无法将com对象实例重新转换为com obj

Question

我正在尝试使用python和win32com自动化Microstation，但是在尝试重新发送通过COM接口创建的对象时遇到以下错误。有人能帮我排除故障吗？在

import win32com.client

MS = win32com.client.Dispatch("MicroStationDGN.Application")
MS.Visible = 1

DF = MS.OpenDesignFile("C:\\mydgn.dgn", False)
print(DF.Models.Count)

startPoint = MS.Point3dFromXYZ(2.0,2.0,0.0)
endPoint = MS.Point3dFromXYZ(4.0,4.0,0.0)

line = MS.CreateLineElement2(None, startPoint, endPoint)
print(line)
MS.ActiveModelReference.AddElement(line)
line.redraw()

在AddElement行中，我得到了以下错误：

^{pr2}$

但是打印给了我一个有效的com对象。。。在

(<win32com.gen_py.Bentley MicroStation DGN 8.9 Object
Library._LineElement instance at 0x119452224>, com_struct(X=2.0,
Y=2.0, Z=0.0), com_struct(X=4.0, Y=4.0, Z=0.0))

假设Microstation DGN Library作为参考模块加载，ExcelVBA中的等效项如下所示。在

Sub MSFromXlReference()

Dim MS As MicroStationDGN.Application
Dim DesignFile As DesignFile
Dim Line As LineElement
Dim startPoint As Point3d
Dim endPoint As Point3d

Set MS = New MicroStationDGN.Application
MS.Visible = 1

Set DesignFile = 
MS.OpenDesignFile("C:\\mydgn.dgn", False)

startPoint = MS.Point3dFromXYZ(2#, 2#, 0#)
endPoint = MS.Point3dFromXYZ(4#, 4#, 0#)

Set Line = MS.CreateLineElement2(Nothing, startPoint, endPoint)

MS.ActiveModelReference.AddElement Line
Line.redraw

End Sub