Re: QueryInterface failure.

"Alexander Nickolov" <>
Tue, 18 Jul 2006 09:46:17 -0700
1) Assuming these are all Automation-compatible interfaces,
that's indeed what you need to do.

2) Not sure what you mean by a DLL desribing all interfaces.
The type library serves that role, but you can certainly bundle
it within a self-registering resource DLL which would kind of
fit what you describe (at least semantically if not syntactically).
It's a variation on 1).

Type libraries are registered via regtlib.exe. Or programmatically
via LoadRegTypeLib().

Not sure what you mean by a registration ref count issue. I'm
not aware of any reference counting during registration...

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Angela Yan" <> wrote in message


So am I correct to say that there are 2 methods to deal with the problem:

1. Compile the common IDL file that containing all the shared interfaces
into a typlib. Then all the projects import the IDL file and the typlib in
their respective 'main' IDL files. During deployment, it needs to register
the common typlib (hmm.. how to register??) and take care of the
registration refCount issue.

2. Compile a DLL project that describes all the shared interfaces. Then
all the projects can use wizard "implement interface" to point to that DLL
project and implement the respective interfaces. The imported DLL project
path will be auto added into stdafx.h. In this case, does it need to take
care refCount issue for the common DLL during deployment??

Thank you very much.


"Alexander Nickolov" <> wrote in message

That question really has nothing to do with the original thread.
You'll probably want to group all shared interfaces as a separate
project that only produces a proxy/stub DLL (or a type library,
whatever is appropriate). Then in the other projects you only
refer to those interfaces, but do not generate any marshaling info
for them. That means you import the shared IDL and importlib()
the shared type library.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Angela Yan" <> wrote in message

Hi All,

I am something very similar now. But my question is: what if I have 2
local servers which implement the same interface, should I regsvr one or
both local server's proxy/stub? Or, should I compile the common IDL file
into a common typelib and regsvr it? Or is there any other


"Dinesh Venugopalan" <> wrote
in message

Hi All,

Thanks for the help. I created and registered the proxy dll. Now The
code is
working like charm. I am sorry for the late post here.

Dinesh Venugopalan

"Alexander Nickolov" wrote:

No. You have to build and register the proxy stub DLL yourself.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Dinesh Venugopalan" <> wrote in message


I am using VC8. As rightly pointed out I dont see any .mk file. If
part of the solution then wont this proxy/stub get compiled and
when I compile my Exe? I have a feeling that something may be wrong
way I declared my Interface in the .h file or the way I am adding it
the exe class.

Thanks in advance for the help.

"Alexander Nickolov" <> wrote in message

In VC 7.0 and later the ATL appwizard creates a proxy/stub DLL
project in the solution instead.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Sandy" <> wrote in message

Probably you have not registered the proxy/stub dll for the
which is required for cross-apartment marshalling.

This would not have been an issue when your object was in a dll
then the object would have been created in the same apartment as
client's, hence no marshalling dll required.
With out-of-process object, the marshalling dll is required.

If you used the VC wizard to build your COM dll/exe, then it may
created the make file (something like to generate the
stub dll for your interface. Just build this make file and
register the
dll using regsvr32. That should do.


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