Constructing a Variant From a List of Points
So far, the data in the polypoints variable is in a list format suitable for many
AutoLISP calls. However, the data is to be supplied as an input parameter to an ActiveX
call that expects a variant array of doubles. You can use another utility function
to make the required conversion from list to variant:
(defun gp:list-variantArray (ptsList / arraySpace sArray) ; allocate space for an array of 2d points stored as doubles (setq arraySpace (vlax-make-safearray vlax-vbdouble ; element type (cons 0 (- (length ptsList) 1) ) ; array dimension ) ) (setq sArray (vlax-safearray-fill arraySpace ptsList)) ; return array variant (vlax-make-variant sArray) )
The following actions take place in gp:list-variantArray:
- The vlax-make-safearray function is called to allocate an array of doubles (vlax-vbdouble). The vlax-make-safearray function also requires you to specify the lower and upper index boundaries of the
array. In gp:list-variantArray, the call to vlax-make-safearray specifies a start index of 0 and sets the upper limit to one less than the number
of elements passed to it (ptsList).
- The vlax-safearray-fill function is called to populate the array with the elements in the point list.
- The vlax-make-variant is called to convert the safearray into a variant. As the last function call in gp:list-variantArray, the return value is passed to the calling function.
The following is an example of a function call that invokes gp:list-variantArray to convert a list to a variant array of doubles:
; data conversion from list to variant (setq VLADataPts (gp:list-variantArray polypoints))
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