QT中的OpcDa 客户端 实现

前段时间开发Windows下的设备端软件接触到了OPC DA，虽然现在有了更强大的OPC UA，但是为了兼容一些老的设备，不得不硬着头皮去啃这个老掉牙的已经过时了的技术。本来只是想粗略了解一下，简单写一个应付了事，谁知道过程一波三折。

由于OPCDA采用COM技术，而我又不想再去学COM编程以及VC、AFX、MFC，我采取调用 WTClient 的懒人方法，并且只花了几个小时就整了一个出来，简单测试通过，结果经同事验证，Float、long等类型通通无法读取无法写入，并且每隔半小时左右便与Kepsrever断开连接。然后到处找解决方案，最后在官方网站得到答案：免费版本有30分钟时间限制，数据类型估计也顺手给限了，只有BOOL和WORD少数几个类型可以使用，这期间又是浪费好多时间。

经过这番教训，决定用QT从头开始写一个自己的库，于是有了以下内容，提供给需要的人，稍候会传到github(早已传上去了，但是忘记修改本文，需要的去拿吧：https://github.com/cncap/qt-opcda)。

参考：OPCDA服务器与客户程序开发指南修订版

#ifndef OPCCLIENT_H
#define OPCCLIENT_H
#include <iostream>
#include "opcerror.h"
#include "opccomn.h"
#include "OpcEnum.h"
#include "Opcda.h"
#include "copctransaction.h"
#include "wldef.h"
#include <QObject>
#include <QDebug>
#include "windows.h"
/**
 * Copyright 2016 Chn.Captain (chn.captain@gmail.com)
 */
class COPCDataCallback;
class ItemDef
{
public:
  QString    name;
  DWORD         accessRights;
  VARIANT    value;
  WORD        quality;
  OPCHANDLE    hServerHandle;
  OPCHANDLE    hClientHandle;
  FILETIME    time;
  VARTYPE    type;
  ItemDef()
  {
    type = VT_EMPTY;
    quality = 0;
    hServerHandle = 0;
    hClientHandle = 0;

    //ZeroMemory(&time, sizeof(time));
  }
  ItemDef( const ItemDef& it )
  {
    name =        it.name;
    value =        it.value;
    quality =        it.quality;
    hServerHandle =     it.hServerHandle;
    hClientHandle =     it.hClientHandle;
    time =        it.time;
    type =        it.type;
  }
};

class OPCClient:public QObject
{
  Q_OBJECT
public:
  explicit OPCClient();
  OPCClient(QString s);
  ~OPCClient();
  COPCTransaction *m_COPCTransaction;

  bool isWriteAble;

  bool isConnected();
  HRESULT Connect(QString s);
  void DisConnect();
  HRESULT AddGroup(QString n, DWORD update_rate , int async=1);
  QStringList AddItems(QStringList names);
  bool ReadItem(ItemDef *item);

  bool WriteValue(QString &name, QString &value );
  bool WriteValue( DWORD cHandle, FILETIME &time, VARIANT &value, WORD Quality );
  HRESULT WriteValue_Async(ItemDef * item);
  HRESULT WriteValue_Sync (ItemDef * item);

  HRESULT RemoveItems(QStringList inames);
  HRESULT RemoveAllItems();

  void dataCallback();
  QList<ItemDef*> *items;

  QString VariantString(VARIANT &pValue);
  QString QualityString(UINT qnr);
  QString ValueTypeString(const VARTYPE& v);
  void StringVariant(ItemDef* item, QString v);
  QString AccessTypeString(qint16 accessIdent);
  QString TimeString(FILETIME t);

  HRESULT hResult;
  HRESULT *pErrors;

  WString  m_ServerName;
  WString  m_GroupName;
  DWORD    m_UpdateRate;
  CLSID    m_clsid;
  DWORD       m_Cookie;
  bool     m_Async;

  IConnectionPointContainer* _pIConnectionPointContainer;
  IConnectionPoint* _pIConnectionPoint;
  IOPCServer *_pIOPCServer;
  IOPCBrowseServerAddressSpace *_pIOpcNamespace;
  IOPCItemProperties *_pIOpcProperties;
  IOPCGroupStateMgt *_pIOPCGroupStateMgt;
  IOPCItemMgt *_pIOPCItemMgt;
  IOPCSyncIO * _pIOPCSyncIO;
  IOPCAsyncIO2 * _pIOPCAsyncIO2;
  IOPCDataCallback * _pIOPCDataCallback;
  COPCDataCallback *m_OPCDataCallback;

