How To Make Lisp Command In AutoCAD?

Understanding AutoLISP in AutoCAD

Creating and using LISP commands in AutoCAD can significantly enhance productivity by automating repetitive tasks. Here’s a detailed guide on how to create and use LISP commands effectively in AutoCAD 2025.

Creating a LISP Program

1. Open the Visual LISP Editor:

   • Navigate to the “Tools” menu in AutoCAD and select “AutoLISP.” Click on “Visual LISP Editor” to open the dedicated environment for scripting.

2. Start a New File:

   • In the Visual LISP Editor (VLISP), go to the “File” menu and choose “New” to create a new text document where you can write your LISP code.

3. Writing Your Code:

   • Type your LISP commands into the text editor. Basic LISP routines typically follow a parenthesis structure. For instance, (command "LINE") could initiate a line drawing command.
4. Saving the File:
   • After writing your script, save the file with a .lsp extension using “File > Save As.” This is essential for AutoCAD to recognize it as a LISP file during loading.

Loading the LISP Script in AutoCAD

1. Open the AppLoad Command:

   • Type APPLOAD directly into the AutoCAD command line or select Tools > Load Application from the menu.

2. Select Your LISP File:

   • In the Appload dialog that appears, navigate to your saved LISP file. Highlight it and click the “Load” button to load your routine into the current drawing session.
3. Close the Dialog:
   • After loading, you can close the Appload dialog. Your LISP commands are now ready for execution.

Executing LISP Commands

1. Use the Command Line:

   • Type the command name you defined in your LISP script directly into the AutoCAD command line, ensuring it is wrapped in parentheses, and press ‘Enter’ to execute.
2. Alternative via VLISP Console:
   • For testing or debugging, you can also enter your command in the Visual LISP Console window, again ensuring to use parentheses.

Understanding AutoLISP Functions

AutoLISP allows you to create custom routines that automate commands primarily used in AutoCAD. These functions help eliminate redundancy and improve production speed. A primary feature of AutoLISP is its capability to handle complex tasks that cannot be accomplished with built-in commands alone.

Managing LISP Files in AutoCAD

1. Startup Suite:

   • If you wish for your LISP commands to load automatically whenever you start AutoCAD, add them to the Startup Suite. Use the AppLoad command, and navigate to “Startup Suite” to manage your files.
2. Loading at Startup:
   • Click on the “Contents” button, then “Add” to select the LISP files you want in the suite. Click “Close” once you have added them.

Frequently Asked Questions

1. Can AutoCAD LT run LISP routines?

AutoCAD LT does not support AutoLISP commands, meaning you cannot use LISP scripting features in this version of AutoCAD.

2. What should I do if my LISP commands are not executing?

Ensure the LISP file is loaded correctly through the AppLoad command. Check for syntax errors in your code, and make sure you are using the correct command name.

3. What is the purpose of the acaddoc.lsp file?

The acaddoc.lsp file is intended for loading specific LISP commands that you want to be available every time you start a new or existing drawing. It acts as a library of routines that enhances your workflow in AutoCAD.