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using System;
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using OPC;
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using OPCDA;
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using OPCDA.NET;
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using System.Runtime.InteropServices;
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namespace Mesnac.Basic
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{
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// 定义用于返回发生变化的项的值和其对应的客户句柄
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public delegate void DataChange(READRESULT[] values, string[] itemsID);
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/// <summary>
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/// 自定义的结构
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/// 用来保存读取到的数据（值，品质，时间戳）
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/// </summary>
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public struct READRESULT
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{
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public string readValue;
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public string readQuality;
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public string readTimeStamp;
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}
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public class OPCComm
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{
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OpcServer myOPCServer;//server object
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SyncIOGroup readWriteGroup;//group object
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ItemDef itemData;
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BrowseTree itemTree;
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READRESULT readRes;
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//供回调函数使用
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RefreshGroup asyncRefrGroup;
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DataChangeEventHandler dch;
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READRESULT[] dataChangeRes; //用来保存变量值发生变化时服务器的回调函数得到的变量数据
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public READRESULT[] DataChangeRes
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{
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get { return dataChangeRes; }
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set { dataChangeRes = value; }
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}
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public BrowseTree ItemTree
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{
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get { return itemTree; }
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set { itemTree = value; }
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}
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public ItemDef ItemData
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{
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get { return itemData; }
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set { itemData = value; }
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}
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internal READRESULT ReadRes
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{
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get { return readRes; }
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set { readRes = value; }
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}
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DataChange dtChange;
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public OPCComm(DataChange dataChange)
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{
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dtChange = dataChange;
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}
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#region 获得可访问的服务器名字列表
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/// <summary>
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/// 获得服务器名字列表
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/// </summary>
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/// <returns>返回包含服务器名字的字符串数组</returns>
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public string[] GetSerList(string host)
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{
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OpcServerBrowser serList = new OpcServerBrowser(new OPC.Common.Host(host));
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string[] serNames;
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serList.GetServerList(out serNames);
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return serNames;
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}
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#endregion
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#region 浏览服务器地址空间
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/// <summary>
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/// 浏览服务器地址空间
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/// </summary>
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/// <returns>成功返回0， 失败返回-1</returns>
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public int GetItemList()
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{
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itemTree = new BrowseTree(myOPCServer);
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int res = itemTree.CreateTree(); // Browse server from root
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if (HRESULTS.Succeeded(res))
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{
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return 0;
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}
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return -1;
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}
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#endregion
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#region 连接服务器
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/// <summary>
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/// 连接服务器
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/// </summary>
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/// <param name="serName">服务器的名字</param>
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/// <param name="serIP">服务器所在机器的IP</param>
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/// <returns>成功返回0，失败返回-1</returns>
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public int Conn2Server(string serName, string serIP,int refresh)
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{
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int res;
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try
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{
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myOPCServer = new OpcServer();
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res = myOPCServer.Connect(serIP, serName);
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if (HRESULTS.Failed(res))
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{
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myOPCServer = null;
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return -1;
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}
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readWriteGroup = new SyncIOGroup(myOPCServer);
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//供回调函数刷新变量值使用
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dch = new DataChangeEventHandler(DataChangeHandler);
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if (refresh<=0)
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{
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refresh = 1000;
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}
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asyncRefrGroup = new RefreshGroup(myOPCServer, dch, refresh);
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}
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catch
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{
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myOPCServer = null;
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return -1;
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}
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return 0;
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}
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#endregion
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#region 添加项
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/// <summary>
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/// 获得变量对象
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/// </summary>
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/// <param name="itemId">变量ID</param>
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/// <returns>成功返回0， 失败返回-1</returns>
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int AddItem(string itemId)
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{
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itemData = readWriteGroup.Item(itemId);
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if (itemData == null)
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{
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readWriteGroup.Add(itemId);
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itemData = readWriteGroup.Item(itemId);
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if (itemData == null)
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{
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return -1;
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}
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}
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return 0;
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}