  OPCHANDLE  m_GroupHandle;
  OPCHANDLE  m_ServerHandle;
  void       ClearOPCITEMDEF( OPCITEMDEF *idef, int count = 1 );
  ItemDef*   getItemByName(QString s);
  ItemDef*   getItemByHandle(DWORD h);
  WString    qstr2Wstr(QString s);

};

#endif //OPCCLIENT_H

#include "OPCClient.h"
#include "copcdatacallback.h"
#include <QDateTime>
#include <QMessageBox>
/**
 * Copyright 2016 Chn.Captain (chn.captain@gmail.com)
 */
OPCClient::OPCClient(QString s):
  m_ServerName(qstr2Wstr(s))
{
}
OPCClient::OPCClient()
{
  _pIConnectionPointContainer = NULL;
  _pIConnectionPoint          = NULL;
  _pIOPCServer                = NULL;
  _pIOPCDataCallback          = NULL;
  _pIOpcNamespace             = NULL;
  _pIOpcProperties            = NULL;
  _pIOPCGroupStateMgt         = NULL;
  _pIOPCItemMgt               = NULL;
  _pIOPCSyncIO                = NULL;
  _pIOPCAsyncIO2              = NULL;
  m_GroupHandle               = 0;
  m_ServerHandle              = 0;
  m_OPCDataCallback           = NULL;
  m_COPCTransaction           = NULL;
  m_Cookie                    = 0;
  pErrors                     = NULL;
  //state
  isWriteAble                 = NULL;

  items = new QList<ItemDef*>();
}
/**
 * 建立OPC连接
 * @brief OPCClient::Connect
 * @param s
 * @return
 */
HRESULT OPCClient::Connect(QString s)
{
  this->m_ServerName = qstr2Wstr(s);
  hResult = CoInitialize(0);
  if (FAILED(hResult))
    {
      if (hResult == S_FALSE)
        {
          qDebug()<<"Error CoInitialize():COM Library already initialized";
        }
      else
        {
          qDebug()<< "Error CoInitialize()：Initialisation of COM Library failed. Error Code= " << hResult;
          _pIOPCServer = 0;
          CoUninitialize();
          return hResult;
        }
    }

  hResult = CLSIDFromProgID(this->m_ServerName, &this->m_clsid);
  if (FAILED(hResult))
    {
      qDebug()<< "Error CLSIDFromProgID():Retrival of CLSID failed";
      CoUninitialize();
      return hResult;
    }

  hResult = CoCreateInstance (this->m_clsid, NULL, CLSCTX_LOCAL_SERVER ,IID_IOPCServer, (void**)&_pIOPCServer);
  if (FAILED(hResult))
    {
      qDebug()<< "Error CoCreateInstance():Creation of IOPCServer-Object failed";
      _pIOPCServer = 0;
      CoTaskMemFree(&this->m_clsid);
      CoUninitialize();
      return hResult;
    }
  hResult = _pIOPCServer->QueryInterface(IID_IOPCBrowseServerAddressSpace, (void**)&_pIOpcNamespace);
  if (FAILED(hResult))
    {

      qDebug()<< "Error CoCreateInstance():Creation of IID_IOPCBrowseServerAddressSpace-Object failed";
      CoUninitialize();
      return hResult;
    }
  hResult = _pIOPCServer->QueryInterface(IID_IOPCItemProperties, (void**)&_pIOpcProperties);
  if (FAILED(hResult))
    {
      qDebug()<< "Error CoCreateInstance():Creation of IID_IOPCItemProperties-Object failed";
      CoUninitialize();
      return hResult;
    }
  return hResult;
}

