GetObject is not working in 2025 Beta Version

[serpetfree]

Hi,

I need some help.

I've downloaded Civil 3D Vail (2025 Beta version). I've created a simple .NET 8.0 Plugin for AutoCAD 2025. (ClassLibrary)

Here my code:

     <Autodesk.AutoCAD.Runtime.CommandMethod("Testgetobject")>

     Public Sub Testgetobject()

          Dim acAppComObj As Autodesk.AutoCAD.Interop.AcadApplication

          Dim strProgId As String = "AutoCAD.Application.25"

          acAppComObj = GetObject(, strProgId)

                  If acAppComObj Is Nothing Then

                                     MsgBox("acAppComObj is Nothing")

                   else

                                      MsgBox(acAppComObj.ActiveDocument.Name)

                   End if

     End Sub

    acAppComObj is Nothing, GetObject is not working

    Can anyone help? Why is it not working?

    Thanks.

[Alfred.NESWADBA]

Hi,

should be placed as feedback in the beta-forum.

- alfred -

[ntclmain]

Now AutoCAD 2025 is released, I think the topic can be opened again.

*

I got the same error with .Net 8, AutoCAD 2025:

     Interaction.GetObject(, "Excel.Application")

return Nothing 

As describe here for .Net 8,  

https://learn.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.interaction.getobject?view=net-8....

Interaction.GetObject(, "Excel.Application") should return an opening Excel instance (if any). In fact, it returns Nothing in all cases.

Are there anyone got the same error?

[saviour_merlin]

We have been using following strings in Autocad 2024 successfully.string progID = "AutoCAD.Application.24.
AcadApplication = (AcadApplication)Marshal.GetActiveObject(progID);
We have downloaded Autocad Architectural 2025 trial version. GetActiveObject is not working it is throwing an Exception.
If I use string progID = "AutoCAD.Application.25";
It throws the exception as
Unable to cast COM object of type 'System.__ComObject' to interface type 'AutoCAD.AcadApplication'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{52EE1CD2-A793-4DEC-9DF9-71CE75881F05}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).Please enable GetActiveObject string for 2025.

[_gile]

Hi,

Marshal.GetActiveobject is only available with .NET Framework (see the bottom of this page).

[saviour_merlin]

Yes u r right. While I am using my WCF Service it is not working in Autocad 2025. Still Autocad 2024 it was working fine. In Autocad 2025 it is not recognizing the string.

string progID = "AutoCAD.Application.24."
AcadApplication = (AcadApplication)Marshal.GetActiveObject(progID); It throws exception as string

not available

[daniel_cadext]

Just an FYI, progID   'AutoCAD.Application.25' works from python, so its probably something wrong with .NET or your installation

def PyRxCmd_doit():
    try:
        axApp = Ax.getApp()
        print(axApp.FullName)
    except Exception as err:
        traceback.print_exception(err)

#result      
#C:\Program Files\Autodesk\AutoCAD 2025\acad.exe
        
##wrappers
#
# def getApp() -> IAcadApplication:
#     id = AcadApplication.CLSID
#     return win32com.client.GetActiveObject(id)
   
# # This CoClass is known by the name 'AutoCAD.Application.25'
# class AcadApplication(CoClassBaseClass): # A CoClass
#     # An instance of the AutoCAD application
#     CLSID = IID('{363E5B47-885D-44C3-89EB-A2AB2129B57E}')
#     coclass_sources = [
#         _DAcadApplicationEvents,
#     ]
#     default_source = _DAcadApplicationEvents
#     coclass_interfaces = [
#         IAcadApplication,
#     ]
#     default_interface = IAcadApplication 
    

[_gile]

It seems possible to P/Invoke GetActiveObject, see this topic.