> Hello, simple question (so to say).
>
> I ham trying to manage interoo for interface arrays.
>
> This interface definition is not working. It is for a DirectShow
> Interface:
>
> [ComVisible(true), ComImport,
> Guid("56a86892-0ad4-11ce-b03a-0020af0ba770"),
> InterfaceType( ComInterfaceType.InterfaceIsIUnknown )]
> public interface IEnumPins {
> [PreserveSig]
> int Next(
> [In] int cPins,
> [Out, MarshalAs(UnmanagedType.LPArray,
> SizeParamIndex=2)] out IPin[] ppPins,
> [Out] out int pcFetched );
>
> [PreserveSig]
> int Skip( [In] int cPins );
> void Reset();
> void Clone( [Out] out IEnumPins ppEnum );
> }
>
> When trying to use the next function, I get this error:
>
> An unhandled exception of type
> 'System.Runtime.InteropServices.MarshalDirectiveException' occurred in
> thonaconsulting.directshow.dll
> Additional information: Can not use SizeParamIndex for byref
> array parameters.
>
> That is sad, because I stop having clues on how to get this out.
> Basically I try to get the next x pins. The 2nd parameter (index 1)
> returns an array to the pints taken, and the third parameter returns
> the number of pins put into the arrray.
>
> The error appears under .NET framework 1.1 - no way to check 1.0
> easly.
>
The stack trace shows that the error apears within the marshalling:
at ThonaConsulting.DirectShow.IEnumPins.Next(Int32 cPins, IPin[]&
ppPins, Int32& pcFetched)
at
ThonaConsulting.DirectShow.Utilities.FilterUtility.GetPin(IBaseFilter
Filter, PinDirection Direction) in
c:\work\thonaconsulting\directshow\thonaconsulting.directshow\utilities\
filterutility.cs:line 29
> Any clues?
>
> Thomas Tomiczek
> THONA Consulting Ltd.
> (Microsoft MVP C#/.NET)
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