/**
 * 添加分组
 * @brief OPCClient::AddGroup
 * @param n
 * @param update_rate
 * @return
 */
HRESULT OPCClient::AddGroup(QString n, DWORD update_rate, int async)
{
  m_Async = async;
  m_GroupName = qstr2Wstr(n);
  m_ServerHandle = 1;
  m_UpdateRate = 100;
  long TimeBias;
  DWORD LanguageCode = 0x416, RevisedUpdateRate;
  float DeadBand; //刷新间隔
  hResult=_pIOPCServer->AddGroup(m_GroupName,  // [in] group name
                                 TRUE,                  // [in] active
                                 update_rate,           // [in] request this Update Rate from Server
                                 m_ServerHandle,        // [in] Client handle
                                 &TimeBias,             // [in] no time interval to system UTC time
                                 &DeadBand,             // [in] no deadband, so all data changes are reported
                                 LanguageCode,          // [in] Server uses English language for text values
                                 &m_GroupHandle,        // [out] Server handle to identify this group in later calls
                                 &RevisedUpdateRate,    // [out] the answer form the Server to the requested update rate
                                 IID_IOPCGroupStateMgt, // [in] requested interface type of the group object
                                 (LPUNKNOWN*)&this->_pIOPCGroupStateMgt); // [out] pointer to the requested interface

  if( hResult ==OPC_E_DUPLICATENAME ) {
      qDebug()<< "1001:分组名称已存在.";
    }
  if( hResult ==E_NOINTERFACE ) {
      qDebug()<< "1002:IOPCServer::AddGroup returned E_NOINTERFACE (IID_IOPCGroupStateMgt)";
    }
  if( update_rate != m_UpdateRate ){
      qDebug()<< "1003: OPC server rejected data refresh interval. Setting it to %1 ms." << update_rate;
    }
  if (hResult == OPC_S_UNSUPPORTEDRATE)
    {
      qDebug()<< "1004:请求的刷新速率与实际的刷新速率不一致";
    }
  if( FAILED(hResult) || _pIOPCGroupStateMgt == NULL) {
      qDebug()<< "1005: 创建分组失败";
      DisConnect();
    }

  hResult = _pIOPCGroupStateMgt->QueryInterface(IID_IOPCItemMgt,(void**)&this->_pIOPCItemMgt);
  if (FAILED(hResult))  {
      qDebug()<<"1006: 项目操作指针(_pIOPCItemMgt)创建失败";
      DisConnect();
    }
  //查询 group 对象的同步接口



  if(m_Async){
      hResult = _pIOPCItemMgt->QueryInterface(IID_IOPCAsyncIO2, (void**)&this->_pIOPCAsyncIO2);
      if (FAILED(hResult))  {
          qDebug()<<"1008: IOPCAsyncIO2 没有发现，错误的查询!";
          DisConnect();
        }

      m_COPCTransaction = new COPCTransaction;
      hResult = _pIOPCItemMgt->QueryInterface(IID_IConnectionPointContainer, (void**)&this->_pIConnectionPointContainer);

      //hResult =  _pIOPCItemMgt->QueryInterface(&_pIConnectionPointContainer);
      if (FAILED(hResult))  {
          qDebug()<<"1009: IConnectionPointContainer 创建失败!";
          DisConnect();
        }
      hResult = _pIConnectionPointContainer->FindConnectionPoint( IID_IOPCDataCallback, &_pIConnectionPoint );
      if( FAILED(hResult) || _pIConnectionPoint == NULL) {
          qDebug()<< "1010: A group of OPC with no IOPCDataCallback. OPC server appears to not conform to the OPC DA 2.0 standard (%s).";
          DisConnect();
        }
      if( m_OPCDataCallback == NULL ) {

          if(!m_COPCTransaction){
              m_COPCTransaction = new COPCTransaction;
            }
          m_OPCDataCallback = new COPCDataCallback(m_COPCTransaction);
          m_OPCDataCallback->AddRef();
          // m_OPCDataCallback->receiver = m_DataReceiver;
        }
      hResult = _pIConnectionPoint->Advise(m_OPCDataCallback, &m_Cookie);
      qDebug()<< hResult;
      if(FAILED(hResult)) {
          qDebug()<< "1011: OPCDataCallback set faild." << m_Cookie;
          _pIConnectionPointContainer->Release();
          DisConnect();
        }
      isWriteAble = true;
    }else{
      hResult = _pIOPCItemMgt->QueryInterface(IID_IOPCSyncIO, (void**)&this->_pIOPCSyncIO);
      if (FAILED(hResult))  {
          qDebug()<<"1007: IOPCSyncIO 没有发现，错误的查询!";
          DisConnect();
        }
      isWriteAble = true;
    }

  return hResult;
}

/**
 * 添加监视项
 * @brief OPCClient::AddItems
 * @param inames
 * @return
 */
QStringList OPCClient::AddItems(QStringList inames)
{
  QStringList r_inames;

