AutoCAD

How To Use Lsp File In AutoCAD?

by Wei Zhang
4 min read

Understanding LSP Files in AutoCAD

LSP files are crucial for users looking to enhance their productivity in AutoCAD. These files consist of plain text programming instructions that the AutoCAD Lisp interpreter can execute. LSP, short for AutoLISP, allows users to automate tasks and streamline their workflows within AutoCAD.

How to Open an LSP File in AutoCAD

To utilize an LSP file in AutoCAD, follow these detailed steps:

  1. Access the Customization User Interface (CUI): Type CUI in the AutoCAD command line and press Enter. This action opens the Customization window, where you can manage various customization options.

  2. Select the Appropriate CUI File: In the CUI window, navigate to acad.cuix if you’re using the default settings or choose your custom CUI file if you have created one.

  3. Locate LISP Files Category: In the left pane, find the section labeled “LISP Files.” Right-click on it to open a context menu.

  4. Load the LISP File: From the context menu, select “Load LISP.” A file browser will appear, allowing you to navigate to the location where your LSP file is stored.

  5. Choose Your LISP File: Once you find your file, click on it to select it, then click the “Open” button.

  6. Finalize Changes: Return to the CUI window and click “Apply” followed by “Close” to exit. Your LSP file is now loaded into AutoCAD and ready for use.

Creating an LSP File in AutoCAD

Creating a new LSP file in AutoCAD can be accomplished simply by following these steps:

  1. Open CUI Command: Start by typing CUI in the command input area to open the Customization User Interface.

  2. Find LISP Files Category: In the left sidebar, locate the “LISP Files” section under the Customization tab.

  3. Add a New LISP File: Right-click on “LISP Files” and select “Load Lisp” from the context menu. This will allow you to browse for the LSP file you wish to create or import.

  4. Navigating the File System: Browse to the desired location of your new LSP file. Upon selecting it, it should be available in the list within the CUI.

  5. Applying Changes: Click on “Apply” to save your new settings, and exit the CUI by selecting “Close.”

Locating Acad.lsp

Finding your acad.lsp file is essential for configuring AutoCAD. The path to this file may vary based on your installation:

  1. Use Support Path Settings: Open AutoCAD and navigate to Options in the application menu (or type OPTIONS in the command line).

  2. Access the Files Tab: Go to the Files tab where you can manage support file search paths.

  3. Check Support File Search Path: Here, you will see all the directories AutoCAD searches for LSP files. Save your acad.lsp or acaddoc.lsp files in one of these directories to ensure they load successfully upon starting AutoCAD.

Using AppLoad to Load LSP Files

To load LISP files effectively, the AppLoad command is your go-to tool. Follow these steps:

  1. Activate AppLoad Command: Type APPLOAD in the command line and press Enter.

  2. Choose the LISP File: In the AppLoad dialog, browse to the location of your desired LSP file.

  3. Load the LISP File: Select your file, and click “Load.”

  4. Closing the Dialog: Click “Close” once the LISP file has been successfully loaded.

Editing an LSP File

To make modifications to an existing LSP file:

  1. Create a New Text Document: Right-click in your file explorer and select New > Text Document.

  2. Rename the File: Rename this document to acad.lsp. Ensure that the extension is appropriately changed to .lsp.

  3. Open for Editing: Double-click on the newly created LSP file to open it in a text editor like Notepad.

  4. Edit the File: Make your necessary changes to the programming code within the editor.

FAQ

1. What kind of tasks can I automate using LSP files in AutoCAD?
LSP files can automate repetitive tasks, such as drawing commands, dimensioning, and custom object creation, streamlining workflows and increasing productivity.

2. Are LSP files compatible with all versions of AutoCAD?
While LSP files are generally compatible across various versions, it’s advisable to verify compatibility for specific commands and features in AutoCAD 2025.

3. How do I troubleshoot issues when loading an LSP file?
If an LSP file fails to load, check the file path, ensure it’s properly placed in the support path, and confirm that there are no syntax errors within the LISP code itself.

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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