OPC core components 介绍及下载

Proxy/stub:  

OPC Proxy Stub下载

OpcDaAuto.dll	OPC Data Access Automation Wrapper
Opcproxy.dll	OPC Data Access 3.00 Proxy/Stub
OpcComn_ps.dll	OPC Common 1.10 Proxy/Stub
Opc_aeps.dll	OPC Alarms & Events 1.10 Proxy/Stub
Opchda_ps.dll	OPC Historial Data Access 1.20 Proxy/Stub
opcEnum.exe	OPC Server Enumerator 1.10

   

.NET wrapper: 

OpcRcw下载

OpcRcw.Da.dll	OPC Data Access 3.00 .NET Wrapper
OpcRcw.Ae.dll	OPC Alarms & Events 1.10 .NET Wrapper
OpcRcw.Hda.dll	OPC Historial Data Access 1.20 .NET Wrapper
OpcRcw.Comn.dll	OPC Common 1.10 .NET Wrapper
OpcRcw.Batch.dll	OPC batch custom 2.0 .NET Wrapper
OpcRcw.Dx.dll	OPC Data eXchange 1.0 .NET Wrapper

   

Include files:

Opc Include files下载

   

Opcda.idl

Opcda.h

Opcda_i.c

Opcerror.h

Opccomn.idl

Opccomn.h

Opccomn_i.c

 

OpcProxy.dll如何生成的

工程文件：

 

Opcda.idl: 接口定义文件;

opcda.h, opcda_i.c, opcda_p.c, dlldata.c都是有opcda.idl编译生成;

Opcerror.h: opc da 错误代码定义;

Opcerror.mc: opc da 错误代码对应的文本描述，格式如下：

MessageID=0x0006

Severity=Error

Facility=Interface

SymbolicName=OPC_E_BADRIGHTS

Language=English

The item's access rights do not allow the operation.

 

OpcEnum.exe

是一个Windows 服务程序，通过DCOM方式，让client获得远程机器上有哪些OPC server可以访问。OpcEnum实现IOPCServerList接口，该接口定义如下：

 

interface IOPCServerList : IUnknown
{
    HRESULT EnumClassesOfCategories(
        [in]                       ULONG        cImplemented,
        [in,size_is(cImplemented)] CATID        rgcatidImpl[],
        [in]                       ULONG        cRequired,
        [in,size_is(cRequired)]    CATID        rgcatidReq[],
        [out]                      IEnumGUID ** ppenumClsid
    );

    HRESULT GetClassDetails(
        [in]  REFCLSID  clsid, 
        [out] LPOLESTR* ppszProgID, 
        [out] LPOLESTR* ppszUserType
    );

    HRESULT CLSIDFromProgID(
        [in]  LPCOLESTR szProgId, 
        [out] LPCLSID   clsid
    );
};

 

 

Opc Client可以通过如下方式枚举远程OPC server：

  HRESULT hr = S_OK;
  MULTI_QI mqi;
  COSERVERINFO sin;
  CComPtr<IOPCServerList> spServerList = NULL;

  WCHAR wszNodeName[256];
  memset( wszNodeName, 0, 256 );

  // remote node name
  //wcscpy(wszNodeName, L"RemoteComputerName");

  // create opc server list object
  if( wcslen(wszNodeName) <= 0 )
  {
    // local server enumerate
    hr = CoCreateInstance( CLSID_OPCServerList, NULL, CLSCTX_ALL, 
                           __uuidof( IOPCServerList), (LPVOID *) &spServerList );
    if( FAILED( hr ) )
    {
      TRACE( L"Error: Could not load local OPC Server Enumerator Object" );
      return;
    }
  }
  else
  {
    sin.dwReserved1 = 0;
    sin.dwReserved2 = 0;
    sin.pwszName = wszNodeName;
    sin.pAuthInfo = NULL;

    mqi.pIID = &__uuidof(IOPCServerList);
    mqi.hr = 0;
    mqi.pItf = 0;

    hr = CoCreateInstanceEx( CLSID_OPCServerList, NULL, CLSCTX_REMOTE_SERVER, &sin, 1, &mqi );
    if( FAILED(hr) || FAILED(mqi.hr) )
    {
      TRACE( L"Error: Could not load OPC Server Enumerator Object" );
      return;
    }

    spServerList = (IOPCServerList *) mqi.pItf;
  }

  // enumerate server list
  IEnumGUID *pEnumGUID = NULL;
  CLSID clsId;
  DWORD count;
  LPOLESTR szProgId, szUserType;
  CLSID catId = CATID_OPCDAServer20;

  hr = spServerList->EnumClassesOfCategories( 1, &catId, 1, &catId, &pEnumGUID );
  if( FAILED( hr ) )
    return;

  while( SUCCEEDED( pEnumGUID->Next( 1, &clsId, &count ) ) )
  {
    hr = spServerList->GetClassDetails( clsId, &szProgId, &szUserType );
    if( FAILED( hr ) )
      return;

    // do your own things with zProgId
    // TODO

    // probably want to save the class id in the item data field for this entry.
    CoTaskMemFree( szProgId );
    CoTaskMemFree( szUserType );
  }