  if(!_pIOPCItemMgt) return r_inames;

  pErrors = NULL;
  DWORD iCount=items->count();
  OPCITEMRESULT * pResults;
  qDebug()<<"1--- begin add item -----------";
  for(int i=0;i<inames.count();i++) {
      QString iname = inames[i];
      if(getItemByName(iname)){
          qDebug() << "    already exsits."<< iname;
          continue;
        }
      r_inames.append(iname);
    }
  int nCount=r_inames.count();
  if(nCount>0){
      OPCITEMDEF idef[nCount];
      for(int i=0;i<nCount;i++) {
          QString iname = r_inames[i];
          qDebug()<< "    build item def"<< iname;
          idef[i].szAccessPath= SysAllocString(L"");           // path SysAllocString(qstr2Wstr(name))
          idef[i].szItemID    = SysAllocString(qstr2Wstr(iname));       // name
          idef[i].bActive     = TRUE;
          idef[i].hClient     = iCount+i;
          idef[i].dwBlobSize  = 0;
          idef[i].pBlob       = NULL;
          idef[i].vtRequestedDataType = 0;
        }
      qDebug()<<"2--- end of add item-----------";

      hResult = _pIOPCItemMgt->AddItems(nCount,  // [in] add items
                                        idef,        // [in] see above
                                        &pResults,   // [out] array with additional information about the item
                                        &pErrors);   // [out] tells which of the items was successfully added.

      if(hResult==S_OK && hResult!=S_FALSE){
          for(int i=0;i < nCount; i++) {
              QString iname = r_inames[i];
              DWORD cItemHandle = iCount+i;
              ItemDef *item = new ItemDef;
              item->name = iname;
              item->accessRights = pResults[i].dwAccessRights;
              item->hClientHandle = cItemHandle;
              item->type = pResults[i].vtCanonicalDataType;
              item->hServerHandle = pResults[i].hServer;
              items->append(item);
              //    检测 Item 的可读写性
              //            if (pResults[i].dwAccessRights != (OPC_READABLE +  OPC_WRITEABLE))   {
              //                qDebug()<<"Item 不可读，也不可写,请检查服务器配置";
              //              }
            }
        }

     if(pResults) CoTaskMemFree( pResults );
      if(pErrors)  CoTaskMemFree( pErrors );
      ClearOPCITEMDEF(idef, nCount);
    }
   return r_inames;
}
/**
 * 同步读取指定项
 * @brief OPCClient::ReadItem
 * @param item
 * @return
 */
bool OPCClient::ReadItem(ItemDef *item)
{
  bool result = false;
  OPCITEMSTATE *pItemValue;
  hResult = _pIOPCSyncIO->Read(OPC_DS_DEVICE, 1, &item->hServerHandle,  &pItemValue, &pErrors);

  if(SUCCEEDED(hResult)){
      item->value = pItemValue[0].vDataValue;
      item->quality = pItemValue[0].wQuality;
      item->time = pItemValue[0].ftTimeStamp;
      item->hClientHandle = pItemValue[0].hClient;
      result = true;
      VariantClear(&pItemValue->vDataValue);
    }else{
      qDebug()<< "同步读取项目失败" << hResult;
    }

  CoTaskMemFree(pErrors);
  CoTaskMemFree(pItemValue);

  return result;
}
/**
 * 写入值
 * @brief OPCClient::WriteValue
 * @param cHandle
 * @param time
 * @param value
 * @param Quality
 * @return
 */
bool OPCClient::WriteValue( DWORD cHandle, FILETIME &time, VARIANT &value, WORD Quality )
{
    ItemDef * item = getItemByHandle( cHandle );
    if( !item )
        return false;

    item->quality = Quality;
    item->value = value;
    item->time = time;

    if( m_Async )
        return SUCCEEDED( WriteValue_Async(item) );
    else
        return SUCCEEDED( WriteValue_Sync( item ) );
}
bool OPCClient::WriteValue(QString &n, QString &v )
{
    ItemDef * item = getItemByName(n);
    if(!item )
        return false;
    StringVariant(item, v);
    if( m_Async )
        return SUCCEEDED( WriteValue_Async(item) );
    else
        return SUCCEEDED( WriteValue_Sync( item ) );
}
HRESULT OPCClient::WriteValue_Async(ItemDef * item)
{
          QString str;
          pErrors    = NULL;
          if( m_COPCTransaction == NULL ) return E_FAIL;
          if( !isConnected() ) return E_FAIL;

