Re: E_NOINTERFACE error in ATL server extension dll

"Alexander Nickolov" <>
Sun, 30 Sep 2007 13:23:04 -0700
The problem is in your calls to CoInitializeEx and CoUninitialize.
Lose them (move them to the beginning and end of your thread
respectively) and you should be fine.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"rtischer" <> wrote in message

I am getting this error when calling GetInterfaceFromGlobal in an
extension dll in my ATL server. My calling code looks like this:

CComPtr< IMyCallback > myCallback;
HRESULT result = globalInterfaceTable-

GetInterfaceFromGlobal( gitCookie,

 IID_IAtlMyCallback, ( VOID ** )&myCallback );

I know the code is good because I can put it directly in a spawned
worker thread and the GIT call returns S_OK. Also, since my
application code is well tested, I know the problem is not in the
thread switching or the extension dll loading or execution. This means
that either ATL GIT marshalling has a problem with PostThreadMessage
or extension dlls.

To test this out, I put the above code directly into the
PostThreadMessage handler and it too worked fine returning an S_OK.
But going one step further and calling a function in the extension dll
from the message handler, and the code fails returning E_NOINTERFACE.

Is there some peculiarity with marshalling that I don't know? I am
using the STA threading model. I'm an old hand at MFC and threads, but
am relatively new concerning ATL's need for marshalling across threads
in an ATL Server.

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