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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Snapshot_Value
{
    public partial class Form1 : System.Windows.Forms.Form
    {
        //
        // Global Data
        //
        PISDK.PISDK g_SDK;
        PISDKDlg.ApplicationObject g_SDKDlgAppObject;   // PISDK dialog app. object
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //
            // Create the SDK object here. That will give the program the 
            //    benefits of caching of servers and points.
            // Also create the PISDK Dialogs Application object so we can use
            //    Tag Search.
            //
            try
            {
                g_SDK = new PISDK.PISDKClass();
                g_SDKDlgAppObject = new PISDKDlg.ApplicationObjectClass();
            }
            catch (System.Runtime.InteropServices.COMException comExc)
            {
                MessageBox.Show(comExc.Message, comExc.ErrorCode   " Error",
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Exclamation);
            };
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //
            // Display the Tag Search dialog and fill out the form with the result
            //
            PISDKDlg.TagSearch myTagSearch;        // PISDK Tag search display object
            PISDK._PointList myPointList;         // point list returned from tag search
            PISDKCommon.NamedValues nvsSelServers; // Namedvalues collection of servers
            PISDKDlg.TagSearchOptions tsOptions;   // tag search dialog options
            object valInx;                         // Variant for index
            object strObject;                      // Variant for string

            myTagSearch = g_SDKDlgAppObject.TagSearch;
            //
            // Pass the server that is in textBox1 as a default.
            // Only allow a single tag to be selected.
            //
            nvsSelServers = new PISDKCommon.NamedValuesClass();
            strObject = textBox1.Text;
            nvsSelServers.Add(textBox1.Text, ref strObject);
            tsOptions = PISDKDlg.TagSearchOptions.tsoptSingleSelect;
            myPointList = myTagSearch.Show(nvsSelServers, tsOptions);
            if (0 != myPointList.Count)
            {
                valInx = 1;
                //
                // Get Server name
                //
                textBox1.Text = myPointList.get_Item(ref valInx).Parent.Name;
                //
                // Get Tag name
                //
                textBox2.Text = myPointList.get_Item(ref valInx).Name;
            };


    }

        private void button2_Click(object sender, EventArgs e)
        {
            //
            //  Get the snapshot value of the tag in textBox2 from the server
            //    in textBox1
            //
            PISDK.Server myServer;     // server object from the name in textBox1
            PISDK.PIPoints myPoints;   // PIPoints collection of server
            PISDK.PIPoint snapPoint;   // point from the name in textBox2
            PISDK.PIValue myValue;     // snapshot value

            if (textBox1.Text.Equals(""))
            {
                MessageBox.Show("No server entered.", "Error", MessageBoxButtons.OK,
                   MessageBoxIcon.Exclamation);
            }
            else
            {
                if (textBox2.Text.Equals(""))
                {
                    MessageBox.Show("No tag entered.", "Error", MessageBoxButtons.OK,
                       MessageBoxIcon.Exclamation);
                }
                else
                {
                    try
                    {
                        myServer = g_SDK.Servers[textBox1.Text];
                        myPoints = myServer.PIPoints;
                        snapPoint = myPoints[textBox2.Text];
                        myValue = snapPoint.Data.Snapshot;
                        textBox3.Text = myValue.TimeStamp.LocalDate.ToString();
                        //
                        // Check to see if we got a digital state back
                        //
                        if (myValue.Value.GetType().IsCOMObject)
                        {
                            PISDK.DigitalState myDigState;
                            myDigState = (PISDK.DigitalState)myValue.Value;
                            textBox4.Text = myDigState.Name;
                        }
                        else
                        {
                            textBox4.Text = myValue.Value.ToString();
                        };
                    }
                    catch (System.Runtime.InteropServices.COMException comExc)
                    {
                        MessageBox.Show(comExc.Message, comExc.ErrorCode   " Error",
                           MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    };
                };
            };

        }

    }
}