Click Apply and then Close to exit the CUI editor and finish loading your LISP routine.

How to Execute a LISP File

For those using a command-line interface:

  1. Authenticate Your Environment:
    Once logged into your system, type lisp at the prompt and press Enter.

  2. Alternative Method Using Emacs:
    If you prefer using Emacs, press Esc and then x, type run-lisp, and hit Enter. This opens LISP mode, allowing you to load your LISP files easily.

Editing LISP Routines in AutoCAD

  1. Initiate the APPLOAD Command:
    Start AutoCAD and type APPLOAD into the command line, then press Enter.

  2. Access the Startup Suite:
    In the APPLOAD dialog, click on the Contents button found under the Startup Suite category.

  3. Manage LISP Scripts:
    Select any LISP script you wish to remove and click the Remove button.

  4. Close the Dialog:
    After making your changes, click Close to exit the window.

Loading LISP Files in AutoCAD 2025

  1. Access APPLOAD:
    Begin by typing the command APPLOAD in the command line and press Enter.

  2. Open the Startup Suite:
    Within the APPLOAD dialog, click on the Contents button related to the Startup Suite.

  3. Add New LISP Files:
    Click the Add button and navigate to the folder containing your LISP files. Select the file you want to include.

  4. Confirm and Close:
    Once your files are added, click Close to finish.

Software for Developing LISP Programs

For LISP development on Windows, CLISP is recommended as it offers a compliant GNU Common LISP environment. It effectively mimics a Unix-like setting using MingW, facilitating ease of use for LISP-based tasks.

Saving a LISP Program

To save your AutoLISP program effectively:

  1. Copy the Code:
    Highlight your LISP code and press Ctrl + C to copy it.

  2. Utilize a Text Editor:
    You can save this code using Visual LISP Editor or even a simple text editor like Notepad. Ensure to save with the .lsp extension for AutoCAD compatibility.

Understanding LISP Routines

LISP routines are custom scripts designed to automate repetitive tasks in AutoCAD. With LISP, users can create unique functions that extend the software’s capabilities, optimizing workflow and productivity.

Editing LISP Files

To edit existing LISP files, you can utilize the following method:

  1. Open Visual LISP Editor:
    Launch AutoCAD and navigate to the Tools menu. Select AutoLISP and then choose Visual LISP Editor. You can also enter VLIDE or VLISP in the command line.

  2. Load Your File for Editing:
    Within the Visual LISP Editor, access the file you wish to edit and make necessary adjustments.

Starting a LISP Routine

To initiate a LISP routine:

  1. Use the CUI Command:
    Enter CUI in the command line and locate the LISP Files category in the customization options.

  2. Load the LISP Routine:
    Right-click on the LISP Files section, select Load Lisp, and pinpoint the location of your LISP file to complete the process.

Why AutoCAD Utilizes LISP

LISP is favored for its ability to handle the unstructured and exploratory nature of design tasks. Unlike more rigid programming languages, LISP provides flexibility and interactive problem-solving capabilities, aligning perfectly with the dynamic environment of CAD design.

Frequently Asked Questions

1. Can AutoCAD LT Run LISP Routines?
No, AutoCAD LT does not support LISP routines, nor is the APPLOAD command available.

2. What is the difference between AutoLISP and Visual LISP?
AutoLISP is the original LISP dialect tailored for AutoCAD, while Visual LISP offers enhanced development tools and a more user-friendly interface.

3. How can I troubleshoot LISP errors in AutoCAD?
Common debugging can be performed in the Visual LISP Editor by using the debugger tools available. Make sure to check syntax errors and ensure that all referenced files are correctly loaded.

About the author

Wei Zhang

Wei Zhang

Wei Zhang is a renowned figure in the CAD (Computer-Aided Design) industry in Canada, with over 30 years of experience spanning his native China and Canada. As the founder of a CAD training center, Wei has been instrumental in shaping the skills of hundreds of technicians and engineers in technical drawing and CAD software applications. He is a certified developer with Autodesk, demonstrating his deep expertise and commitment to staying at the forefront of CAD technology. Wei’s passion for education and technology has not only made him a respected educator but also a key player in advancing CAD methodologies in various engineering sectors. His contributions have significantly impacted the way CAD is taught and applied in the professional world, bridging the gap between traditional drafting techniques and modern digital solutions.

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