         // m_Group->QueryInterface( &AsyncIO );
          if( _pIOPCAsyncIO2 == NULL ) {
                  qDebug()<< "Failed to get interface IOPCAsyncIO2";
                  return E_FAIL;
          }
          DWORD cancelID = 0;

          hResult = _pIOPCAsyncIO2->Write( 1, &item->hServerHandle, &item->value, rand(), &cancelID, &pErrors);
          if( FAILED(hResult) /*|| FAILED(pErrors[0])*/) {
                  qDebug()<< "Parameter [%s] is not passed" << item->name;
                  hResult = E_FAIL;

          }
          if( pErrors )
          {
                  switch( pErrors[0] ) {
                          case OPC_S_CLAMP:
                                  qDebug()<< "AsyncIO->Write(%s) -> [OPC_S_CLAMP] The value was accepted but was clamped."<<item->name;
                                  break;
                          case OPC_E_RANGE: qDebug()<< "AsyncIO->Write(%s) -> [OPC_E_RANGE] The value was out of range."<<item->name;
                                  break;
                          case OPC_E_BADTYPE:
                                  str=QString("AsyncIO->Write(%1) -> [OPC_E_BADTYPE] The passed data type (%2) cannot be accepted for this item.").arg(item->name, item->value.vt);
                                  qDebug()<< str;
                                  break;
                          case OPC_E_BADRIGHTS:
                                  qDebug()<< "AsyncIO->Write(%s) -> [OPC_E_BADRIGHTS] The item is not writeable."<<item->name;
                                  break;
                          case OPC_E_INVALIDHANDLE:
                                  qDebug()<< "AsyncIO->Write(%s) -> [OPC_E_INVALIDHANDLE] The passed item handle was invalid."<<item->name;
                                  break;
                          case OPC_E_UNKNOWNITEMID:
                                  qDebug()<< "AsyncIO->Write(%s) -> [OPC_E_UNKNOWNITEMID] The item is no longer available in the server address space."<<item->name;
                                  break;
                  }

          }
          if( pErrors )CoTaskMemFree( pErrors );
          return hResult;

}

HRESULT OPCClient::WriteValue_Sync( ItemDef * item )
{
  pErrors    = NULL;
  if( m_COPCTransaction == NULL ) return E_FAIL;
  if( !isConnected() ) return E_FAIL;

        qDebug() << "Sync Write start (hdl="<< item->hServerHandle << ") value=" << VariantString(item->value);

        hResult = _pIOPCSyncIO->Write( 1, &item->hServerHandle, &item->value, &pErrors);

        qDebug() << "Sync Write finished. hr = " << hResult;

    if( FAILED(hResult) /*|| FAILED(pErrors[0])*/) {
        qDebug() << "Parameter [%s] is not passed"<<item->name;
        hResult = E_FAIL;

        if( pErrors != NULL)
        {
            switch( pErrors[0] ) {
            case OPC_S_CLAMP:
                qDebug() << "SyncIO->Write(%s) -> [OPC_S_CLAMP] The value was accepted but was clamped." << item->name ;
                break;
            case OPC_E_RANGE:
                qDebug() << "SyncIO->Write(%s) -> [OPC_E_RANGE] The value was out of range."<<item->name  ;
                break;
            case OPC_E_BADTYPE:
                qDebug() << "SyncIO->Write(%s) -> [OPC_E_BADTYPE] The passed data type cannot be accepted for this item."<<item->name ;
                break;
            case OPC_E_BADRIGHTS:
                qDebug() << "SyncIO->Write(%s) -> [OPC_E_BADRIGHTS] The item is not writeable."<<item->name ;
                break;
            case OPC_E_INVALIDHANDLE:
                qDebug() << "SyncIO->Write(%s) -> [OPC_E_INVALIDHANDLE] The passed item handle was invalid."<<item->name ;
                break;
            case OPC_E_UNKNOWNITEMID:
                qDebug() << "SyncIO->Write(%s) -> [OPC_E_UNKNOWNITEMID] The item is no longer available in the server address space."<<item->name ;
                break;
            }
        }
    }

    if( pErrors )
        CoTaskMemFree( pErrors );

    return hResult;
}

/**
 * 移除所有项目
 * @brief OPCClient::RemoveItems
 * @param _items
 * @return
 */
HRESULT OPCClient::RemoveItems(QStringList inames)
{
  int _iCount = inames.count();
  if( _iCount==0) return -1;
  OPCHANDLE _hpSvr[_iCount];
  for(int i=0;i<_iCount ;i++){
      if(getItemByName(inames.value(i))){
          _hpSvr[i] = getItemByName(inames.at(i))->hServerHandle;
        }

