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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    8694×  
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applies to: AutoCAD ·

See also:
Tip 11511:Assigning elevations to 2D contours (isolines).
Tip 11505:Get name of the original Revit BIM model from DWG files in AutoCAD.
Tip 11502:How to detect DWG files created as an export from Autodesk Revit?
Tip 11492:Adding selected numbers in drawing texts - counting numbers (GrSelNum).
Tip 11409:Catalog of all available hatch patterns.


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