OPCAutomation.dll - how to attache it to project in Visual C#

[barosz]

I have got one question - how to add OPCAutomation.dll in Microsoft Visual C# ? I tried to do it by adding refenece to project but it is not working (I am receiving an error).

[sevki]

what error are you getting?

[barosz]

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Microsoft Visual C# 2010 Express

A reference to 'C:\WINDOWS\system32\OPCDAAuto.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.

OK

[sevki]

If I remember correctly that's the dll that's distributed by OPC foundation and it's definitely not the dll I'm referring to anyhow -S

On Tue, Jan 21, 2014 at 8:17 AM, barosz notifications@github.com wrote:

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Microsoft Visual C# 2010 Express

A reference to 'C:\WINDOWS\system32\OPCDAAuto.dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.

OK

---

Reply to this email directly or view it on GitHub: https://github.com/sevki/Posts/issues/2#issuecomment-32824144

[barosz]

Yes you are correct that's dll distributed by OPC foundation. I have just thought that you use from the source you may rely (not from unknown source).

[sevki]

I think you have a better chance of getting something to work if you actually try to find the dll mentioned.

[Haris11011]

Hi sevki, Hope u r doing well.

As I know much little about computer programming, so I am facing problem in trying to get values from local OPC server (Kepware), Em using OPCautomation.dll and your sample code as below.,

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

namespace WindowsFormsApplication8 { public partial class Form1 : Form {

    OPCServer ObjOPCServer;
    OPCGroups ObjOPCGroups;
    OPCGroup ObjOPCGroup;
    string OPCServerName;

    public Form1()
    {
        InitializeComponent();
        try
        {
            InitializeComponent();
            OPCServerName = "kepware.KEPServerEX.V6";
            ObjOPCServer = new OPCServer();
            ObjOPCServer.Connect(OPCServerName, "");
            ObjOPCGroups = ObjOPCServer.OPCGroups;
            ObjOPCGroup = ObjOPCGroups.Add("FX.TrialG1");
            ObjOPCGroup.OPCItems.AddItem("FX.TrialG1.Encoder",1);
            ObjOPCGroup.DataChange += new DIOPCGroupEvent_DataChangeEventHandler(ObjOPCGroup_DataChange);

            ObjOPCGroup.UpdateRate = 10;
            ObjOPCGroup.IsActive = true;
            ObjOPCGroup.IsSubscribed = true;
        }
        catch (Exception e)
        {
            MessageBox.Show(e.ToString());
        }

    }

    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)
   {

   }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }

}

}

After debugging and connected OPC server, C # application is running with out error but it is not getting/showing any value in text box. . However if i run application in disconnected mode of OPC server, it gives an error after application start,error showed in attached picture.

Thanks, Haris