item.h

此文件为VC++开发环境下的OPC client trend 源代码

/////////////////////////////////////////////////////////////////////////////
//
//  OPC Trend VC++ Client:	Item.h
//							(Header File)
//
/////////////////////////////////////////////////////////////////////////////
//
//          Author: Raphael Imhof
//    Initial Date: 11/04/98
//       $Workfile: Item.h $
//       $Revision: 1 $
//           $Date: 7/27/99 5:24p $
//   Target System: Microsoft Windows NT 4.0
//     Environment: Visual C++ 5.0 / OPC DataAccess 1.0 / 2.0
//         Remarks: 
//
/////////////////////////////////////////////////////////////////////////////
//
//     Description: interface of the CItem class.
//					Encapsulation of item related methods.
//					
//
/////////////////////////////////////////////////////////////////////////////
//
//  History of Changes     (Please remove very old comments and blank lines!)
//            $Log: /IDK/OPCServer/clients/VC++/Trend/Item.h $
// 
// 1     7/27/99 5:24p Imhof
// 
// 1     7/27/99 5:19p Imhof
// 
// 5     1/15/99 7:04p Imhof
// Updated legal notice.
// 
// 4     12/15/98 10:30a Imhof
// Modifications for OPC 2.0
// 
// 3     11/06/98 5:53p Imhof
// Added header, comment and made some small code changes.
// 
// 
//  $Nokeywords:$ (To avoid useless search while checking in.)
/////////////////////////////////////////////////////////////////////////////
//  Copyright (C) 1998, Siemens Building Technologies, Inc. Landis Division
//
// SIEMENS BUILDING TECHNOLOGIES, INC. IS PROVIDING THE FOLLOWING
// EXAMPLES OF CODE AS SAMPLE ONLY.
//
// SIEMENS BUILDING TECHNOLOGIES, INC.  MAKES NO REPRESENTATIONS
// OR WARRANTIES OF ANY KIND  WITH RESPECT TO THE VALIDTY OF THE 
// CODES   OR   DESIRED   RESULTS   AND   DISCLAIMS   ALL   SUCH 
// REPRESENTATIONS   AND   WARRANTIES,  INCLUDING  FOR  EXAMPLE, 
// WARRANTIES  OF  MERCHANTABILITY  AND FITNESS FOR A PARTICULAR 
// PURPOSE.    SIEMENS  BUILIDNG  TECHNOLOGIES,  INC.  DOES  NOT 
// REPRESENT  OR  WARRANT  THAT  THE  FOLLOWING CODE SAMPLES ARE 
// ACCURATE, VALID, COMPLETE OR CURRENT.
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_ITEM_H__451D47C7_2B19_11D2_AD89_00104B2C9D06__INCLUDED_)
#define AFX_ITEM_H__451D47C7_2B19_11D2_AD89_00104B2C9D06__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

//forward
class CGroup;

#include "base.h"
#include "Group.h"

class CItem : public CBase<IOPCItemMgt>
{
public:
	VARIANT GetValue();
	void SetValue(VARIANT value);
	WORD GetQuality();
	void SetQuality(WORD quality);
	VARTYPE GetDataType();
	void SetDataType(VARTYPE data_type);
	FILETIME GetTimeStamp();
	void SetTimeStamp(FILETIME time_stamp);
	CItem();
	virtual ~CItem();
	CGroup* GetGroup();
	void SetGroup(CGroup* pGroup);

	//trend specific
	BOOL LoadTrendData();
	unsigned int GetTrendData(CArray<OPCITEMSTATE, OPCITEMSTATE>** trend_data);

	DWORD GetRequestedSamples();

protected:
	DECLARE_DYNCREATE(CItem)

private:
	VARTYPE		m_data_type;
	WORD		m_quality;
	VARIANT		m_value;
	FILETIME	m_timeStamp;
	CGroup*		m_pGroup;
	DWORD		m_dwRequestedSamples;

	CArray<OPCITEMSTATE, OPCITEMSTATE> m_TrenData;
};

#endif // !defined(AFX_ITEM_H__451D47C7_2B19_11D2_AD89_00104B2C9D06__INCLUDED_)