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;
using OPCAutomation;
namespace OPC
{
public partial class Form1 : Form
{
OPCServer ObjOPCServer;
OPCGroups ObjOPCGroups;
OPCGroup ObjOPCGroup;
string OPCServerName;
public Form1()
{
try
{
InitializeComponent();
OPCServerName = "{Here comes your OPC server’s name}";
ObjOPCServer = new OPCServer();
ObjOPCServer.Connect(OPCServerName, "");
ObjOPCGroups = ObjOPCServer.OPCGroups;
ObjOPCGroup = ObjOPCGroups.Add("OPCGroup1");
ObjOPCGroup.DataChange += new DIOPCGroupEvent_DataChangeEventHandler(ObjOPCGroup_DataChange);
ObjOPCGroup.OPCItems.AddItem("{tag name or address (like {plc name on server}!%mw0)}", 1);
ObjOPCGroup.UpdateRate = 10;
ObjOPCGroup.IsActive = true;
ObjOPCGroup.IsSubscribed = true;
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}
private void button1_Click(object sender, EventArgs e)
{
}
private void ObjOPCGroup_DataChange(int TransactionID, int NumItems, ref Array ClientHandles, ref Array ItemValues, ref Array Qualities, ref Array TimeStamps)
{
for (int i = 1; i <= NumItems; i++)
{
if ((Convert.ToInt32(ClientHandles.GetValue(i)) == 1))
{
textBox1.Text = ItemValues.GetValue(i).ToString();
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
OPCServerClass GlobalOPCServer = new OPCServerClass();
Array ServerList = (Array)GlobalOPCServer.GetOPCServers(""); for (int i = 1; i <= ServerList.Length; i++)
{ comboBox1.Items.Add(ServerList.GetValue(i).ToString()); }
}
}
from: GitHub.com