// This example shows how change the update rate of an existing subscription.
using System;
using System.Threading;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.OperationModel;
namespace DocExamples.DataAccess._EasyDAClient
{
partial class ChangeItemSubscription
{
public static void Main1()
{
// Instantiate the client object.
using (var client = new EasyDAClient())
{
client.ItemChanged += client_ItemChanged;
Console.WriteLine("Subscribing...");
int handle = client.SubscribeItem("", "OPCLabs.KitServer.2", "Simulation.Random", 1000);
Console.WriteLine("Waiting for 10 seconds...");
Thread.Sleep(10 * 1000);
Console.WriteLine("Changing subscription...");
client.ChangeItemSubscription(handle, new DAGroupParameters(100));
Console.WriteLine("Waiting for 10 seconds...");
Thread.Sleep(10 * 1000);
Console.WriteLine("Unsubscribing...");
client.UnsubscribeAllItems();
Console.WriteLine("Waiting for 10 seconds...");
Thread.Sleep(10 * 1000);
}
}
// Item changed event handler
static void client_ItemChanged(object sender, EasyDAItemChangedEventArgs e)
{
if (e.Succeeded)
Console.WriteLine(e.Vtq);
else
Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief);
}
}
}
# This example shows how change the update rate of an existing subscription.
# 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...')
handle = IEasyDAClientExtension.SubscribeItem(client, '', 'OPCLabs.KitServer.2', 'Simulation.Random', 1000)
print('Processing item change notifications for 10 seconds...')
time.sleep(10)
print('Changing item subscription...')
IEasyDAClientExtension.ChangeItemSubscription(client, handle, DAGroupParameters(100))
print('Processing item change notifications for 10 seconds...')
time.sleep(10)
print('Unsubscribing item...')
IEasyDAClientExtension.UnsubscribeItem(client, handle)
print('Waiting for 10 seconds...')
time.sleep(10)
client.ItemChanged -= itemChanged
print('Finished.')
' This example shows how change the update rate of an existing subscription.
Imports System.Threading
Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.OperationModel
Namespace DataAccess._EasyDAClient
Partial Friend Class ChangeItemSubscription
Public Shared Sub Main1()
Using client = New EasyDAClient()
AddHandler client.ItemChanged, AddressOf client_ItemChanged
Console.WriteLine("Subscribing...")
Dim handle As Integer = client.SubscribeItem("", "OPCLabs.KitServer.2", "Simulation.Random", 1000)
Console.WriteLine("Waiting for 10 seconds...")
Thread.Sleep(10 * 1000)
Console.WriteLine("Changing subscription...")
client.ChangeItemSubscription(handle, New DAGroupParameters(100))
Console.WriteLine("Waiting for 10 seconds...")
Thread.Sleep(10 * 1000)
Console.WriteLine("Unsubscribing...")
client.UnsubscribeAllItems()
Console.WriteLine("Waiting for 10 seconds...")
Thread.Sleep(10 * 1000)
End Using
End Sub
' Item changed event handler
Private Shared Sub client_ItemChanged(ByVal sender As Object, ByVal 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
