Parameters
- handlesToUnsubscribe
- Array of subscription handles
The value of this parameter cannot be
null
(Nothing
in Visual Basic).
OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA Namespace > IEasyUAClient Interface : UnsubscribeMultipleMonitoredItems Method |
The value of this parameter cannot be null
(Nothing
in Visual Basic).
void UnsubscribeMultipleMonitoredItems( IEnumerable<int> handlesToUnsubscribe )
void UnsubscribeMultipleMonitoredItems( IEnumerable<int>^ handlesToUnsubscribe )
'Declaration
Sub UnsubscribeMultipleMonitoredItems( _ ByVal handlesToUnsubscribe As IEnumerable(Of Integer) _ )
'Usage
Dim instance As IEasyUAClient Dim handlesToUnsubscribe As IEnumerable(Of Integer) instance.UnsubscribeMultipleMonitoredItems(handlesToUnsubscribe)
The value of this parameter cannot be null
(Nothing
in Visual Basic).
Exception | Description |
---|---|
System.ArgumentException | One of the arguments provided to a method is not valid. This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception. |
System.ArgumentNullException |
A This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception. |
System.ObjectDisposedException | An operation was performed on a disposed object. |
This method allows for batch operations on unsubscribing monitored items, potentially improving performance and efficiency when managing large numbers of subscriptions.
// This example shows how to unsubscribe from changes of multiple items. // // 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 { partial class UnsubscribeMultipleMonitoredItems { 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 and hook events. var client = new EasyUAClient(); client.DataChangeNotification += client_DataChangeNotification; Console.WriteLine("Subscribing..."); int[] handleArray = client.SubscribeMultipleMonitoredItems(new[] { new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", 1000), new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000), new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", 1000) }); Console.WriteLine("Processing monitored item changed events for 10 seconds..."); System.Threading.Thread.Sleep(10 * 1000); Console.WriteLine("Unsubscribing..."); client.UnsubscribeMultipleMonitoredItems(handleArray); Console.WriteLine("Waiting for 5 seconds..."); System.Threading.Thread.Sleep(5 * 1000); Console.WriteLine("Finished."); } static void client_DataChangeNotification(object sender, EasyUADataChangeNotificationEventArgs e) { // Display value. if (e.Succeeded) Console.WriteLine($"{e.Arguments.NodeDescriptor}: {e.AttributeData.Value}"); else Console.WriteLine($"{e.Arguments.NodeDescriptor} *** Failure: {e.ErrorMessageBrief}"); } } }
# This example shows how to unsubscribe from changes of multiple items. # # 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 using namespace OpcLabs.EasyOpc.UA.AddressSpace using namespace OpcLabs.EasyOpc.UA.OperationModel # 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" $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 # Data change notification handler Register-ObjectEvent -InputObject $client -EventName DataChangeNotification -Action { if ($EventArgs.Succeeded) { Write-Host "$($EventArgs.Arguments.NodeDescriptor): $($EventArgs.AttributeData.Value)" } else { Write-Host "$($EventArgs.Arguments.NodeDescriptor) *** Failure: $($EventArgs.ErrorMessageBrief)" } } Write-Host "Subscribing..." $handleArray = $client.SubscribeMultipleMonitoredItems(@( (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10845")), 1000)), (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10853")), 1000)), (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10855")), 1000)) )) Write-Host "Processing data change events for 10 seconds..." $stopwatch = [System.Diagnostics.Stopwatch]::StartNew() while ($stopwatch.Elapsed.TotalSeconds -lt 10) { Start-Sleep -Seconds 1 } Write-Host "Unsubscribing..." $client.UnsubscribeMultipleMonitoredItems($handleArray) Write-Host "Waiting for 5 seconds..." Start-Sleep -Seconds 5 Write-Host "Finished."
