How to Add Lisp Command in AutoCAD?

Understanding AutoLISP in AutoCAD

AutoLISP is a specialized programming language derived from Lisp, designed specifically for the AutoCAD environment. This language enhances AutoCAD’s capabilities, allowing users to automate repetitive tasks, create custom commands, and improve overall workflow efficiency.

Steps to Add AutoLISP Commands in AutoCAD

To effectively integrate AutoLISP commands into your AutoCAD experience, follow these detailed procedures:

Loading a LISP File in AutoCAD

1. Download the LISP File: Obtain the desired LISP file from a trusted source. Ensure it ends with a .lsp extension.

2. Open AutoCAD: Launch the AutoCAD application on your computer.

3. Access the APPLOAD Command: At the command line, type APPLOAD and press the key. This opens the Load Application dialog box.

4. Select the LISP File: In the dialog box, navigate to the location where the .lsp file is saved. Click on the file to select it.

5. Load the File: Click the "Load" button. If successful, you should see a message confirming that the file has been loaded.

6. Close the Dialog: Click "Close" to exit the Load Application dialog box. Your LISP commands are now ready to use in the current AutoCAD session.

Automatically Load a LISP File at Startup

1. Open the APPLOAD Command: Begin by typing APPLOAD in the command line again.

2. Access Startup Suite: In the Load Application window, locate the "Startup Suite" section and click the "Contents" button.

3. Add LISP File: Press the "Add" button. Browse to select the LISP file you wish to load at startup and click "Open."

4. Finalize the Addition: Once the LISP file is added to your Startup Suite, click "Close" to exit the dialog. The file will now automatically load each time you start AutoCAD.

Enabling LISP through the CUI Editor

1. Run the CUI Command: Type CUI in the command line and hit .

2. Select Your CUI File: Find and select the ‘acad.cuix’ or your custom CUI file from the list.

3. Load the LISP File: Right-click on ‘LISP Files’ in the CUI editor and select "Load LISP" from the context menu.

4. Browse to the LISP File: Navigate to where the file is saved, select it, and confirm by clicking "Apply" and then "Close" to finish.

Verifying Loaded Commands

To check if your AutoLISP commands were loaded successfully, simply type the name of any AutoLISP command you’ve added at the command line and press . If functioning correctly, the command should execute.

Frequently Asked Questions

1. Can I use AutoLISP in AutoCAD LT?
No, AutoCAD LT does not support the use of AutoLISP. The APPLOAD command is also unavailable in this version, limiting automation features compared to the full version.

2. How can I create my own LISP commands?
To create a LISP command, write your code using a text editor, save it with a .lsp extension, and then load it into AutoCAD as described above. Experiment with simple functions to gradually enhance your skill.

3. Is there a way to troubleshoot an AutoLISP command that is not working?
Yes, check the command syntax and ensure that any required files are correctly referenced. Use the command line to view error messages that may provide clues about what isn’t functioning correctly.