Pass ATL/ActiveX object events to javascript

From:

=?Utf-8?B?Q2hyaXM=?= <Chris@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.activex.templatelib,microsoft.public.vc.atl

Date:

Thu, 25 Sep 2008 20:21:00 -0700

Message-ID:

<AB98C727-BD7F-4F58-B587-F06BF1FE8B2D@microsoft.com>

Hi,

I'm pretty new to ATL development and I have a activeX ATL control embeded
in an html page. The page also defines some javascript which I'd like to call
from my ActiveX object (ATL control). From reading several articles I realize
I could to use connectionpoints to accomplish this. However, I'm stuck with
a compile error:

error C2787: '_IWebPluginControlEvents' : no GUID has been associated with
this object.

Any help is greatly apperciated!

I have defined a connectionpoint within my IDL file as follows:

In "WebPlugin.idl"

[
uuid(FD84D4F2-4D92-48DE-9A16-0D2F1A43DD6D),
helpstring("_IWebPluginControlEvents")
]

dispinterface _IWebPluginControlEvents
{
   properties:
   methods:
   [id(1), helpstring("method Finished")] HRESULT Finished();
};

coclass WebPluginControl
{
   [default] interface IWebPluginControl;
   [default, source] dispinterface _IWebPluginControlEvents;
};

I have implemented IProvideClassInfo2Imp and added the COM_ENTRIES as follows:
WebPluginControl.h

// CWebPluginControl
class ATL_NO_VTABLE CWebPluginControl :
    public CComObjectRootEx<CComSingleThreadModel>,
    public IDispatchImpl<IWebPluginControl, &IID_IWebPluginControl,
&LIBID_WebPluginLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
    public IPersistStreamInitImpl<CWebPluginControl>,
    public IOleControlImpl<CWebPluginControl>,
    public IOleObjectImpl<CWebPluginControl>,
    public IOleInPlaceActiveObjectImpl<CWebPluginControl>,
    public IViewObjectExImpl<CWebPluginControl>,
    public IOleInPlaceObjectWindowlessImpl<CWebPluginControl>,
    public ISupportErrorInfo,
    public IPersistStorageImpl<CWebPluginControl>,
    public ISpecifyPropertyPagesImpl<CWebPluginControl>,
    public IQuickActivateImpl<CWebPluginControl>,
    public IDataObjectImpl<CWebPluginControl>,
    public IProvideClassInfo2Impl<&CLSID_WebPluginControl,
&__uuidof(_IWebPluginControlEvents), &LIBID_WebPluginLib>,
    public IObjectSafetyImpl<CWebPluginControl,
INTERFACESAFE_FOR_UNTRUSTED_CALLER>,
    public IConnectionPointContainerImpl<CWebPluginControl>,
    public
IConnectionPointImpl<CWebPluginControl,&__uuidof(_IWebPluginControlEvents)>,
    public IPropertyNotifySinkCP<CWebPluginControl>,
    public IPersistPropertyBagImpl<CWebPluginControl>,
    public CComCoClass<CWebPluginControl, &CLSID_WebPluginControl>,
    public CComControl <CWebPluginControl>,
    public CProxy_IWebPluginControlEvents<CWebPluginControl>

BEGIN_COM_MAP(CWebPluginControl)
    COM_INTERFACE_ENTRY(IWebPluginControl)
    COM_INTERFACE_ENTRY(IDispatch)
    COM_INTERFACE_ENTRY(IViewObjectEx)
    COM_INTERFACE_ENTRY(IViewObject2)
    COM_INTERFACE_ENTRY(IViewObject)
    COM_INTERFACE_ENTRY(IOleInPlaceObjectWindowless)
    COM_INTERFACE_ENTRY(IOleInPlaceObject)
    COM_INTERFACE_ENTRY2(IOleWindow, IOleInPlaceObjectWindowless)
    COM_INTERFACE_ENTRY(IOleInPlaceActiveObject)
    COM_INTERFACE_ENTRY(IOleControl)
    COM_INTERFACE_ENTRY(IOleObject)
    COM_INTERFACE_ENTRY(IPersistStreamInit)
    COM_INTERFACE_ENTRY2(IPersist, IPersistStreamInit)
    COM_INTERFACE_ENTRY_IMPL(IConnectionPointContainer)
    COM_INTERFACE_ENTRY(ISupportErrorInfo)
    COM_INTERFACE_ENTRY(ISpecifyPropertyPages)
    COM_INTERFACE_ENTRY(IQuickActivate)
    COM_INTERFACE_ENTRY(IPersistStorage)
    COM_INTERFACE_ENTRY(IDataObject)
    COM_INTERFACE_ENTRY(IProvideClassInfo)
    COM_INTERFACE_ENTRY(IProvideClassInfo2)
    COM_INTERFACE_ENTRY(IPersistPropertyBag)
    COM_INTERFACE_ENTRY_IID(IID_IObjectSafety, IObjectSafety)
    COM_INTERFACE_ENTRY(IConnectionPointContainer)
END_COM_MAP()

BEGIN_CONNECTION_POINT_MAP(CWebPluginControl)
    CONNECTION_POINT_ENTRY(__uuidof(_IWebPluginControlEvents))
    CONNECTION_POINT_ENTRY(IID_IPropertyNotifySink)
END_CONNECTION_POINT_MAP()

The proxy class (auto-generated) looks like:

// Wizard-generated connection point proxy class
// WARNING: This file may be regenerated by the wizard

#pragma once

template<class T>
class CProxy_IWebPluginControlEvents :
    public IConnectionPointImpl<T, &__uuidof(_IWebPluginControlEvents)>
{
public:
    HRESULT Fire_Finished()
    {
        HRESULT hr = S_OK;
        T * pThis = static_cast<T *>(this);
        int cConnections = m_vec.GetSize();

        for (int iConnection = 0; iConnection < cConnections; iConnection++)
        {
            pThis->Lock();
            CComPtr<IUnknown> punkConnection = m_vec.GetAt(iConnection);
            pThis->Unlock();

            IDispatch * pConnection = static_cast<IDispatch *>(punkConnection.p);

            if (pConnection)
            {
                CComVariant varResult;

                DISPPARAMS params = { NULL, NULL, 0, 0 };
                hr = pConnection->Invoke(1, IID_NULL, LOCALE_USER_DEFAULT,
DISPATCH_METHOD, &params, &varResult, NULL, NULL);
            }
        }
        return hr;
    }
};

I am using Visual Studio 2003 under windows XP SP2
MIDL compiler version 6.00.0361
Every ATL.dll on my system is versioned > 3 (not sure how to check the exect
one visual studio is using)