// Hooking up events and receiving OPC item changes.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
// a commercial license in order to use Online Forums, and we reply to every post.
using System;
using System.Threading;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.OperationModel;
namespace DocExamples.DataAccess._EasyDAClient
{
partial class SubscribeItem
{
public static void Main1()
{
// Instantiate the client object.
using (var client = new EasyDAClient())
{
var eventHandler = new EasyDAItemChangedEventHandler(client_ItemChanged);
client.ItemChanged += eventHandler;
Console.WriteLine("Subscribing item...");
client.SubscribeItem("", "OPCLabs.KitServer.2", "Demo.Ramp", 200);
Console.WriteLine("Process item change notifications for 30 seconds...");
Thread.Sleep(30 * 1000);
Console.WriteLine("Unsubscribing all items...");
client.UnsubscribeAllItems();
client.ItemChanged -= eventHandler;
}
Console.WriteLine("Finished.");
}
static void client_ItemChanged(object sender, EasyDAItemChangedEventArgs e)
{
if (e.Succeeded)
Console.WriteLine(e.Vtq);
else
Console.WriteLine($"*** Failure: {e.ErrorMessageBrief}");
}
}
}
# Hooking up events and receiving OPC item changes.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in PowerShell on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PowerShell .
# Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
# a commercial license in order to use Online Forums, and we reply to every post.
#requires -Version 5.1
using namespace OpcLabs.EasyOpc.DataAccess
# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcClassicCore.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcClassic.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcClassicComponents.dll"
# Instantiate the client object.
$client = New-Object EasyDAClient
# Item changed event handler
Register-ObjectEvent -InputObject $client -EventName ItemChanged -Action {
if ($EventArgs.Succeeded) {
Write-Host $EventArgs.Vtq
}
else {
Write-Host "*** Failure: $($EventArgs.ErrorMessageBrief)"
}
}
Write-Host "Subscribing item..."
[IEasyDAClientExtension]::SubscribeItem($client, "", "OPCLabs.KitServer.2", "Demo.Ramp", 200)
Write-Host "Processing item changes for 30 seconds..."
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
while ($stopwatch.Elapsed.TotalSeconds -lt 30) {
Start-Sleep -Seconds 1
}
Write-Host "Unsubscribing items..."
$client.UnsubscribeAllItems()
Write-Host "Finished."
' Hooking up events and receiving OPC item changes.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET .
' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
' a commercial license in order to use Online Forums, and we reply to every post.
Imports System.Threading
Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.OperationModel
Namespace DataAccess._EasyDAClient
Partial Friend Class SubscribeItem
Shared Sub Main1()
Using client = New EasyDAClient()
Dim eventHandler = New EasyDAItemChangedEventHandler(AddressOf client_ItemChanged)
AddHandler client.ItemChanged, eventHandler
Console.WriteLine("Subscribing item...")
client.SubscribeItem("", "OPCLabs.KitServer.2", "Demo.Ramp", 200)
Thread.Sleep(30 * 1000)
client.UnsubscribeAllItems()
RemoveHandler client.ItemChanged, eventHandler
End Using
End Sub
Private Shared Sub client_ItemChanged(sender As Object, e As EasyDAItemChangedEventArgs)
If e.Succeeded Then
Console.WriteLine(e.Vtq)
Else
Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief)
End If
End Sub
End Class
End Namespace
# Hooking up events and receiving OPC item changes.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python .
# Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
# a commercial license in order to use Online Forums, and we reply to every post.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
import time
# Import .NET namespaces.
from OpcLabs.EasyOpc.DataAccess import *
# Item changed event handler.
def itemChanged(sender, e):
if e.Succeeded:
print(e.Vtq)
else:
print('*** Failure: ', e.ErrorMessageBrief, sep='')
# Instantiate the client object.
client = EasyDAClient()
client.ItemChanged += itemChanged
print('Subscribing item changes...')
IEasyDAClientExtension.SubscribeItem(client, '', 'OPCLabs.KitServer.2', 'Demo.Ramp', 200)
print('Processing item change notifications for 30 seconds...')
time.sleep(30)
print('Unsubscribing all items...')
client.UnsubscribeAllItems()
client.ItemChanged -= itemChanged
print('Finished.')