    }

  hResult = _pIOPCItemMgt->RemoveItems(_iCount, _hpSvr, &pErrors);
  if(SUCCEEDED(hResult)){
      for(int i=0;i<_iCount ;i++){
          items->removeAll(getItemByName(inames.at(i)));;
        }
    }

  return hResult;
}
/**
 * @brief OPCClient::RemoveAllItems
 * @return
 */
HRESULT OPCClient::RemoveAllItems()
{
  int _iCount = items->count();
  OPCHANDLE _hpSvr[_iCount];
  qDebug()<<"3---begin delete-----------";
  for(int i=0;i<_iCount ;i++){
      qDebug() <<"    next one->"<< items->at(i)->hServerHandle << items->at(i)->name;
      _hpSvr[i] = items->at(i)->hServerHandle;
    }

  hResult = _pIOPCItemMgt->RemoveItems(_iCount, _hpSvr, &pErrors);
  qDebug() <<"4---end delete-----------" << hResult;
  if(SUCCEEDED(hResult)){
      while(items->count()!=0){
          items->removeAt(0);
        }
    }
  return hResult;
}
/**
 * 断开连接
 * @brief OPCClient::DisConnect
 */
void OPCClient::DisConnect()
{
  if(_pIOPCSyncIO){
      _pIOPCSyncIO->Release();
      _pIOPCSyncIO=0;
    }
  if (_pIConnectionPoint)
    {
      _pIConnectionPoint->Unadvise(m_Cookie);
      _pIConnectionPoint->Release();
      _pIConnectionPoint = 0;
    }
  if(_pIOPCItemMgt){
      _pIOPCItemMgt->Release();
      _pIOPCItemMgt = 0;
    }
  if(_pIOPCGroupStateMgt){
      _pIOPCGroupStateMgt->Release();
      _pIOPCGroupStateMgt = 0;
    }
  if(_pIOPCServer){
      _pIOPCServer->RemoveGroup(m_GroupHandle, TRUE);
      _pIOPCServer->Release();
      _pIOPCServer=0;
    }
  if(m_OPCDataCallback){
      m_OPCDataCallback->Release();
      m_OPCDataCallback = 0;
    }
  if(m_COPCTransaction){
      m_COPCTransaction->deleteLater();
      m_COPCTransaction = 0;
    }

  m_GroupHandle = 0;
  m_ServerHandle = 0;
  CoUninitialize();
  delete items;
}

void OPCClient::dataCallback()
{


  //  // 建立异步回调
  //  CComObject<COPCDataCallback>* pCOPCDataCallback;
  //  // 回调对象的指针
  //  // 通过 ATL 模板创建回调对象的实例
  //  CComObject<COPCDataCallback>::CreateInstance(&pCOPCD ataCallback);
  //  // 查询 IUnknown 接口
  //  LPUNKNOWN pCbUnk;
  //  pCbUnk = pCOPCDataCallback->GetUnknown();
  //  // 建立一个服务器的连接点与客户程序接收器之间的连接
  //  HRESULT hRes = AtlAdvise( m_IOPCGroupStateMgt, // [in]  //连接点的 IUnknown 接口
  //                            pCbUnk, // [in] 回调对象的 IUnknown 接口
  //                            IID_IOPCDataCallback,// [in] 连接点 ID
  //                            &m_dwAdvise    // [out] 唯一的标识符
  //                            );
  //    if (hRes != S_OK)    {
  //        AfxMessageBox("Advise 失败!");
  //      }
}

