基于C#的PISDK研究(代码)

本篇文章主要利用PISDK从PI服务器取数，介绍多种取数方法。

首先需要一些基础的代码，比如获取PI服务的：

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/// <summary> /// 获取PI服务/// </summary> /// <param name="servername">//UID=PIUser;PWD=PIUserPassWord </param> /// <returns></returns> private Server GetServer(string servername) {     try     {         if (!string.IsNullOrEmpty(servername))         {             //采用认证方式登录             server = pi.Servers[servername];             server.Open(connStr);         }         else         {             //采用默认方式登录             server = pi.Servers.DefaultServer;             server.Open();         }            if (server.Connected)         {             return server;         }         else         {             return null;         }     }     catch (Exception ex)     {         MessageBox.Show(ex.Message);         return null;     } }

　　还有到PI服务器中找点的方法：

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/// <summary> /// 搜索PI中对应的数据点 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="condition">选择tag的条件</param> /// <returns></returns> private PointList SearchPIPoints(Server server, String condition) {       return server.GetPoints(condition); }

　　

下面介绍取数方法：

1. 取得单个tag快照值

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/// <summary> /// 取得单个tag快照值 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="tag">tag名称</param> /// <returns></returns> private string GetSingleSnap(Server server, string tag) {     string output=string.Empty;     PIPoints piPoints = server.PIPoints;     //采用标签名称的方式取得对象     PIPoint piPoint = piPoints[tag];     //调用方法取得快照值     PIValue piValue = piPoint.Data.Snapshot;     //取到该快照值时PI服务器时间     PITimeServer.PITime piTime = piValue.TimeStamp;     output = piTime.LocalDate.ToString() + " " + piValue.Value + Environment.NewLine;     return output; }

　　2. 取得单个tag一段时间内的历史值

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/// <summary> /// 取得单个tag段时间内的历史值 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="tag">tag名称</param> /// <returns></returns> private string GetSingleHistory(Server server, string tag) {     string output = string.Empty;     PIPoints piPoints = server.PIPoints;     PIPoint piPoint = piPoints[tag];     //取得分钟前到当前时间的历史值     PIValues piValues = piPoint.Data.RecordedValues(DateTime.Now.AddMinutes(-5).ToString(),         DateTime.Now.ToString());     foreach (PIValue piValue in piValues)     {         PITimeServer.PITime piTime = piValue.TimeStamp; //PI时间         output += piTime.LocalDate.ToString() + " " + piValue.Value + Environment.NewLine;     }     return output; }

　　3. 取得多个tag快照值

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/// <summary> /// 取得多个tag取快照值 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="tag">tag值(tag='' or tag='')</param> /// <returns></returns> private string MultipleSnap(Server server, string tag) {     string output = string.Empty;     //取tag     PointList ptlist = SearchPIPoints(server, tag);     PISDKCommon.NamedValues nvErrs = new PISDKCommon.NamedValues();     PointValues ptvalues = ptlist.Data.get_Snapshot(out nvErrs);        foreach (PointValue myValue in ptvalues)     {         PITimeServer.PITime piTime = myValue.PIValue.TimeStamp; //PI时间         if (myValue.PIValue.Value.GetType().IsCOMObject)         {             //状态值             DigitalState myDigState = (DigitalState)myValue.PIValue.Value;             output += myValue.PIPoint.Name + " " + piTime.LocalDate.ToString() + " " + myDigState.Name + Environment.NewLine;         }         else         {             //模拟值             output += myValue.PIPoint.Name + " " + piTime.LocalDate.ToString() + " " + Convert.ToString(Math.Round(double.Parse(Convert.ToString(myValue.PIValue.Value)), 2)) + Environment.NewLine;         }     }     return output; }

　　4. 取得多个tag一段历史时间所有值

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/// <summary> /// 取得多个tag段历史时间所有值 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="tag">tag名称</param> /// <returns></returns> private string MultipleHistory1(Server server,string tag) {     string output = string.Empty;     PointList ptlist = SearchPIPoints(server, tag);     string outPut = string.Empty;        PISDKCommon.NamedValues nvErrs = new PISDKCommon.NamedValues();        foreach (PIPoint piPoint in ptlist)     {         //获取5分钟前到当前时间的历史值         PIValues piValues = piPoint.Data.RecordedValues(DateTime.Now.AddMinutes(-5).ToString(),         DateTime.Now.ToString());            foreach (PIValue piValue in piValues)         {             PITimeServer.PITime piTime = piValue.TimeStamp; //PI时间             output+= piPoint.Name + " " + piTime.LocalDate.ToString() + " " + piValue.Value + Environment.NewLine;         }     }     return output; }

　　5. 取得多个tag历史时刻值

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/// <summary> /// 取得多个tag段历史时间点值 /// </summary> /// <param name="server">PI服务对象</param> /// <param name="tag">tag名称</param> /// <returns></returns> private string MultipleHistory2(Server server, string tag) {     string output = string.Empty;     PointList ptlist = SearchPIPoints(server, tag);            PISDKCommon.NamedValues nvErrs = new PISDKCommon.NamedValues();        PITimeServer.PITimeFormat piTime1 = new PITimeServer.PITimeFormat();     piTime1.InputString = "*-2h";//or "2012-2-2 2:2:2"     //获取两小时前的时刻值     PointValues ptvalues = ptlist.Data.ArcValue(piTime1, RetrievalTypeConstants.rtAuto, out nvErrs);     foreach (PointValue myValue in ptvalues)     {         PITimeServer.PITime piTime = myValue.PIValue.TimeStamp; //PI时间         if (myValue.PIValue.Value.GetType().IsCOMObject)         {             //状态值             DigitalState myDigState = (DigitalState)myValue.PIValue.Value;             output+= myValue.PIPoint.Name + " " + piTime.LocalDate.ToString() + " " + myDigState.Name + Environment.NewLine;                        }         else         {             //模拟值             output+= myValue.PIPoint.Name + " " + piTime.LocalDate.ToString() + " " + Convert.ToString(Math.Round(double.Parse(Convert.ToString(myValue.PIValue.Value)), 2)) + Environment.NewLine;            }     }     return output; }

　　

转载自：https://www.cnblogs.com/Johnny_Z/p/3234849.html