Re: How to return parameters in an ATL COM component event function?

Christian Berczely <>
Mon, 2 Jun 2008 11:45:20 -0700 (PDT)
I was able to get it working with the CComVariant like this:

HRESULT Fire_Continue(VARIANT_BOOL * pContinue, long * pNumb)
        T* pT = static_cast<T*>(this);
        int nConnectionIndex;
        int nConnections = m_vec.GetSize();

        CComVariant varResult;
        CComVariant* pvars = new CComVariant[2];

        VARIANT_BOOL vntbContinue = *pContinue; // you can pass in a
parameter in case it needs to be processed here
        long lNumb = *pNumb;

        for (nConnectionIndex = 0; nConnectionIndex < nConnections;
            CComPtr<IUnknown> sp = m_vec.GetAt(nConnectionIndex);
            IDispatch* pDispatch = reinterpret_cast<IDispatch*>(sp.p);
            if (pDispatch != NULL)


                V_VT(&pvars[1]) = VT_BYREF | VT_BOOL;
                V_BOOLREF(&pvars[1]) = &vntbContinue;

                V_VT(&pvars[0]) = VT_BYREF | VT_I4;
                V_I4REF(&pvars[0]) = &lNumb;

                DISPPARAMS disp = { pvars, NULL, 2, 0 };
                pDispatch->Invoke(0x1, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &disp, &varResult, NULL, NULL);
        *pContinue = vntbContinue;
        *pNumb = lNumb;


        return varResult.scode;

Thank you!

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