Re: Want COM to use a running DLL, not load it again

"Igor Tandetnik" <>
Wed, 6 Jun 2007 00:51:28 -0400
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message

My COM object is defined and registered by a DLL. The DLL is loaded
by a running exe. (They're eventually going to be an always-running
When I attempt to CoCreateInstance from an external process I want it
to create the object in the running exe process. But it is loading a
new instance of the DLL into my process and creating the object there.

It looks like the CLSCTX_LOCAL_SERVER flag is sort of what I need, but
the docs say it is for an exe server. What I have is an exe process
(currently with no COM) that has loaded a DLL server that does support
COM. Is there some way I can get more control of where COM creates
the object?

Try calling CoRegisterClassObject from the process that first loaded the
DLL. After that, CoCreateInstance(CLSCTX_LOCAL_SERVER) from another
process should work.

I can't help but wonder - why don't you just implement the object in an
out-of-proc (EXE) server in the first place? What's the point of having
a DLL if you don't want it loaded by clients?
With best wishes,
    Igor Tandetnik

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