why LWPOLYLINE's ObjectName is AcDbPolyline?

Hi:
this is really confused me:
Dim obj1 As AcadObject
Dim pt1
ThisDrawing.Utility.GetEntity obj1, pt1

MsgBox obj1.ObjectName

When I pick a LWPOYLINE, it show up as AcDbPolyline. Why not AcDbLWPolyline? does a system variable affect it? a bug? I really appreaciate any one could point out the reason.


Thanks
Wes

 

don't know if it's a bug but it does seem wrong.
this is another reason not to test on objectname property(per posts by TT
and others in past)

If TypeOf obj1 Is AcadLWPolyline Then
MsgBox "Lightweight"
Else
MsgBox "Regular"
End if

AcDbLWPolyline? does a system variable affect it? a bug? I really
appreaciate any one could point out the reason.

 

It may be because the LWPolyline is derived from the Polyline (base
class) but I am just guessing.

 

Lightweight polylines are AcDbPolyline and the old style polylines are AcDb2dPolyline. I'm not sure about the reasoning behind this standard, but I don't think it's a bug.

 

right you are, but the inconsistency between object type and object name, if
not a bug, is at least confusing programming style
~

Dim pl As AcadEntity
Dim vpt
ThisDrawing.Utility.GetEntity pl, vpt, "Pick"

Select Case True
Case TypeOf pl Is AcadLWPolyline
MsgBox "Lightweight: " & pl.ObjectName
Case TypeOf pl Is AcadPolyline
MsgBox "Heavy weight 2d: " & pl.ObjectName
Case TypeOf pl Is Acad3DPolyline
MsgBox "Heavy weight 3d: " & pl.ObjectName
Case Else
MsgBox "Something else: " & pl.ObjectName
End Select

AcDb2dPolyline. I'm not sure about the reasoning behind this standard, but
I don't think it's a bug.

 

You seem to be confused by more than just the programming style. What's with the face?