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#endregion
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#region 读取一个变量
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/// <summary>
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/// 从服务器上读取数据,读取的数据保存在READRESULT结构中
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/// </summary>
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/// <param name="num">变量ID</param>
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/// <returns>成功返回0， 失败返回-1</returns>
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public int Read(string itemId)
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{
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if (AddItem(itemId) == 0)
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{
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OPCItemState Rslt;
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OPCDATASOURCE dsrc = OPCDATASOURCE.OPC_DS_DEVICE;
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int rtc = readWriteGroup.Read(dsrc, itemData, out Rslt);
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if (HRESULTS.Succeeded(rtc)) // read from OPC server successful
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{
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if (Rslt != null)
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{
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if (HRESULTS.Succeeded(Rslt.Error)) // item read successful
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{
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readRes.readValue = Rslt.DataValue.ToString();
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readRes.readQuality = readWriteGroup.GetQualityString(Rslt.Quality);
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DateTime dt = DateTime.FromFileTime(Rslt.TimeStamp);
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readRes.readTimeStamp = dt.ToString();
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return 0;
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}
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return -1;
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}
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return -1;
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}
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else
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{
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return -1;
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}
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}
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return -1;
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}
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#endregion
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#region 修改一个变量
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/// <summary>
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/// 修改一个变量
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/// </summary>
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/// <param name="itemId">变量ID</param>
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/// <param name="value">变量的值</param>
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/// <returns>返回写操作结果的字符串</returns>
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public string Write(string itemId, object value)
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{
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if (AddItem(itemId) == 0)
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{
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int res = readWriteGroup.Write(itemData, value);
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return readWriteGroup.GetErrorString(res);
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}
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return null;
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}
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#endregion
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#region 向RefreshGroup组中添加一个变量
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/// <summary>
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/// 向RefreshGroup组中添加一个变量
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/// </summary>
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/// <param name="itemId">变量ID</param>
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/// <returns>成功返回0，失败返回-1</returns>
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public int Add2RefrGroup2(string itemId,ref VarEnum DataType)
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{
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DataType = VarEnum.VT_EMPTY;
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if (AddItem(itemId) == 0)
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{
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DataType = itemData.OpcIInfo.CanonicalDataType;
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int res = asyncRefrGroup.Add(itemData.OpcIDef.ItemID);
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if (HRESULTS.Failed(res))
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{
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return -1;
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}
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return 0;
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}
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return -1;
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}
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public int Add2RefrGroup(string itemId)
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{
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if (AddItem(itemId) == 0)
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{
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int res = asyncRefrGroup.Add(itemData.OpcIDef.ItemID);
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if (HRESULTS.Failed(res))
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{
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return -1;
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}
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return 0;
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}
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return -1;
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}
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#endregion
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#region 断开同服务器的连接
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/// <summary>
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/// 断开同服务器的连接
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/// </summary>
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/// <returns>成功返回0，失败返回-1</returns>
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public void DisConn()
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{
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if (myOPCServer != null)
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{
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asyncRefrGroup.Dispose();
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readWriteGroup.Dispose();
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myOPCServer.Disconnect();
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myOPCServer = null;
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}
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}
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#endregion
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#region 回调函数
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/// <summary>
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/// 回调函数，当RefreshGroup组里的数据发生变化时由服务器自动调用该函数
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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public void DataChangeHandler(object sender, DataChangeEventArgs e)
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{
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int count = e.sts.Length;
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string[] itemsID = new string[count];
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dataChangeRes = new READRESULT[count];
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for (int i = 0; i < count; ++i)
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{
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int hnd = e.sts[i].HandleClient;
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ItemDef item = asyncRefrGroup.FindClientHandle(hnd);
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if (item != null)
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{
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//保存变量的ItemID
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itemsID[i] = item.OpcIDef.ItemID;
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}
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object val = e.sts[i].DataValue;
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string qt = asyncRefrGroup.GetQualityString(e.sts[i].Quality);
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DateTime dt = DateTime.FromFileTime(e.sts[i].TimeStamp);
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//将变量的值保存在READRESULT结构中
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dataChangeRes[i].readValue = val.ToString();
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dataChangeRes[i].readQuality = qt;
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dataChangeRes[i].readTimeStamp = dt.ToString();
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}
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dtChange(dataChangeRes, itemsID);
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}
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#endregion
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}
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}
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