Re: Mixed Platform (C# C++) COMException 80040154 on Vista 64 SP1?

"Igor Tandetnik" <>
Tue, 16 Dec 2008 17:33:19 -0500
Ed Sutton <> wrote:

I've been banging my head on this for a week now. Everything worked
fine on Vista 32-bit. Yet no fun allowed under Vista SP1 64-bit.

I thought it was a x64, VC90 CRT issue, or a Vista SP1 issue. I think
now it is not a CRT issue though SP1 or 64-bit are still suspects.

* My ATL/COM component registers fine at the command line using
regsvr32. * My solution is configured for "Mixed Platforms".
* It is 90% C# except for one C++ ATL/COM component that interfaces to
the setupapi to enumerate and identify USB / serial ports.

My guess is, the C# application is built with "Any CPU" option (or
something like that, I don't remember exactly what it's called, but
there's a three-way setting for managed apps that could be set to 32bit,
64bit, or "match the OS you are running on"), while the C++ DLL is built
for 32bit. When running on 64-bit OS, your C# application becomes a
64-bit process which cannot possibly load a 32-bit DLL.
With best wishes,
    Igor Tandetnik

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