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I have a very simple DLL which exposes a COM object SimpleATLComLib.SimpleCom.

I have correctly registered it in the registry and I succeeded to use it both in a C# project (I successfully added the reference to SimpleATLComLib) and in VBA, but I can't get it to work in python.

In C# I simply added the reference and wrote

using namespace SimpleATLComLib

in VBA 

Dim x as SimpleATLComLib.SimpleCom

I tried to load it in python by using win32com.client

win32com.client.Dispatch("SimpleATLComLib.SimpleCom")

but I'm getting the following error

com_error: (-2147221005, 'Invalid class string', None, None)

How am I supposed to call it?

Vittorio Apicella
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  • Does 32-bit/64-bit mode match between them? Please refer to this article. [VBS: how to check presence of a registry key in x64.](https://social.msdn.microsoft.com/Forums/en-US/9b772e43-b875-40fa-b8cf-7740546e5a3b/vbs-how-to-check-presence-of-a-registry-key-in-x64?forum=isvvba), [Can I use 32bit dll or exe in 64bit python?](https://stackoverflow.com/q/11642134/9014308). – kunif Sep 22 '18 at 02:56
  • the whole chain is x64 – Vittorio Apicella Sep 22 '18 at 09:40

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