/**
 * 连接状态
 * @brief OPCClient::isConnected
 * @return
 */
bool OPCClient::isConnected()
{
  return ( _pIOPCServer && _pIOPCGroupStateMgt );
}

void OPCClient::ClearOPCITEMDEF( OPCITEMDEF *idef, int count )
{
  if( idef )
    for(int i=0;i<count;i++)
      {
        if( idef[i].szItemID != NULL )
          SysFreeString( idef[i].szItemID );
        if( idef[i].szAccessPath != NULL )
          SysFreeString( idef[i].szAccessPath );
      }
}
/**
 * 获取ItemDef by name
 * @brief OPCClient::getItemByName
 * @param s
 * @return
 */
ItemDef* OPCClient::getItemByName(QString s)
{
  int c = items->count();

  for(int i=0; i<c; i++) {
      if(items->at(i)->name == s){
          return items->at(i);
        }
    }
  return 0;
}
/**
 * 获取ItemDef by Handle
 * @brief OPCClient::getItemByHandle
 * @param s
 * @return
 */
ItemDef* OPCClient::getItemByHandle(DWORD h)
{
  int c = items->count();

  for(int i=0; i<c; i++) {
      if(items->at(i)->hClientHandle == h){
          return items->at(i);
        }
    }
  return 0;
}
/**
 * 析构函数
 * @brief OPCClient::~OPCClient
 */
OPCClient::~OPCClient()
{
  DisConnect();
}
//////////////////////////////////////////////////

/**
 * QString 转换为 const wchar*
 * @brief OPCClient::qstr2Wstr
 * @param s
 * @return
 */
WString OPCClient::qstr2Wstr(QString s)
{
  return reinterpret_cast<const wchar_t*>(s.utf16());
  //wchar_t* tempWide = const_cast< wchar_t* >( tempConstWide );
}
/**
 * 输出项目值字符串
 * @brief OPCClient::VariantString
 * @param pValue
 * @return
 */
QString OPCClient::VariantString(VARIANT &pValue)
{
  QString valueString;
  //qDebug()<< QString(" Format type:%1 ").arg(pValue.vt);
  switch(pValue.vt)
    {
    case VT_I1:
    case VT_UI1:        // BYTE
      {
        int i = pValue.iVal;
        valueString= QString::number(i);
        break;
      }
    case VT_I2:            // SHORT
      valueString= QString::number(pValue.iVal);
      break;
    case VT_UI2:        // UNSIGNED SHORT
      valueString= QString::number(pValue.uiVal);

      break;
    case VT_I4:            // LONG
      valueString= QString::number(pValue.lVal);
      break;
    case VT_UI4:        // UNSIGNED LONG
      valueString= QString::number(pValue.ulVal);
      break;
    case VT_INT:        // INTEGER
      valueString= QString::number(pValue.intVal);
      break;
    case VT_UINT:        // UNSIGNED INTEGER
      valueString= QString::number(pValue.uintVal);

      break;
    case VT_R4:            // FLOAT
      //sprintf    (buf, "%5.2f ", pValue.fltVal );
      valueString= QString::number(pValue.fltVal);
      break;
    case VT_R8:            // DOUBLE
      //sprintf    (buf, "%9.4f ", pValue.dblVal );
      valueString= QString::number(pValue.dblVal);
      break;
    case VT_BSTR:        //BSTR
      {
        //sprintf    (buf, "%ls ", pValue.bstrVal );
        BSTR bstr_str = pValue.bstrVal;
        QString q_str((QChar*)bstr_str, wcslen(bstr_str));
        valueString = q_str;

