// This example shows how to subscribe to changes of a single monitored item, pull events, and display each change.
//
// 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 OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples._EasyUAClient
{
class PullDataChangeNotification
{
public static void Main1()
{
UAEndpointDescriptor endpointDescriptor =
"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
// or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
// or "https://opcua.demo-this.com:51212/UA/SampleServer/"
// Instantiate the client object
// In order to use event pull, you must set a non-zero queue capacity upfront.
var client = new EasyUAClient { PullDataChangeNotificationQueueCapacity = 1000 };
Console.WriteLine("Subscribing...");
client.SubscribeDataChange(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000);
Console.WriteLine("Processing data change events for 1 minute...");
int endTick = Environment.TickCount + 60 * 1000;
do
{
EasyUADataChangeNotificationEventArgs eventArgs = client.PullDataChangeNotification(2 * 1000);
if (!(eventArgs is null))
// Handle the notification event
Console.WriteLine(eventArgs);
} while (Environment.TickCount < endTick);
Console.WriteLine("Unsubscribing...");
client.UnsubscribeAllMonitoredItems();
}
}
}
# This example shows how to subscribe to changes of a single monitored item, pull events, and display each change.
#
# 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.UA
# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUA.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUAComponents.dll"
[UAEndpointDescriptor]$endpointDescriptor =
"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
# or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
# or "https://opcua.demo-this.com:51212/UA/SampleServer/"
# Instantiate the client object.
$client = New-Object EasyUAClient
# In order to use event pull, you must set a non-zero queue capacity upfront.
$client.PullDataChangeNotificationQueueCapacity = 1000
Write-Host "Subscribing..."
$client.SubscribeDataChange($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000)
Write-Host "Processing data change events for 1 minute..."
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
while ($stopwatch.Elapsed.TotalSeconds -lt 60) {
$eventArgs = $client.PullDataChangeNotification(2*1000)
if ($eventArgs -ne $null) {
# Handle the notification event
Write-Host $eventArgs
}
}
Write-Host "Unsubscribing..."
$client.UnsubscribeAllMonitoredItems()
Write-Host "Finished."
' This example shows how to subscribe to changes of a single monitored item, pull events, and display each change.
'
' 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 OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.OperationModel
Namespace _EasyUAClient
Friend Class PullDataChangeNotification
Public Shared Sub Main1()
' Define which server we will work with.
Dim endpointDescriptor As UAEndpointDescriptor =
"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
' or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
' or "https://opcua.demo-this.com:51212/UA/SampleServer/"
' Instantiate the client object
Dim client = New EasyUAClient()
' In order to use event pull, you must set a non-zero queue capacity upfront.
client.PullDataChangeNotificationQueueCapacity = 1000
Console.WriteLine("Subscribing...")
client.SubscribeDataChange(
endpointDescriptor,
"nsu=http://test.org/UA/Data/ ;i=10853",
1000) ' or "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
Console.WriteLine("Processing data change events for 1 minute...")
Dim endTick As Integer = Environment.TickCount + 60 * 1000
Do
Dim eventArgs As EasyUADataChangeNotificationEventArgs = client.PullDataChangeNotification(2 * 1000)
If Not eventArgs Is Nothing Then
' Handle the notification event
Console.WriteLine(eventArgs)
End If
Loop While Environment.TickCount < endTick
End Sub
End Class
End Namespace
REM This example shows how to subscribe to changes of a single monitored item, pull events, and display each change.
REM
REM Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
REM OPC client and subscriber examples in Visual Basic on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VB .
REM Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
REM a commercial license in order to use Online Forums, and we reply to every post.
Public Sub PullDataChangeNotification_Main_Command_Click()
OutputText = ""
Dim eventArgs As EasyUADataChangeNotificationEventArgs
' Instantiate the client object
Dim Client As New EasyUAClient
' In order to use event pull, you must set a non-zero queue capacity upfront.
Client.PullDataChangeNotificationQueueCapacity = 1000
OutputText = OutputText & "Subscribing..." & vbCrLf
Call Client.SubscribeDataChange("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853", 1000)
OutputText = OutputText & "Processing data changed notification events for 1 minute..." & vbCrLf
Dim EndTick As Long
EndTick = GetTickCount + 60000
While GetTickCount < EndTick
Set eventArgs = Client.PullDataChangeNotification(2 * 1000)
If Not eventArgs Is Nothing Then
' Handle the notification event
OutputText = OutputText & eventArgs & vbCrLf
End If
Wend
OutputText = OutputText & "Unsubscribing..." & vbCrLf
Client.UnsubscribeAllMonitoredItems
OutputText = OutputText & "Finished." & vbCrLf
End Sub
# This example shows how to subscribe to changes of a single monitored item, pull events, and display each change.
#
# 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.UA import *
from OpcLabs.EasyOpc.UA.OperationModel import *
# Instantiate the client object
client = EasyUAClient()
# In order to use event pull, you must set a non-zero queue capacity upfront.
client.PullDataChangeNotificationQueueCapacity = 1000
print('Subscribing...')
IEasyUAClientExtension.SubscribeDataChange(client,
UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer'),
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
1000)
print('Processing data change events for 1 minute...')
endTime = time.time() + 60
while time.time() < endTime:
eventArgs = IEasyUAClientExtension.PullDataChangeNotification(client, 2*1000)
if eventArgs is not None:
# Handle the notification event
print(eventArgs)
# This example shows how to subscribe to changes of multiple monitored items, pull events, and display each change.
#
# 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.UA import *
from OpcLabs.EasyOpc.UA.OperationModel import *
# Instantiate the client object
client = EasyUAClient()
# In order to use event pull, you must set a non-zero queue capacity upfront.
client.PullDataChangeNotificationQueueCapacity = 1000
print('Subscribing...')
client.SubscribeMultipleMonitoredItems([
EasyUAMonitoredItemArguments(
None,
UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer'),
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10845'),
UAMonitoringParameters(1000)),
EasyUAMonitoredItemArguments(
None,
UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer'),
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
UAMonitoringParameters(1000)),
EasyUAMonitoredItemArguments(
None,
UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer'),
UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10855'),
UAMonitoringParameters(1000)),
])
print('Processing data change events for 1 minute...')
endTime = time.time() + 60
while time.time() < endTime:
eventArgs = IEasyUAClientExtension.PullDataChangeNotification(client, 2*1000)
if eventArgs is not None:
# Handle the notification event
print(eventArgs)