Re: CoInitialize[Ex] somehow returns S_OK in constructor of COM object being created

"Igor Tandetnik" <>
Wed, 12 Dec 2007 08:27:05 -0500
"Dmitry Shandyba" <> wrote in message

I have a single-threaded ATL COM object (semantically a plugin) that
resides in the dll.
This object is loaded by main application framework during its
lifetime as a result of [Co]CreateInstance call from an STA thread.

Obviously there is no need to put CoIntialize[Ex] anywhere in my
object as the fact that object is created by itself means that COM
subsystem is already initialized by caller (owning) thread.

At the same time if I do (by chance) invoke CoIntialize[Ex] in, let's
say, main plugin object's constructor I receive... S_OK! Not S_FALSE

The only way I can think of this could happen is if the client doesn't
in fact use CoCreateInstance, but bypasses COM when creating your
object. E.g. it loads your DLL directly with LoadLibrary, finds
DllGetClassObject entry point, obtains the class factory and calls
IClassFactory::CreateInstance. None of this directly uses COM
infrastructure so COM has no chance to intervene and error out when it's
not initialized.
With best wishes,
    Igor Tandetnik

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