>-----Original Message-----
> have a C++ application that declares an Automation
method
>using the following signature:
>
>DISP_FUNCTION(apauto, "DMIToSectionComponent",
>DMIToSectionComponent, VT_BOOL, VTS_I4 VTS_UNKNOWN)
>
>I would assume that I can use the following method
>signature to pass an object into my C++ code
>
>[DispId(228)] bool DMIToSectionComponent( int handle,
>[MarshalAs(UnmanagedType.IUnknown)] object test );
>
>But everytime I call this code, I get a Type Mismatch
>error at Run Time.
>
>I am calling the code along the following lines
>
>object testObj = null;
>iApolloAuto.DMIToSectionComponent( m_sectionID, testObj );
>
>I have set a breakpoint in the C++ code inside the
>DMIToSectionComponent.
>
>In the same code base, I have been able to successfully
>call other VTS_UNKNOWN params using the
>UnmanageType.IUnknown syntax
>
>I would appreciate any suggestions about next steps.
>
>In particular, I am interested in how I can learn more
>about the RCW type checking as it pertains to these types
>of calls.
> I am interested in learning about the different ways
that
>I can Marshall IUnknowns in order to
>get more consistent results.
>
>
>.