Re: Want COM to use a running DLL, not load it again
Igor Tandetnik wrote:
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message
news:sLGdnb2VW4lNjPvbnZ2dnUVZ_vOlnZ2d@comcast.com
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
service.)
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?
Thanks (again!) Igor. The EXE is generic, and loads specifed DLLs
explicitly for different applications. I see that CoRegisterClassObject
does not pass the hInstance, so it seems like I can't call this from a
DLL running within the EXE process. Sound right?
--
Scott McPhillips [MVP VC++]
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