        break;
      }
    case VT_BOOL:
      {
        if (pValue.boolVal)
          valueString = "TRUE";
        else
          valueString = "FALSE";
        break;
      }
    case VT_DATE:
      {
        QDateTime dt;
        //qDebug()<< pValue.date;
        dt.fromMSecsSinceEpoch(pValue.date);
        valueString =  dt.toString("yyyy-MM-dd hh:mm:ss");
        break;
      }
    default:
      valueString = QString(" unknown type:%1 ").arg(pValue.vt);
      break;
    }
  return valueString;
}
/**
 * 输出项目值质量字符串
 * @brief OPCClient::VariantString
 * @param pValue
 * @return
 */
QString OPCClient::QualityString(UINT qnr)
{
  QString result;
  switch(qnr)   {
    case OPC_QUALITY_BAD:
      result = "BAD";
      break;
    case OPC_QUALITY_UNCERTAIN:
      result= "UNCERTAIN";
      break;
    case OPC_QUALITY_GOOD:
      result = "GOOD";
      break;
    case OPC_QUALITY_NOT_CONNECTED:
      result = "NOT_CONNECTED";
      break;
    case OPC_QUALITY_DEVICE_FAILURE:
      result = "DEVICE_FAILURE";
      break;
    case OPC_QUALITY_SENSOR_FAILURE:
      result = "SENSOR_FAILURE";
      break;
    case OPC_QUALITY_LAST_KNOWN:
      result = "LAST_KNOWN";
      break;
    case OPC_QUALITY_COMM_FAILURE:
      result = "COMM_FAILURE";
      break;
    case OPC_QUALITY_OUT_OF_SERVICE:
      result = "OUT_OF_SERVICE";
      break;
    case OPC_QUALITY_LAST_USABLE:
      result = "LAST_USABLE";
      break;
    case OPC_QUALITY_SENSOR_CAL:
      result = "SENSOR_CAL";
      break;
    case OPC_QUALITY_EGU_EXCEEDED:
      result = "EGU_EXCEEDED";
      break; case OPC_QUALITY_SUB_NORMAL:
      result = "SUB_NORMAL";
      break;
    case OPC_QUALITY_LOCAL_OVERRIDE:
      result = "LOCAL_OVERRIDE";
      break;
    default:
      result = "UNKNOWN ERROR";
    }
  return result;
}
/**
 * 输出值类型字符串
 * @brief OPCClient::ValueTypeString
 * @param v
 * @return
 */
QString OPCClient::ValueTypeString(const VARTYPE& v)
{
  QString str;

  switch(v) {
    case VT_BSTR:
      str = QString("VT_BSTR");
      break;
    case VT_I1:
      str = QString("VT_I1");
      break;
    case VT_I2:
      str = QString("VT_I2");
      break;
    case VT_I4:
      str = QString("VT_I4");
      break;
    case VT_I8:
      str = QString("VT_I8");
      break;
    case VT_R4:
      str = QString("VT_R4");
      break;
    case VT_R8:
      str = QString("VT_R8");
      break;
    case VT_UI1:
      str = QString("VT_UI1");
      break;
    case VT_UI2:
      str = QString("VT_UI2");
      break;
    case VT_UI4:
      str = QString("VT_UI4");
      break;
    case VT_UI8:
      str = QString("VT_UI8");
      break;
    case VT_INT:
      str = QString("VT_INT");
      break;
    case VT_UINT:
      str = QString("VT_UINT");
      break;
    case VT_BOOL:
      str = QString("VT_BOOL");
      break;
    case VT_DATE:
      str = QString("VT_DATE");
      break;
    default:
      str = QString("unknown");
      break;
    };
  return str;
}
/**
 * 赋值
 * @brief OPCClient::StringVariant
 * @param item
 * @param v
 * @return
 */
void OPCClient::StringVariant(ItemDef* item, QString v)
{
  switch (item->value.vt)
    {
    case VT_UI1:
    case VT_I1:
        //cbRead = sizeof(BYTE);
        break;
    case VT_I2:
    case VT_UI2:
    case VT_BOOL:
        item->value.iVal = v.toShort();
        break;
    case VT_I4:
    case VT_UI4:
    case VT_INT:
    case VT_UINT:
    case VT_ERROR:
      item->value.lVal = v.toLong();
      break;
    case VT_R4:
      item->value.fltVal = v.toFloat();
      break;
    case VT_I8:
    case VT_UI8:
      item->value.llVal = v.toLongLong();
        break;
    case VT_R8:
    case VT_CY:
    case VT_DATE:
      item->value.dblVal = v.toDouble();
        break;
    case VT_BSTR:
      {
        //Value.bstrVal =  SysAllocString(v.utf16());
        //Value.bstrVal = qstringToBstr(v);
        wchar_t *pW = new wchar_t[v.size()+1];
        v.toWCharArray(pW);
        //dialog.m_valueValue.bstrVal = SysAllocString(dialog.m_value.toStdWString().c_str());
        break;
      }
    default:
      break;
    }

  return;
}
/**
 * 输出权限字符串
 * @brief OPCClient::AccessTypeString
 * @param accessIdent
 * @return
 */
QString OPCClient::AccessTypeString(qint16 accessIdent)
{
  QString s;
  switch(accessIdent){
    case OPC_READABLE:
      s = "Read";
      break;
    case OPC_WRITEABLE:
      s = "Write";
      break;
    default:
      s = "Read/Write";
    }
  return s;
}
QString OPCClient::TimeString(FILETIME t)
{
  return QString::number(t.dwLowDateTime);
}