//
// Callback.h : Declaration of callback class and definition of minor methods
//
//--------------------------------------------------------- 
// (c) COPYRIGHT 2003,2004 http://www.opc-china.com INC.
// ALL RIGHTS RESERVED
// Original Author:Jigang Si
// Original Author Email:economic@126.com 
//--------------------------------------------------------- 
class COPCDataCallback :
public CComObjectRoot,public IOPCDataCallback
{
public:
	COPCDataCallback() {};
	BEGIN_COM_MAP(COPCDataCallback)
		COM_INTERFACE_ENTRY(IOPCDataCallback)
		END_COM_MAP()
		// IOPCDataCallback 
		STDMETHODIMP  OnDataChange( 
            /* [in] */ DWORD dwTransid,
            /* [in] */ OPCHANDLE hGroup,
            /* [in] */ HRESULT hrMasterquality,
            /* [in] */ HRESULT hrMastererror,
            /* [in] */ DWORD dwCount,
            /* [size_is][in] */ OPCHANDLE __RPC_FAR *phClientItems,
            /* [size_is][in] */ VARIANT __RPC_FAR *pvValues,
            /* [size_is][in] */ WORD __RPC_FAR *pwQualities,
            /* [size_is][in] */ FILETIME __RPC_FAR *pftTimeStamps,
            /* [size_is][in] */ HRESULT __RPC_FAR *pErrors);
		STDMETHODIMP  OnReadComplete( 
            /* [in] */ DWORD dwTransid,
            /* [in] */ OPCHANDLE hGroup,
            /* [in] */ HRESULT hrMasterquality,
            /* [in] */ HRESULT hrMastererror,
            /* [in] */ DWORD dwCount,
            /* [size_is][in] */ OPCHANDLE __RPC_FAR *phClientItems,
            /* [size_is][in] */ VARIANT __RPC_FAR *pvValues,
            /* [size_is][in] */ WORD __RPC_FAR *pwQualities,
            /* [size_is][in] */ FILETIME __RPC_FAR *pftTimeStamps,
            /* [size_is][in] */ HRESULT __RPC_FAR *pErrors);        
        STDMETHODIMP  OnWriteComplete( 
            /* [in] */ DWORD dwTransid,
            /* [in] */ OPCHANDLE hGroup,
            /* [in] */ HRESULT hrMastererr,
            /* [in] */ DWORD dwCount,
            /* [size_is][in] */ OPCHANDLE __RPC_FAR *pClienthandles,
            /* [size_is][in] */ HRESULT __RPC_FAR *pErrors);        
        STDMETHODIMP  OnCancelComplete( 
            /* [in] */ DWORD dwTransid,
            /* [in] */ OPCHANDLE hGroup) 
		{
			return S_OK;
		};
};