' This example shows how to unsubscribe from changes of multiple items. ' ' 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 UnsubscribeMultipleMonitoredItems 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 and hook events Dim client = New EasyUAClient() AddHandler client.DataChangeNotification, AddressOf client_DataChangeNotification Console.WriteLine("Subscribing...") Dim handleArray() As Integer = client.SubscribeMultipleMonitoredItems(New EasyUAMonitoredItemArguments() _ { _ New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", 1000), _ New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000), _ New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", 1000) _ } _ ) Console.WriteLine("Processing monitored item changed events for 10 seconds...") Threading.Thread.Sleep(10 * 1000) Console.WriteLine("Unsubscribing...") client.UnsubscribeMultipleMonitoredItems(handleArray) Console.WriteLine("Waiting for 5 seconds...") Threading.Thread.Sleep(5 * 1000) End Sub Private Shared Sub client_DataChangeNotification(ByVal sender As Object, ByVal e As EasyUADataChangeNotificationEventArgs) ' Display value If e.Succeeded Then Console.WriteLine("{0}: {1}", e.Arguments.NodeDescriptor, e.AttributeData.Value) Else Console.WriteLine("{0} *** Failure: {1}", e.Arguments.NodeDescriptor, e.ErrorMessageBrief) End If End Sub End Class End Namespace
# This example shows how to unsubscribe from changes of multiple items. # # 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 * def dataChangeNotification(sender, e): # Display value. if e.Succeeded: print(e.Arguments.NodeDescriptor, ': ', e.AttributeData.Value, sep='') else: print(e.Arguments.NodeDescriptor, ' *** Failure: ', e.ErrorMessageBrief, sep='') endpointDescriptor = 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 and hook events. client = EasyUAClient() client.DataChangeNotification += dataChangeNotification print('Subscribing...') handleArray = client.SubscribeMultipleMonitoredItems([ EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10845'), UAMonitoringParameters(1000)), EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'), UAMonitoringParameters(1000)), EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10855'), UAMonitoringParameters(1000)), ]) print('Processing data change events for 10 seconds...') time.sleep(10) print('Unsubscribing...') client.UnsubscribeMultipleMonitoredItems(handleArray) print('Waiting for 5 seconds...') time.sleep(5) print('Finished.')
// This example shows how to unsubscribe from changes of just some monitored // items. // // 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 { partial class UnsubscribeMultipleMonitoredItems { public static void Some() { 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 and hook events. var client = new EasyUAClient(); client.DataChangeNotification += client_DataChangeNotification2; Console.WriteLine(); Console.WriteLine("Subscribing..."); int[] handleArray = client.SubscribeMultipleMonitoredItems(new[] { new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", 1000), new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000), new EasyUAMonitoredItemArguments(null, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", 1000) }); for (int i = 0; i < handleArray.Length; i++) Console.WriteLine($"handleArray[{i}]: {handleArray[i]}"); Console.WriteLine(); Console.WriteLine("Processing monitored item changed events for 10 seconds..."); System.Threading.Thread.Sleep(10 * 1000); Console.WriteLine(); Console.WriteLine("Unsubscribing from 2 monitored items..."); // We will unsubscribe from the first and third monitored item we have // previously subscribed to. client.UnsubscribeMultipleMonitoredItems(new [] {handleArray[0], handleArray[2]}); Console.WriteLine(); Console.WriteLine("Processing monitored item changed events for 10 seconds..."); System.Threading.Thread.Sleep(10 * 1000); Console.WriteLine(); Console.WriteLine("Unsubscribing from all remaining monitored items..."); client.UnsubscribeAllMonitoredItems(); Console.WriteLine("Waiting for 5 seconds..."); System.Threading.Thread.Sleep(5 * 1000); Console.WriteLine("Finished."); } static void client_DataChangeNotification2(object sender, EasyUADataChangeNotificationEventArgs e) { // Display value. if (e.Succeeded) Console.WriteLine($"{e.Arguments.NodeDescriptor}: {e.AttributeData.Value}"); else Console.WriteLine($"{e.Arguments.NodeDescriptor} *** Failure: {e.ErrorMessageBrief}"); } } }
