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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    8628×  
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applies to: AutoCAD ·

See also:
Tip 11409:Catalog of all available hatch patterns.
Tip 11354:Animate dyn.block parameters and dim.constraints in AutoCAD DWGs.
Tip 11295:Iterative Move, Scale and Rotate - till boundary touch.
Tip 11289:Adding, multiplying and rounding numbers inside DWG drawing texts.
Tip 11252:Applying STRETCH to 3D objects in AutoCAD.


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