Convert C# object To VARIANT of type binary format( VT_UI1+VT_ARRAY)

[dileepsree]

My aim is :- Pass C# object as a parameter of unmanaged Dll(vc++ 6.0)

method . with in the unmaaged dll methedod construct similar C++ class instance .
vice versa from dll method argument VARIANT result has to be converted to C# object

For this , I tried
Marshal.GetNativeVariantForObject(s, p);
or
Marshal.StructureToPtr(segInfo, ptrValue, false);

and
Marshal.GetObjectForNativeVariant(res)



But I got the error as like
An invalid VARIANT was detected during a conversion from an unmanaged VARIANT to a managed object. Passing invalid VARIANTs to the CLR can cause unexpected exceptions, corruption or data loss.


Source Files are attached
TestOne.zip is the VC++(6.0) unmanaged dll
TestACallFromDll.zip is C# application

Let me help as early as possible ....

Thanks In advance .

Regards,
Dileep S