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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    9353×  
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applies to: AutoCAD ·

See also:
Tip 11924:Simple navigation - switching 3D views with your numpad.
Tip 11914:Maze generator for AutoCAD.
Tip 11888:Dynamic label of area and perimeter - DynArea.
Tip 11847:Automatic UCS aligned with the current View (UCSauto switch).
Tip 11780:How to rename layouts by a specific attribute of the title block?


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