// This example shows how change the update rate of multiple existing subscriptions.
using System;
using System.Threading;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.OperationModel;
namespace DocExamples.DataAccess._EasyDAClient
{
class ChangeMultipleItemSubscriptions
{
public static void Main1()
{
// Instantiate the client object.
using (var client = new EasyDAClient())
{
client.ItemChanged += client_ItemChanged;
Console.WriteLine("Subscribing...");
int[] handleArray = client.SubscribeMultipleItems(new[]
{
new DAItemGroupArguments("", "OPCLabs.KitServer.2", "Simulation.Random", 1000, null),
new DAItemGroupArguments("", "OPCLabs.KitServer.2", "Trends.Ramp (1 min)", 1000, null),
new DAItemGroupArguments("", "OPCLabs.KitServer.2", "Trends.Sine (1 min)", 1000, null),
new DAItemGroupArguments("", "OPCLabs.KitServer.2", "Simulation.Register_I4", 1000, null)
});
Console.WriteLine("Waiting for 10 seconds...");
Thread.Sleep(10 * 1000);
Console.WriteLine("Changing subscriptions...");
client.ChangeMultipleItemSubscriptions(new[]
{
new DAHandleGroupArguments(handleArray[0], 100),
new DAHandleGroupArguments(handleArray[1], 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: {e.ErrorMessageBrief}");
}
}
}
# This example shows how change the update rate of multiple existing subscriptions.
# 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 *
from OpcLabs.EasyOpc.DataAccess.OperationModel import *
# Item changed event handler.
def itemChanged(sender, e):
if e.Succeeded:
print(e.Arguments.ItemDescriptor.ItemId, ': ', e.Vtq, sep='')
else:
print(e.Arguments.ItemDescriptor.ItemId, ' *** Failure: ', e.ErrorMessageBrief, sep='')
# Instantiate the client object.
client = EasyDAClient()
client.ItemChanged += itemChanged
print('Subscribing item changes...')
handleArray = client.SubscribeMultipleItems([
EasyDAItemSubscriptionArguments('', 'OPCLabs.KitServer.2', 'Simulation.Random', 1000, None),
EasyDAItemSubscriptionArguments('', 'OPCLabs.KitServer.2', 'Trends.Ramp (1 min)', 1000, None),
EasyDAItemSubscriptionArguments('', 'OPCLabs.KitServer.2', 'Trends.Sine (1 min)', 1000, None),
EasyDAItemSubscriptionArguments('', 'OPCLabs.KitServer.2', 'Simulation.Register_I4', 1000, None),
])
print('Processing item change notifications for 10 seconds...')
time.sleep(10)
print('Changing item subscriptions...')
client.ChangeMultipleItemSubscriptions([
DAHandleGroupArguments(handleArray[0], 100),
DAHandleGroupArguments(handleArray[1], 100),
])
print('Processing item change notifications for 10 seconds...')
time.sleep(10)
print('Unsubscribing all items...')
client.UnsubscribeAllItems()
print('Waiting for 10 seconds...')
time.sleep(10)
client.ItemChanged -= itemChanged
print('Finished.')
