通过ActiveX构造LWPOLYLINE

XDSoft

Constructing vlisp lwpolyline via ActiveX


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:

1. (vl-load-com)
   
2. 
   
3. (defun T_LWPoly()
   
4. (setq acadapp (vlax-get-Acad-Object)
   
5.      acaddoc (vla-get-ActiveDocument acadapp)
   
6.      *ModelSpace*  (vla-get-ModelSpace acaddoc)
   
7. )
   
8. 
   
9. 
   
10. (setq pt1 (list 5.18379 1.76186))
    
11. (setq pt2 (list 1.39797 4.08785))
    
12. (setq pt3 (list 4.71491 7.61156))
    
13. (setq pt4 (list 8.63965 6.48328))
    
14. (setq pt5 (list 8.65702 3.49767))
    
15. (setq pt6 (list 5.46165 3.93163))
    
16. (setq pt7 (list 5.58321 5.73688))
    
17. (setq pt8 (list 5.23589 6.03197))
    
18. (setq pt9 (list 4.52388 4.9384))
    
19. (setq pt10 (list 4.73227 2.99429))
    
20. (setq pt11 (list 7.63242 1.90072))
    
21. (setq pt12 (list 7.25036 1.29318))
    
22. 
    
23. (setq Points (apply 'append (list pt1 pt2 pt3 pt4 pt5 pt6 pt7 pt8 pt9 pt10 pt11
    
24. pt12)))
    
25. (setq ptlstlen (length Points))
    
26. 
    
27. ; make array of 12*2=24 doubles - that's an array of dimension 0 to 23
    
28. (setq PointDataA (vlax-make-safearray vlax-vbDouble (cons 0 (1- ptlstlen))))
    
29. (vlax-safearray-fill PointDataA Points)
    
30. (setq PointData (vlax-make-variant PointDataA))
    
31. 
    
32. (setq myLWpoly (vla-addLightweightPolyline *ModelSpace* PointData))
    
33. 
    
34. (vla-Put-Color myLWpoly acBlue)
    
35. (princ)
    
36. )
    

(vl-load-com)<br /> <br /> (defun T_LWPoly()<br /> (setq acadapp (vlax-get-Acad-Object)<br />      acaddoc (vla-get-ActiveDocument acadapp)<br />      *ModelSpace*  (vla-get-ModelSpace acaddoc)<br /> )<br /> <br /> <br /> (setq pt1 (list 5.18379 1.76186))<br /> (setq pt2 (list 1.39797 4.08785))<br /> (setq pt3 (list 4.71491 7.61156))<br /> (setq pt4 (list 8.63965 6.48328))<br /> (setq pt5 (list 8.65702 3.49767))<br /> (setq pt6 (list 5.46165 3.93163))<br /> (setq pt7 (list 5.58321 5.73688))<br /> (setq pt8 (list 5.23589 6.03197))<br /> (setq pt9 (list 4.52388 4.9384))<br /> (setq pt10 (list 4.73227 2.99429))<br /> (setq pt11 (list 7.63242 1.90072))<br /> (setq pt12 (list 7.25036 1.29318))<br /> <br /> (setq Points (apply 'append (list pt1 pt2 pt3 pt4 pt5 pt6 pt7 pt8 pt9 pt10 pt11<br /> pt12)))<br /> (setq ptlstlen (length Points))<br /> <br /> ; make array of 12*2=24 doubles - that's an array of dimension 0 to 23<br /> (setq PointDataA (vlax-make-safearray vlax-vbDouble (cons 0 (1- ptlstlen))))<br /> (vlax-safearray-fill PointDataA Points)<br /> (setq PointData (vlax-make-variant PointDataA))<br /> <br /> (setq myLWpoly (vla-addLightweightPolyline *ModelSpace* PointData))<br /> <br /> (vla-Put-Color myLWpoly acBlue)<br /> (princ)<br /> )<br />

ilovem

谢谢楼主的分享

tigcat

谢谢楼主分享