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Reading/writing to .dwg files without AutoCAD?

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Message 1 of 4
murrdpirate
3704 Views, 3 Replies

Reading/writing to .dwg files without AutoCAD?

Is this possible?  I was trying to make a simple windows program that prompted the user to select a .dwg file and the program would list all the layers in a listbox.  But the Database.ReadDWGFile procedure doesn't appear to work outside of AutoCAD (FileNotFound Exception).  Can I have my windows program open AutoCAD in the background to achieve this?

 

Here's my code:

 

 

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.EditorInput

Public Class Form1
    Dim myLayers As ArrayList

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myDB As New Database(False, True)
        myDB.ReadDwgFile("C:\test.dwg", FileOpenMode.OpenForReadAndAllShare, True, "")

        Using myTrans As Transaction = myDB.TransactionManager.StartTransaction
            Dim myLayerTable As LayerTable = myDB.LayerTableId.GetObject(OpenMode.ForRead)
            Dim layerName As String = ""
            For Each myObjectID As ObjectId In myLayerTable
                Dim myLayer As LayerTableRecord = myObjectID.GetObject(OpenMode.ForRead)
                myLayers.Add(myLayer.Name)
            Next
            myTrans.Abort()
        End Using

        myDB.Dispose()
        For Each layerxx In myLayers
            ListBox1.Items.Add(layerxx)
        Next
    End Sub

End Class

 

 

3 REPLIES 3
Message 2 of 4

Is this possible?

No.

But the Database.ReadDWGFile procedure doesn't appear to work outside of AutoCAD

Yes.

You can only use ActiveX interface of AutoCAD from external application, e.g.

Autodesk.Autocad.Interop and

Autodesk.Autocad.Interop.Common

 
Message 3 of 4
arcticad
in reply to: AlexanderRivilis

You can use either AutoDesk  RealDWG

http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=770257

 

or Teigha™.NET for .dwg files

http://www.opendesign.com/

 

To modify files without Autocad.

 

These are both pay options.

 

The only free options is to have Autocad Installed and use ActiveX.

 

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Message 4 of 4
murrdpirate
in reply to: murrdpirate

Sweet.  Many thanks to both of you.

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