通过ActiveX创建LWPOLYLINE对象
问题：
Is the method of passing a list of points from ActiveX to addLWPolyline in
AutoCAD 2000 that same way as in AutoCAD R14 using Visual LISP?
The following error occurs when passing a list:
Error: lisp value has no coercion to VARIANT with this type:
(17509.1 11009.0 17484.1 11009.0 17484.1 11109.0 17509.1 11109.0)
解答：
The passing of lists to ActiveX methods has changed in AutoCAD 2000. You need to
use the vlax-make-safearray, vlax-safearray-fill, vlax-make-variant functions to
pass a list to ActiveX functions. The following code does this:
(vl-load-com)
(defun T_LWPoly ()
(setq acadapp (vlax-get-Acad-Object)
acaddoc (vla-get-ActiveDocument acadapp)
*ModelSpace* (vla-get-ModelSpace acaddoc)
)
(setq pt1 (list 5.18379 1.76186))
(setq pt2 (list 1.39797 4.08785))
(setq pt3 (list 4.71491 7.61156))
(setq pt4 (list 8.63965 6.48328))
(setq pt5 (list 8.65702 3.49767))
(setq pt6 (list 5.46165 3.93163))
(setq pt7 (list 5.58321 5.73688))
(setq pt8 (list 5.23589 6.03197))
(setq pt9 (list 4.52388 4.9384))
(setq pt10 (list 4.73227 2.99429))
(setq pt11 (list 7.63242 1.90072))
(setq pt12 (list 7.25036 1.29318))
(setq Points (apply 'append
(list pt1 pt2 pt3 pt4 pt5 pt6 pt7 pt8 pt9 pt10
pt11 pt12)
)
)
(setq ptlstlen (length Points))
; make array of 12*2=24 doubles - that's an array of dimension 0 to 23
(setq PointDataA
(vlax-make-safearray
vlax-vbDouble
(cons 0 (1- ptlstlen))
)
)
(vlax-safearray-fill PointDataA Points)
(setq PointData (vlax-make-variant PointDataA))
(setq myLWpoly (vla-addLightweightPolyline *ModelSpace* PointData))
(vla-Put-Color myLWpoly acBlue)
(princ)
)
额，原来lisp也能操作ActiveX
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