不使用ATL，如何使用IShellIconOverlayIdentifier组件？

[一魅]

我实现了一个Shell扩展，需要增加一个像SVN标识文件状态的功能，我定义了一个类如下：

class ATL_NO_VTABLE COverlayIcon : 
public CComObjectRootEx<CComSingleThreadModel>,
public IShellIconOverlayIdentifier
{
public:
	COverlayIcon()
	{
	}

	CRefPtr<CShellFolder> m_spFolder;


	BEGIN_COM_MAP(COverlayIcon)
		COM_INTERFACE_ENTRY(IShellIconOverlayIdentifier)
	END_COM_MAP()

	HRESULT Init(CShellFolder* pFolder);

	// IShellIconOverlayIdentifier Methods
	STDMETHOD(GetOverlayInfo)(LPWSTR pwszIconFile,int cchMax,int *pIndex,DWORD* pdwFlags);
	STDMETHOD(GetPriority)(int* pPriority);
	STDMETHOD(IsMemberOf)(LPCWSTR pwszPath,DWORD dwAttrib);

	HRESULT FinalConstruct()
	{
		return S_OK;
	}

	void FinalRelease() 
	{
	}

public:

};

STDMETHODIMP COverlayIcon::GetOverlayInfo(
	LPWSTR pwszIconFile,
	int cchMax,int* pIndex,
	DWORD* pdwFlags)
{
	return S_OK;
}

// IShellIconOverlayIdentifier Method Implementation 

// returns the priority of this overlay 0 being the highest. 
// this overlay is always selected do to its high priority 
STDMETHODIMP COverlayIcon::GetPriority(int* pPriority)
{
	// highest priority
	*pPriority=0;
	return S_OK;
}

// IShellIconOverlayIdentifier Method Implementation
// IShellIconOverlayIdentifier::IsMemberOf
// Returns Whether the object should have this overlay or not 
STDMETHODIMP COverlayIcon::IsMemberOf(LPCWSTR pwszPath, DWORD dwAttrib)
{
	return S_OK;
}

并且在IShellFolder组件 函数里面GetUIObjectOf、CreateViewObject都使用了下面的代码

		if (riid == IID_IShellIconOverlayIdentifier)
		{
			DMMessageBox(NULL,L"1",L"2",0);
			CComObject<COverlayIcon>* pOverlayIcon = NULL;
			HR( CComObject<COverlayIcon>::CreateInstance(&pOverlayIcon) );
			CComPtr<IUnknown> spKeepAlive = pOverlayIcon->GetUnknown();
			HR( pOverlayIcon->Init(this) );
			return pOverlayIcon->QueryInterface(riid, ppRetVal);
		}

注册表也增加成功了，但是调试的时候发现根本就没有走到

		if (riid == IID_IShellIconOverlayIdentifier)
		{
			DMMessageBox(NULL,L"1",L"2",0);
			CComObject<COverlayIcon>* pOverlayIcon = NULL;
			HR( CComObject<COverlayIcon>::CreateInstance(&pOverlayIcon) );
			CComPtr<IUnknown> spKeepAlive = pOverlayIcon->GetUnknown();
			HR( pOverlayIcon->Init(this) );
			return pOverlayIcon->QueryInterface(riid, ppRetVal);
		}

里面，请问有谁知道怎么回事么

[一魅]

只有10个积分了，都没发去技术区发帖，求助各位大神帮忙看下问题，非常感谢。。。。