Valued Contributor
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Registered: ‎07-14-2010
Post 1 of 4

What is the difference between .Net created and Interop object created layer?

395 Views, 3 Replies
01-10-2013 06:28 AM

Hi Guys,


I have used VB.net created a layer. then place a polyline on this layer. Then I use Teigh object export the drawing to bmp

oHost =

New TeighaX.OdaHostApp 'Create the DDX application

oBmp =

New TeighaX.OdaBmpOut 'Create the bmp-exporter'Variable stores a reference to the current drawing

oDoc = oHost.Application.Documents.Open(strDrawingPath)

'Open a drawing from the specified dwg-file

oBmp.WriteFile(oDoc.Database, strThumbBMPPath)


This throw an error.


However if I use COM Interop Object create a layer. place the same polyline on it. Then use the same code to export drawing to bmp. There is no error.


I think there must be different between .Net created layer to COM Interop created layer. Could anybody give me a hint? This drive me mad now.


here are code


    Public Function AutoCADCreateLayer(ByVal strLayerName As String, Optional ByVal lngLayerColour As Long = -1, _
                                       Optional ByVal blnLayerOn As Boolean = True, Optional ByVal blnLayerLocked As Boolean = False) As Boolean
        Dim db As Database = acApp.DocumentManager.MdiActiveDocument.Database

        Dim blnRt As Boolean
            Using lock As DocumentLock = Application.DocumentManager.MdiActiveDocument.LockDocument
                Using trans As Transaction = db.TransactionManager.StartTransaction
                    Dim objLayertb As LayerTable = db.LayerTableId.GetObject(OpenMode.ForWrite)
                    Dim objNewLayer As New LayerTableRecord
                    With objNewLayer
                        .Name = strLayerName
                        .Color = Autodesk.AutoCAD.Colors.Color.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.ByLayer, lngLayerColour)
                        '    .IsHidden = Not blnLayerOn
                        '   .IsLocked = blnLayerLocked
                    End With
                    Dim objNewLayerID As ObjectId = objLayertb.Add(objNewLayer)
                    trans.AddNewlyCreatedDBObject(objNewLayer, True)
                    db.Clayer = objNewLayerID
                End Using

                blnRt = True
            End Using
        Catch ex As Exception
            acApp.ShowAlertDialog("Error in create layer: " & ex.Message)

            blnRt = False
        Catch ex As SystemException
            acApp.ShowAlertDialog("Erro in create layer: " & ex.Message)

            blnRt = False

        End Try
        Return blnRt
    End Function

 COM Interop

Dim objCOMDrawing As Autodesk.AutoCAD.Interop.AcadDocument = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.AcadDocument



Thanks very much

*Expert Elite*
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Registered: ‎10-08-2008
Post 2 of 4

Re: What is the difference between .Net created and Interop object created layer

01-10-2013 11:07 AM in reply to: yaqiz

If you're adding layer in the current document

me think you need to remove" using LockDocument.. " code block from there,

just a guess, sorry

Valued Mentor
370 Posts
175 Kudos
Registered: ‎05-06-2012
Post 3 of 4

Re: What is the difference between .Net created and Interop object created layer

01-11-2013 06:42 AM in reply to: yaqiz

Are you sure you're asking your question in the right place ?


There's plenty of implementation differences between AutoCAD and other look-a-like APIs, and I don't know if this is the best place to ask about them.


Distinguished Mentor
607 Posts
37 Kudos
Registered: ‎03-18-2008
Post 4 of 4

Re: What is the difference between .Net created and Interop object created layer

01-11-2013 11:43 AM in reply to: DiningPhilosopher

What type of error is shown? If it is in one of your catch statements what does ex.message say?

Mike Robertson
FL. Dept. of Transportation
CADD Applications Developer
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