Microsoft KB Archive/197781

= CopyProxy Does Not Make a Copy for Dual Interfaces =

Article ID: 197781

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft BackOffice Server 4.0

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This article was previously published under Q197781



SYMPTOMS
If you call CoCopyProxy API on a proxy for a custom (automation) interface that is marshalled by the automation marshaller (Oleaut32.dll), the API will return the following error:

S_OK

However, no copy will be made.

If you build a proxy/stub .dll for the same interface and use it as the marshaller, the API CoCopyProxy works.



CAUSE
The old code had the assumption that CreateProxy returned a valid interface parameter, which is not TRUE for automation proxies. Automation proxies return the interface pointer only after the channel is connected.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Keywords: kbbug kbfix KB197781

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