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Editorial Team
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Asked: 2026-05-28T22:53:21+00:00

I create a C# COM interop for c++ to invoke. I have registered the

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I create a C# COM interop for c++ to invoke.
I have registered the dll and tlb file by regasm.
everything goes well till one day i changed code of C# part (i didn’t change the definition of interface, just implementation changed). one interface in COM returns an error 0x80131509. the strange thing is, it is only happened in some computers (my develop PC is works well so i can’t debug this problem).
I’m not really clear on how the C# COM worked with C++, after i registered them, i just know they create key value in window registry.(like what regasm /regfile generated). how c++ knows where the COM dll is(search path environment variables)? and what the use of tlb file in run time?

any suggestion?

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1 Answer

  1. Editorial Team

    I think that your problem is related to the registry… You should try to unregister and register (using regasm) your dll in the computers that are having this problem.

    If that doesn’t work unregister the dll in those computers, than use regedit to search and delete any missing registry keys that refer to it, after that register your dll again. You could also use one of those registry cleaner programs after deleting the missing keys to guarantee that you didn’t miss anything.

    Remember that you should allways register a dll in the directory that it will be used by your application and this should happen only once. If you need to unregister a dll, then you should allways do it in the same directory that you used for the registration. In other words, once a dll is registered do not move it.

    Note: if your dll is not on the same path as your C++ application it should be in a directory that is referenced in the PATH environment variable.

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