//**************************************************************************
//  Description:  Callback class for OPC Data Access 2.0
//**************************************************************************
#ifndef _CONNECT_POINT
#define _CONNECT_POINT

extern CComModule _Module;
#include <atlcom.h>

class OPCCallback :
   public IOPCDataCallback,
   public CComObjectRootEx<CComMultiThreadModel>
{
public:
   OPCCallback() {;}
   virtual  ~OPCCallback(){;}

BEGIN_COM_MAP(OPCCallback)
   COM_INTERFACE_ENTRY(IOPCDataCallback)
END_COM_MAP()

DECLARE_NOT_AGGREGATABLE(OPCCallback)

   // The OPC Callback functions
   STDMETHODIMP OnDataChange(
    DWORD       Transid,
    OPCHANDLE   grphandle,
    HRESULT     masterquality,
    HRESULT     mastererror,
    DWORD       count,
    OPCHANDLE * clienthandles,
    VARIANT   * values,
    WORD      * quality,
    FILETIME  * time,
    HRESULT   * errors);

   STDMETHODIMP OnReadComplete(
    DWORD       Transid,
    OPCHANDLE   grphandle,
    HRESULT     masterquality,
    HRESULT     mastererror,
    DWORD       count,
    OPCHANDLE * clienthandles,
    VARIANT   * values,
    WORD      * quality,
    FILETIME  * time,
    HRESULT   * errors);

   STDMETHODIMP OnWriteComplete(
    DWORD       Transid,
    OPCHANDLE   grphandle,
    HRESULT     mastererr,
    DWORD       count,
    OPCHANDLE * clienthandles,
    HRESULT   * errors);

   STDMETHODIMP OnCancelComplete(
    DWORD       transid,
    OPCHANDLE   grphandle);
};

typedef CComObject<OPCCallback> OPCCallbackObject;

//**************************************************************************
class OPCShutdown :
   public IOPCShutdown,
   public CComObjectRootEx<CComMultiThreadModel>
{
public:
   OPCShutdown() {;}
   virtual  ~OPCShutdown(){;}

BEGIN_COM_MAP(OPCShutdown)
   COM_INTERFACE_ENTRY(IOPCShutdown)
END_COM_MAP()

DECLARE_NOT_AGGREGATABLE(OPCShutdown)

   // The OPC Callback function
   STDMETHODIMP ShutdownRequest(LPCWSTR szReason);

   CString reason;
};

typedef CComObject<OPCShutdown> OPCShutdownObject;

#endif