C#调用C++写的下载网络流的sourcefilter解决方案

DECLARE_INTERFACE_(INetReceiver, IUnknown){    STDMETHOD(SetStreamType) (THIS_        long inType    ) PURE;    STDMETHOD(SetSize) (THIS_        long inTotalSize, long inCheckOffset    ) PURE;    STDMETHOD(SetStreamSocket) (THIS_        SOCKET inSocket        ) PURE;    STDMETHOD(StartReceiving) (THIS) PURE;    STDMETHOD(StopReceiving) (THIS) PURE;    STDMETHOD(CanConnectToDownstream) (THIS) PURE;};

[ComImport, Guid("3F565AA9-3004-4f82-8882-174D51C73332")]    public class FilterNetReceiver    {    }    [Guid("8D2AE29A-2783-416c-B40F-790E2FE83267"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]    public interface ISourceFilter    {        [PreserveSig]        bool SetStreamType(long inType);        [PreserveSig]        bool SetSize(long inTotalSize, long inCheckOffset);        [PreserveSig]        bool SetStreamSocket(Socket inSocket);        [PreserveSig]        bool StartReceiving();        [PreserveSig]        bool StopReceiving();        [PreserveSig]        bool CanConnectToDownstream();    }