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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    10520×  
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applies to: AutoCAD ·

See also:
Tip 12724:Rhomboid - how to draw parallelograms in AutoCAD?
Tip 12721:Animation of 3D milling along a path in AutoCAD.
Tip 12685:ReLinkField - re-link fields to source objects.
Tip 12616:Att2elev - move block to elevation specified by its attribute.
Tip 12546:How to renumber handles of selected DWG entities?


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