基于OPC协议的上位机PLC通讯 (二) 异步回调部分
//---------------------------------------------------------
// OPC Custom 2.0 Sample
// Asynchronous IO with MFC and ATL
// (c) Siemens AG 2000
//---------------------------------------------------------
//
// Callback.h : Declaration of callback class and definition of minor methods
//
#include "OPCRes.h"
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;
};
void InformAbout (OPCRes *pOPCRes)
{
m_pOPCRes = pOPCRes;
}
protected:
OPCRes * m_pOPCRes;
};
实现callback.cpp
#include "stdafx.h"
#include "pre_opc.h"
#include "Callback.h" // for OPC: include class declaration for this callback class
#include "../../HYWL01.h"
#include "../../MainDlg.h"
////////////////////////////////////
CString GetQualityText(UINT qnr);
//text description from quality code
/////////////////////////////////////////////////////////////////////////////
//
// IOPCDataCallback - implementation
// OnDataChange called by OPC server when the OPC server has detected modified data
// (being called only when group and item is set to active)
STDMETHODIMP COPCDataCallback:: 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)
{
DWORD i,j;
for (i = 0; i<dwCount; i++)//除第一次，回调函数检测到有dwCount个值发生变化,i是控制循环遍历的次数
{
for( j = 0 ; j<m_pOPCRes->GetAsyncCount() ;j++)// j用来遍历每一个项
{
if( (phClientItems[i] == j) && (pErrors[i] == S_OK) )//phClientItems[i]存放了有变化的异步项的序号
{
m_pOPCRes->m_ReadVal_A[j]=pvValues[i].intVal;
m_pOPCRes->m_ReadQu_A[j].Format("%s",GetQualityText(pwQualities[i]));
m_pOPCRes->m_ReadTs_A[j]=COleDateTime( pftTimeStamps[i] ).Format();
break;
}
}
}
return S_OK;
};
STDMETHODIMP COPCDataCallback::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)
{
DWORD i;
for (i = 0; i<dwCount; i++)
{
if( pErrors[i] == S_OK)
{
m_pOPCRes->m_ReadVal_A[i]=pvValues[i].intVal;
m_pOPCRes->m_ReadQu_A[i].Format("%s",GetQualityText(pwQualities[i]));
m_pOPCRes->m_ReadTs_A[i]=COleDateTime( pftTimeStamps[i] ).Format();
}
else
{
/* error case: display error text */
CString readQuality = GetQualityText(pErrors[i]);
m_pOPCRes->m_ReadQu_A[i]=readQuality;
}
}
return S_OK;
};
////////////////////////////////////////////////////////////////////////////////////////////
//异步写入未实现
STDMETHODIMP COPCDataCallback::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)
{
return S_OK;
};
///////////////////////////////////////////////////////////////////////////////////////////
//品质值转换字符信息函数
CString GetQualityText(UINT qnr)
{
CString qstr;
switch(qnr)
{
case OPC_QUALITY_BAD:
qstr = "BAD";
break;
case OPC_QUALITY_UNCERTAIN:
qstr = "UNCERTAIN";
break;
case OPC_QUALITY_GOOD:
qstr = "GOOD";
break;
case OPC_QUALITY_NOT_CONNECTED:
qstr = "NOT_CONNECTED";
break;
case OPC_QUALITY_DEVICE_FAILURE:
qstr = "DEVICE_FAILURE";
break;
case OPC_QUALITY_SENSOR_FAILURE:
qstr = "SENSOR_FAILURE";
break;
case OPC_QUALITY_LAST_KNOWN:
qstr = "LAST_KNOWN";
break;
case OPC_QUALITY_COMM_FAILURE:
qstr = "COMM_FAILURE";
break;
case OPC_QUALITY_OUT_OF_SERVICE:
qstr = "OUT_OF_SERVICE";
break;
case OPC_QUALITY_LAST_USABLE:
qstr = "LAST_USABLE";
break;
case OPC_QUALITY_SENSOR_CAL:
qstr = "SENSOR_CAL";
break;
case OPC_QUALITY_EGU_EXCEEDED:
qstr = "EGU_EXCEEDED";
break;
case OPC_QUALITY_SUB_NORMAL:
qstr = "SUB_NORMAL";
break;
case OPC_QUALITY_LOCAL_OVERRIDE:
qstr = "LOCAL_OVERRIDE";
break;
default:
qstr = "UNKNOWN ERROR";
}
return qstr;
}