CAD tip # 14007:

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Workaround for the missing (vlax-create-object) in AutoCAD LT (voice, clipboard, etc.)

One of the limitations of the AutoLISP support in AutoCAD LT (2024 and higher) is the missing function which allows creating external objects - (vlax-create-object) (does not work and always returns nil in LT).

For some add-on applications you can circumvent this limitation by invoking the object creation function through the Windows interpreter for Microsoft HTML Applications - MSHTA.

This is e.g. a LISP code which invokes voice output from AutoCAD LT:

(setq sptext "Hello world") (startapp (strcat "mshta.exe vbscript:close(CreateObject(\"Sapi.SpVoice\").Speak(\"" sptext "\",0))"))

Or better yet - this code copies the given, e.g. generated/computed text to Windows Clipboard in AutoCAD LT:

(setq cltext "Hello world!") (startapp (strcat "mshta.exe vbscript:close(CreateObject(\"WScript.Shell\").Exec(\"clip\").stdIn.WriteLine(\"" cltext "\"))"))

More info - see Speak for AutoCAD.

ACLT2025ACLT2024

*CAD

26.1.2024 43026× FAQ Expert

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applies to: AutoCAD LT 2025 · AutoCAD LT 2024 ·

See also:
Tip 14402:	What is the difference between the BLOCKREPLACE, BREPLACE, REPLACEBLOCK, RIBLOCK and BLKREDEF commands?
Tip 14399:	How can I find out which version of LISP freeware is loaded?
Tip 14316:	How to redefine the HATCH command to start with the settings option?
Tip 14300:	How to convert my DWG drawing to a hand-drawn, sketched appearance even in AutoCAD LT?
Tip 14085:	JavaScript API support in AutoCAD and AutoCAD LT.

Selected tip: Changing the order of subassembly input parameters in Subassembly Composer.

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