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Editorial Team
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Asked: 2026-05-20T04:37:19+00:00

Hello I created COM visible class MyClass on C# registered by regasm command –

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Hello
I created COM visible class MyClass on C#
registered by regasm command – registration passed OK
And I can see in registry progid corresponding to MyClass
In the client C++ code :
1) call of CLSIDFromProgID passed OK
2) call of CoCreateInstance fail with error “Class not registered” (80040154)
What can be possible reasons of such behavior – your help will be very valuable
Thanks in advance

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1 Answer

  1. Editorial Team

    I had the same issue, solved executing these commands from the console:

    C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\regasm dllname.dll /tlb:dllname.tlb
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\regasm dllname.dll /regfile

    then doing a double click on the reg file generated.

    to test if everything is ok you can have a very small vb script file which created the object, just put a command like this in a .vbs file:

    SET testObj = CreateObject(“Namespace.ClassName”)

    your COM visible assembly should be strongly named.

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