Article ID: 197781 - View products that this article applies to.
This article was previously published under Q197781
This article has been archived. It is offered "as is" and will no longer be updated.
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:
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.
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.
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:
(https://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
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.