求助：'static_cast' : ambiguous conversions from 的问题！

[wenqinwuhai]

'static_cast' : ambiguous conversions from 'class CMyCallBack *' to 'struct IDispatch *' 这是错误！环境是

class ATL_NO_VTABLE CMyCallBack : 
	public CComObjectRootEx<CComSingleThreadModel>,
	public IDispatchImpl<IMyCallBack, &IID_IMyCallBack, &LIBID_ZlinkPhone>,
	public CComControl<CMyCallBack>,
	public IPersistStreamInitImpl<CMyCallBack>,
	public IOleControlImpl<CMyCallBack>,
	public IOleObjectImpl<CMyCallBack>,
	public IOleInPlaceActiveObjectImpl<CMyCallBack>,
	public IViewObjectExImpl<CMyCallBack>,
	public IOleInPlaceObjectWindowlessImpl<CMyCallBack>,
	public IPersistStorageImpl<CMyCallBack>,
	public ISpecifyPropertyPagesImpl<CMyCallBack>,
	public IQuickActivateImpl<CMyCallBack>,
	public IDataObjectImpl<CMyCallBack>,
	public IProvideClassInfo2Impl<&CLSID_MyCallBack, NULL, &LIBID_ZlinkPhone>,
	public CComCoClass<CMyCallBack, &CLSID_MyCallBack>,
	public IDispatchImpl<ISIPCallBack, &__uuidof(ISIPCallBack), &LIBID_AvCtrlLib, /* wMajor = */ 1, /* wMinor = */ 0>
BEGIN_COM_MAP(CMyCallBack)
	COM_INTERFACE_ENTRY(IMyCallBack)
	//COM_INTERFACE_ENTRY(IDispatch)
	COM_INTERFACE_ENTRY2(IDispatch, ISIPCallBack)
	//COM_INTERFACE_ENTRY(ISIPCallBack)
	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(ISpecifyPropertyPages)
	COM_INTERFACE_ENTRY(IQuickActivate)
	COM_INTERFACE_ENTRY(IPersistStorage)
	COM_INTERFACE_ENTRY(IDataObject)
	COM_INTERFACE_ENTRY(IProvideClassInfo)
	COM_INTERFACE_ENTRY(IProvideClassInfo2)

根据论坛的一些资料更改，但还是有问题。我用的是VC6.0。ISIPCallBack 是来自2003 atl编译的DLL组件。应该怎么更改让他编译成功啊！
mycallback.h(42) : error C2594: 'static_cast' : ambiguous conversions from 'class CMyCallBack *' to 'struct IDispatch *'
Generating Code...
Compiling...
Error executing cl.exe.
Creating browse info file...

[wenqinwuhai]

哪应该怎么更改一下？原始生成的结构是：

BEGIN_COM_MAP(CMyCallBack)
	COM_INTERFACE_ENTRY(IMyCallBack)
	COM_INTERFACE_ENTRY(IDispatch)
	COM_INTERFACE_ENTRY2(IDispatch, ISIPCallBack)//要加入ISIPCallBack
	//COM_INTERFACE_ENTRY(ISIPCallBack)
	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(ISpecifyPropertyPages)
	COM_INTERFACE_ENTRY(IQuickActivate)
	COM_INTERFACE_ENTRY(IPersistStorage)
	COM_INTERFACE_ENTRY(IDataObject)
	COM_INTERFACE_ENTRY(IProvideClassInfo)
	COM_INTERFACE_ENTRY(IProvideClassInfo2)
	//COM_INTERFACE_ENTRY2(IDispatch, ISIPCallBack)
	//COM_INTERFACE_ENTRY(ISIPCallBack)
END_COM_MAP()

[wenqinwuhai]

自己解决！结贴给分！

[mengde007]

你所继承的一些接口或者类是不是也从IDispatch派生过来的，如果是的话，问题就在这儿了。

[wenqinwuhai]

IMyCallBack ISIPCallBack 都是IDispatch 但我用了COM_INTERFACE_ENTRY2 。哪个地方用错了？

[mengde007]

static_cast转换时，会把this指针加上或减去一定的偏移。你这么写让偏移有了多个值，因此才有了ambiguous 二意性质。

[qq727791967]

怎么解决的啊 说说