为什么ITypeInfo::Invoke返回0x80020003 (Member not found.) ?

我在Microsoft Visual c++中从shdocvb .dll实现DShellWindowsEvents的事件接收器时遇到了麻烦。

问题出现在我的IDispatch::Invoke的实现中。我通过将其调用委托给ITypeInfo::Invoke来实现它(正如微软在备注部分所建议的那样)，但它总是失败，错误代码为0x80020003(未找到成员)。

有趣的是，虽然DShellWindowsEvents只有两个方法(WindowRegistered和windowwrevoked)和ITypeInfo::GetIDsOfNames成功地为两者工作，返回预期的DISPID。但是，它是如何给"成员未找到"的错误调用?

类型库的相关部分:

[
  uuid(FE4106E0-399A-11D0-A48C-00A0C90A8F39),
  helpstring("Event interface for IShellWindows")
]
dispinterface DShellWindowsEvents {
    properties:
    methods:
        [id(0x000000c8), helpstring("A new window was registered.")]
        void WindowRegistered([in] long lCookie);
        [id(0x000000c9), helpstring("A new window was revoked.")]
        void WindowRevoked([in] long lCookie);
};
[
  uuid(9BA05972-F6A8-11CF-A442-00A0C90A8F39),
  helpstring("ShellDispatch Load in Shell Context")
]
coclass ShellWindows {
    [default] interface IShellWindows;
    [default, source] dispinterface DShellWindowsEvents;
};

和实际代码

class CDShellWindowsEvents : public DShellWindowsEvents {
public:
    // IUnknown implementation
    virtual HRESULT __stdcall QueryInterface( REFIID riid, LPVOID *ppvObj )
    {
        if( ppvObj == NULL )  return E_INVALIDARG;
        *ppvObj = NULL;
        if(  riid == IID_IUnknown  ||  riid == IID_IDispatch  ||  riid == DIID_DShellWindowsEvents  )
        {
            *ppvObj = this;
            AddRef( );
            return NOERROR;
        }
        return E_NOINTERFACE;
    }
    virtual ULONG __stdcall AddRef( )
    {
        InterlockedIncrement( &m_cRef );
        return m_cRef;
    }
    virtual ULONG __stdcall Release( )
    {
        ULONG ulRefCount = InterlockedDecrement( &m_cRef );
        if( 0 == m_cRef )
            delete this;
        return ulRefCount;
    }

    // IDispatch implementation
    virtual HRESULT __stdcall GetTypeInfoCount( unsigned int * pctinfo )
    {
        if( pctinfo == NULL )  return E_INVALIDARG;
        *pctinfo = 1;
        return NOERROR;
    }
    virtual HRESULT __stdcall GetTypeInfo( unsigned int iTInfo, LCID lcid, ITypeInfo ** ppTInfo )
    {
        if( ppTInfo == NULL )  return E_INVALIDARG;
        *ppTInfo = NULL;
        if( iTInfo != 0 )  return DISP_E_BADINDEX;
        *ppTInfo = m_pTypeInfo;
        m_pTypeInfo->AddRef();
        return NOERROR;
    }
    virtual HRESULT __stdcall GetIDsOfNames(REFIID riid, OLECHAR ** rgszNames, unsigned int cNames, LCID lcid, DISPID * rgDispId )
    {
        return  m_pTypeInfo->GetIDsOfNames( rgszNames, cNames, rgDispId );
    }
    virtual HRESULT __stdcall Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS * pDispParams, VARIANT * pVarResult, EXCEPINFO * pExcepInfo, unsigned int * puArgErr )
    {
        // We could switch on dispIdMember here but we want to do this the flexible way, so we can easily implement it later for dispinterfaces with dozens of methods.
        return  m_pTypeInfo->Invoke( this, dispIdMember, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr );
        /*HRESULT ret;
        switch( dispIdMember )
        {
        case 0x000000c8:    ret = WindowRegistered( pDispParams->rgvarg[0].intVal );  break;
        case 0x000000c9:    ret = WindowRevoked( pDispParams->rgvarg[0].intVal );  break;
        default:            ret = DISP_E_MEMBERNOTFOUND;
        }
        if( pVarResult )  pVarResult->lVal = ret;
        return ret;*/
    }

    // DShellWindowsEvents implementation
    virtual HRESULT __stdcall WindowRegistered( int nCookie )
    {
        LOG( "CDShellWindowsEvents::WindowRegistered( nCookie=0x%X ) ." , nCookie );
        return NOERROR;
    }
    virtual HRESULT __stdcall WindowRevoked( int nCookie )
    {
        LOG( "CDShellWindowsEvents::WindowRevoked( nCookie=0x%X ) ." , nCookie );
        return NOERROR;
    }

    // Constructor
    CDShellWindowsEvents( )
    {
        m_cRef = 1;
        LoadRegTypeLib( LIBID_SHDocVw, 1, 0, LANG_NEUTRAL, &m_pTypeLib );
        m_pTypeLib->GetTypeInfoOfGuid( DIID_DShellWindowsEvents, &m_pTypeInfo );
    }

    // Destructor
    ~CDShellWindowsEvents( )
    {
        m_pTypeInfo->Release( );
        m_pTypeLib->Release( );
    }

private:
    ULONG m_cRef;
    ITypeLib *m_pTypeLib;
    ITypeInfo *m_pTypeInfo;
};

这是类型库没有为disinterface指定double的问题吗?如果是，是否有办法强迫ITypeInfo::调用威胁它作为双重，因为我知道它的虚表是有序的。