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CAD tip CAD tip # 4170:

Question CAD 
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Q - question

What is the difference between the (command) and (vl-cmdf) LISP functions?

A - answer These AutoCAD-command-invoking functions are almost identical. The newer (vl-cmdf) VisualLISP function verifies the parameters passed to AutoCAD and invokes the command only if the arguments are valid.

Compare e.g.:

(setq p (getpoint))
(vl-cmdf "_ID" p)
(vl-cmdf "_ID" "dummy")
(command "_ID" "dummy")
(vl-cmdf) returns T if the command was invoked successfully (nil otherwise).
ACAD
100% *  CAD 
17.12.2004    8933×  
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applies to: AutoCAD ·

See also:
Tip 11714:How to assign a RAL color to a DWG object and get its ACI equivalent?
Tip 11693:Adding numbers in drawing texts.
Tip 11686:Where is stored the application list loaded through the Startup Suite?
Tip 11664:Which AutoCAD commands do exist also in the commandline (non-dialog) dashed version?
Tip 11654:Select 3D solids by their height, volume, surface (smaller then...)


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