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43

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1
+1  Q: 

E_NOINTERFACE returned

I have a COM Client and a COM Server, the COM Server holds an Interface exposed by the client, now the client is actually just an EXE, how do I make sure that the Interface exposed by the client is visible to the Server?

Because when I call CoCreateInstance now on that interface in the server I get a E_NOINTERFACE and I suspect it's because there is no Proxy/stub dll for the client registered on the system.

+1  A: 

Yes, E_NOINTERFACE can be returned if COM can't marshal the interface. You can use Process Monitor to try to find what exactly is happening.

sharptooth  2010-07-06 13:57:46
so I've checked the registry and the IID is present of the Interface, it however still returns the error, is there anything else I can do?
Tony  2010-07-06 14:32:04
In ProcMon the first time it queries the Key it says 'BUFFER TOO SMALL'
Tony  2010-07-06 14:34:27
Okay, IID is present, so what? What if COM tries to find proxy/stub and fails? You shouldn't expect that you just look onto Process Monitor output for a moment and immediately see what's wrong.
sharptooth  2010-07-07 05:36:17

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