Microsoft KB Archive/327094

= BUG: The UCOMIEnumVARIANT interface definitions for the Clone method and for the Next method are incorrect in the .NET Framework 1.1 and in the .NET Framework 1.0 =

Article ID: 327094

Article Last Modified on 9/13/2005

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APPLIES TO


 * Microsoft .NET Framework 1.1
 * Microsoft .NET Framework 1.0
 * Microsoft Visual Studio .NET 2003 Professional Edition
 * Microsoft Visual Studio .NET 2003 Enterprise Architect
 * Microsoft Visual Studio .NET 2003 Enterprise Developer
 * Microsoft Visual Studio .NET 2002 Professional Edition
 * Microsoft Visual Studio .NET 2002 Enterprise Architect
 * Microsoft Visual Studio .NET 2002 Enterprise Developer

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This article was previously published under Q327094





SYMPTOMS
The signatures for the unmanaged IEnumVARIANT::Next method and for the IEnumVARIANT::Clone method are the following. IEnumVARIANT::Next HRESULT Next(  unsigned long  celt,                VARIANT FAR*  rgVar,                unsigned long FAR*  pCeltFetched  );

IEnumVARIANT::Clone HRESULT Clone(  IEnumVARIANT FAR* FAR*  ppEnum  ); However, the UCOMIEnumVARIANT interface does not define these methods correctly. The following are the current incorrect signatures for these methods. UCOMIEnumVARIANT.Next int Next(  int celt,   int rgvar,   int pceltFetched );

UCOMIEnumVARIANT.Clone void Clone(  int ppenum ); Note In the UCOMIEnumVARIANT.Next method, the rgvar parameter is defined as an int instead of as an object. Additionally, in the UCOMIEnumVARIANT.Clone method, the ppenum parameter is defined as an int instead of as UCOMIEnumVARIANT. Therefore, it is difficult to use the UCOMIEnumVARIANT interface to enumerate a collection of variants.



WORKAROUND
You can write you own definition of the IEnumVARIANT interface. The following code is an example on how to do this. [ ComImport, Guid(&quot;00020404-0000-0000-C000-000000000046&quot;), InterfaceType(ComInterfaceType.InterfaceIsIUnknown) ] interface IEnumVARIANT {   [PreserveSig] int Next(       int celt,        out object rgVar,        out int pCeltFetched);

[PreserveSig] int Skip(       int celt);

[PreserveSig] uint Reset;

IEnumVARIANT Clone; }



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, visit the following Microsoft Developer Network (MSDN) Web sites:

IEnumVARIANT interface

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/automat/htm/chap5_6t2d.asp

UCOMIEnumVARIANT interface

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemRuntimeInteropServicesUCOMIEnumVARIANTClassTopic.asp

Keywords: kbtshoot kbbug kbprb kbvs2002sp1sweep KB327094

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