[求助]VBA如何计算曲线的长度
VBA如何计算曲线的长度！样条曲线没有长度返回的值，怎么办？？？？ 第一步：在VBAIDE里先定义 GetCurveLen宏Public Sub GetCurveLen()
'利用VLisp计算曲线长度
Dim LispPath As String
LispPath = "c:\Getlen.LSP" 'Lisp文件的路径
Dim tempS As String, tempR As Double
tempS = ThisDrawing.GetVariable("users5")
tempR = ThisDrawing.GetVariable("userr5")
Dim obj As AcadEntity, pt As Variant
ThisDrawing.Utility.GetEntity obj, pt, "选择对象:"
ThisDrawing.SetVariable "users5", obj.Handle'将对象的句柄放在系统变量里
ThisDrawing.SendCommand "(load " & Chr(34) & Replace(LispPath, "\", "/") & Chr(34) & ")" & vbCr
MsgBox "曲线长度为:" & CStr(ThisDrawing.GetVariable("userr5")) '到userr5里取值
ThisDrawing.SetVariable "users5", tempS '还原系统变量
ThisDrawing.SetVariable "userR5", tempR '还原系统变量
End Sub
第二步：复制下面代码存为*.lsp文件，注意文件名、路径要与上面的lisppath变量相一致
(defun GetLen( / obj len)
;;功能:计算曲线长度
(vl-load-com)
(setq obj (vlax-ename->vla-object (handent (getvar "users5"))));;把对对象的句柄放在users5
(setq len (vlax-curve-getDistAtParam obj (vlax-curve-getendParam obj)))
(setvar "userr5" len);;把对对象的长度放在userr5
)
(GetLen)
然后运行 GetCurveLen宏
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