CoMarshalInterThreadInterfaceInStream problems

From:

"bourne" <bourne_hlm@163.com>

Newsgroups:

microsoft.public.vc.atl

Date:

9 Oct 2006 05:30:28 -0700

Message-ID:

<1160397028.139139.97140@i3g2000cwc.googlegroups.com>

Hi all:
  I have a com class implements two com interfaces:

[
object,
uuid("827E9256-AEF5-4338-9B4B-8109DC7F6050"),
helpstring("IBasePlayer Interface"),
pointer_default(unique)
]
__interface IBasePlayer : IUnknown {
  ...
}

[
object,
uuid("63E39D66-862C-475d-B0ED-C6BB8B31618F"),
helpstring("IBasePlayer2 Interface"),
pointer_default(unique)
]
__interface IBasePlayer2 : IUnknown{
...
}

class ATL_NO_VTABLE CoStreamPlayer :
public IBasePlayer, public IBasePlayer2{

  ...
  BEGIN_COM_MAP(CoStreamPlayer)
COM_INTERFACE_ENTRY(IBasePlayer)
COM_INTERFACE_ENTRY(IBasePlayer2)
  END_COM_MAP()
  ...
}

//my marshal code:
HRESULT hr = S_OK;
IStream *pStream = NULL;
CComPtr<IBasePlayer> pbp;
pbp.CoCreateInstance(CLSID_CoStreamPlayer);
hr = CoMarshalInterThreadInterfaceInStream(IID_IBasePlayer, pbp,
&pStream); // ok

CQIComPtr<IBasePlayer2> pbp2 = pbp; // ok
hr = CoMarshalInterThreadInterfaceInStream(IID_IBasePlayer2, pbp2,
&pStream); // return E_NOINTERFACE

why call CoMarshalInterThreadInterfaceInStream with IBasePlayer2 return
E_NOINTERFACE? Can anybody help me ? Thanks very much.

bourne
2006-10-09