Topic: Using COM API in a .Net program for AutoCAD 2013 - Solved

[cannorth]

Hello,

  I have a .Net program that's written in COM.  I'm trying to get it to work in AutoCAD 2013 but I get a COM error.  I changed my

Code: [Select]

ThisDrawing.GetObject
to version 19.  When I run the following code afterwards

Code: [Select]

Dim returnObj As AcadObject

ThisDrawing.ActiveDocument.Utility.GetEntity(returnObj, picked_pt, "Select the wellsite's closed polyline...")
I get the following COM error:

Unable to cast COM object of type 'System.__ComObject' to interface type 'Autodesk.AutoCAD.Interop.Common.AcadObject'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{425F38BA-456A-4937-8825-BEA06D12DAA2}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

  How can I fix my problem?

Thanks,

cannorth

[Andrey Bushman]

I have a .Net program that's written in COM.

Is it possible?

[cannorth]

I think it's possible because COM worked in AutoCAD 2012.

cannorth

[Andrey Bushman]

I have a .Net program that's written in COM.
...
I think it's possible because COM worked in AutoCAD 2012.

Maybe I incorrect understand you, but it is impossible (as far as I know) - to write .Net program through COM. May be you meaned a "run", instead  a "write"?

[cannorth]

Yes, I'm trying to run a .Net program with COM code in it and it's not working.

cannorth

[cannorth]

What I mean by COM is the AutoCAD 2013 COM Type Library.

[HYPERPICS]

Which COM library are you referencing and are you building the appropriate release?  You must target either 32-bit or 64-bit when using the COM library as it is platform specific.

There should be no problem using the COM library with AutoCAD 2013.

[cannorth]

64 bit

[cannorth]

I solved my problem.  It was a reference issue.  The Autodesk.AutoCAD.Interop.Common.dll needs to be removed from the solution to get COM functions to work.

cannorth