How to Load, Run & Auto-Start AutoLISP (.LSP, .VLX, .FAS) Scripts in GstarCAD & AutoCAD
Complete guide to loading AutoLISP routines via APPLOAD, configuring the Startup Suite for automatic loading, Trusted Locations security setup, and finding command names.
⚡ Quick Answer / Key Takeaway
Type APPLOAD (or AP), browse to your .lsp, .vlx, or .fas file, and click Load. To load the script automatically in every drawing session, click the 'Contents' button under Startup Suite and add the file there.
Step-by-Step Instructions & Commands
Step 1: Interactive Loading via APPLOAD (AP)
Type APPLOAD (shortcut AP) in the command line. Select your .lsp, .fas, or .vlx file and click Load. Check the command line history—most LISP scripts print a message such as 'Type XYZ to run' or define a function using (defun c:COMMANDNAME () ...).
Step 2: Configure the Startup Suite for Permanent Loading
Inside the APPLOAD dialog, locate the briefcase icon labeled Startup Suite and click Contents... → Add. Any LISP or .NET DLL added to the Startup Suite is automatically initialized whenever a new or existing drawing is opened.
Step 3: Add Corporate Script Folders to Trusted Locations
To suppress security confirmation popups every time a script loads, open OPTIONS → Files tab, add your script folder to both Support File Search Path and Trusted Locations (or adjust SECURELOAD / TRUSTEDPATHS).
Common Issues & Troubleshooting Guide
| Common Failure / Problem | Root Cause & Recommended Solution |
|---|---|
| Loaded the .lsp file but don't know the command to type | Open the .lsp file in Notepad or VS Code and search for '(defun c:'. The text immediately following 'c:' (before the space or parenthesis) is the exact command name to type in CAD. |
| Error: no function definition: VLAX-GET-ACAD-OBJECT | Add (vl-load-com) at the very top of your AutoLISP script to initialize the Visual LISP ActiveX/COM extension library. |
Cross-CAD Compatibility & Alternatives
GstarCAD 2027 executes standard AutoLISP, Visual LISP (vl-*, vlax-*, vlr-*), and compiled FAS/VLX modules with near-100% compatibility without recompilation.
Engineering Best Practices Checklist
- Localize all internal variables in your defun list (e.g., (defun c:MyTool (/ ent pt1))) to prevent global namespace pollution.
- Centralize team LISP scripts on a read-only network share mapped into Trusted Locations.
- Include an error handler to restore OSMODE and CLAYER if the user cancels the routine.
Related Concepts & Further Learning
Underlying Kernel Mechanics & Automated Prevention Protocol
To permanently prevent recurrence of How to Load, Run & Auto-Start AutoLISP (.LSP, .VLX, .FAS) Scripts in GstarCAD & AutoCAD across enterprise project directories, CAD managers must understand how the underlying DWG object database (AcDbDatabase / GcDbDatabase) and graphics display pipeline manage entity handles, symbol tables, and external dependencies:
| Diagnostic Command / Variable | Recommended Production Value | Engineering Function & Impact |
|---|---|---|
| AUDIT / RECOVERALL | Fix Errors = Yes (Y) |
Validates B-tree symbol tables, repairs orphaned dictionary handles, and heals nested Xrefs. |
| -PURGE → Regapps (R) | Verify Each = No (N) |
Strips thousands of unreferenced third-party Registered Application IDs that bloat DWG memory. |
| GRAPHICSCONFIG | Hardware Acceleration = ON | Verifies DirectX 11/12 or OpenGL GPU driver allocation and clears corrupted display cache buffers. |