Article ID: 948479 - View products that this article applies to.
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Call CoCreateInstance (directly or indirectly) to create an instance of a COM object that is implemented in a module which was built with some Isolated COM settings in its manifest. There are several wrapper classes that could have been used to make the CoCreateInstance (or CoCreateInstanceEx) call indirectly, or you could have a call directly to that function.
The HRESULT return code may be 0x8007007b (ERROR_INVALID_NAME), if the COM sub-system was not able to load the DLL that implements the COM object.
In cases where the Registration-Free COM was not correctly completed, and the embedded manifest is not correct or complete, the LoadLibrary call may fail. Ole32 attempts to load the DLL as part of the process of creating the object, but an incorrect manifest may cause it to return STATUS_OBJECT_NAME_INVALID (0xc0000033). This error gets propagated back to the return from CoCreateInstance as ERROR_INVALID_NAME (0x8007007b). This may be misleading, since the path and filename of the DLL may be perfectly correct.
If the Registration-Free COM is desired, it should be implemented correctly. Here are some articles that may be helpful in correctly implementing this feature:
Registration-Free Activation of COM Components: A Walkthrough
How to: Configure .NET-Based Components for Registration-Free Activation
Escape DLL Hell: Simplify App Deployment with ClickOnce and Registration-Free COM -- MSDN Magazine, April 2005
If Reg-Free COM was not intended, there may be some properties unintentionally specified in the Isolated COM page of the Manifest Tool configuration properties for the project. The "Type Library File" (/tlb) and "Component File Name" (/dll) properties will result in <file>, <comClass>, <comInterfaceExternalProxyStub>, and such tags being added to the assembly manifest embedded in the DLL. Removing the unwanted properties and then rebuilding the project should resolve the issue.
Here are some other useful web logs on the subject:
Junfeng Zhang's Windows Programming Notes : Registration Free COM/.Net interop
Mikhail Arkhipov (MSFT)'s WebLog : Registration-free COM
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Article ID: 948479 - Last Review: January 29, 2008 - Revision: 1.3
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