VARIANT (automation type) in C#?

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Petar Popara - 08 Sep 2005 16:17 GMT

The ActiveX control takes this VARIANT as function argument:

[id(3), helpstring("method Init")] HRESULT Init([in] VARIANT a_properties);

I'm assigning it in C# as:

someCOM.Init("C:\\abc.xml");

but I got some exception on this line:

---------------------------
Microsoft Visual C++ Debug Library
---------------------------
Debug Error!
Program: ...ode Samples\Test.exe
abnormal program termination

(Press Retry to debug the application)
---------------------------
Abort Retry Ignore
---------------------------

What should I do? :(

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Petar Popara - 08 Sep 2005 16:20 GMT

P.S. Internally, ActiveX is expecting param to be of type BSTR (VT_BSTR).

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Egbert Nierop (MVP for IIS) - 09 Sep 2005 11:19 GMT

> The ActiveX control takes this VARIANT as function argument:
>
[quoted text clipped - 6 lines]
>
> but I got some exception on this line:

Your DllImport in C# should have the object as a parameter.
The object type is marhaled to a VARIANT automatically when going to
unmanaged code.

> ---------------------------
> Microsoft Visual C++ Debug Library
[quoted text clipped - 9 lines]
>
> What should I do? :(

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VARIANT (automation type) in C#?

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