# This example shows how to unsubscribe from changes of multiple items. # # 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 using namespace OpcLabs.EasyOpc.UA.AddressSpace using namespace OpcLabs.EasyOpc.UA.OperationModel # 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" $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 # Data change notification handler Register-ObjectEvent -InputObject $client -EventName DataChangeNotification -Action { if ($EventArgs.Succeeded) { Write-Host "$($EventArgs.Arguments.NodeDescriptor): $($EventArgs.AttributeData.Value)" } else { Write-Host "$($EventArgs.Arguments.NodeDescriptor) *** Failure: $($EventArgs.ErrorMessageBrief)" } } Write-Host "Subscribing..." $handleArray = $client.SubscribeMultipleMonitoredItems(@( (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10845")), 1000)), (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10853")), 1000)), (New-Object UAMonitoredItemArguments( (New-Object UAAttributeArguments($endpointDescriptor, [UANodeDescriptor]"nsu=http://test.org/UA/Data/ ;i=10855")), 1000)) )) for ($i = 0; $i -lt $handleArray.Length; $i++) { Write-Host "handleArray[$($i)]: $($handleArray[$i])" } Write-Host Write-Host "Processing data change events for 10 seconds..." $stopwatch = [System.Diagnostics.Stopwatch]::StartNew() while ($stopwatch.Elapsed.TotalSeconds -lt 10) { Start-Sleep -Seconds 1 } Write-Host Write-Host "Unsubscribing from 2 monitored items..." # We will unsubscribe from the first and third monitored item we have # previously subscribed to. $client.UnsubscribeMultipleMonitoredItems([int[]]@($handleArray[0], $handleArray[2])) Write-Host Write-Host "Processing data change events for 10 seconds..." $stopwatch = [System.Diagnostics.Stopwatch]::StartNew() while ($stopwatch.Elapsed.TotalSeconds -lt 10) { Start-Sleep -Seconds 1 } Write-Host Write-Host "Unsubscribing from all remaining monitored items..." $client.UnsubscribeAllMonitoredItems() Write-Host "Waiting for 5 seconds..." Start-Sleep -Seconds 5 Write-Host "Finished."
' This example shows how to unsubscribe from changes of just some monitored ' items. ' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . ' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. Imports OpcLabs.EasyOpc.UA Imports OpcLabs.EasyOpc.UA.OperationModel Namespace _EasyUAClient Partial Friend Class UnsubscribeMultipleMonitoredItems Public Shared Sub Some() ' Define which server we will work with. Dim endpointDescriptor As UAEndpointDescriptor = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer" ' or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported) ' or "https://opcua.demo-this.com:51212/UA/SampleServer/" ' Instantiate the client object and hook events Dim client = New EasyUAClient() AddHandler client.DataChangeNotification, AddressOf client_DataChangeNotification2 Console.WriteLine() Console.WriteLine("Subscribing...") Dim handleArray() As Integer = client.SubscribeMultipleMonitoredItems(New EasyUAMonitoredItemArguments() _ { New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", 1000), New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", 1000), New EasyUAMonitoredItemArguments(Nothing, endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", 1000) } ) For i As Integer = 0 To handleArray.Length - 1 Console.WriteLine($"handleArray[{i}]: {handleArray(i)}") Next i Console.WriteLine() Console.WriteLine("Processing monitored item changed events for 10 seconds...") System.Threading.Thread.Sleep(10 * 1000) Console.WriteLine() Console.WriteLine("Unsubscribing from 2 monitored items...") ' We will unsubscribe from the first and third monitored item we have ' previously subscribed to. client.UnsubscribeMultipleMonitoredItems(New Integer() {handleArray(0), handleArray(2)}) Console.WriteLine() Console.WriteLine("Processing monitored item changed events for 10 seconds...") System.Threading.Thread.Sleep(10 * 1000) Console.WriteLine() Console.WriteLine("Unsubscribing from all remaining monitored items...") client.UnsubscribeAllMonitoredItems() Console.WriteLine("Waiting for 5 seconds...") System.Threading.Thread.Sleep(5 * 1000) Console.WriteLine("Finished.") End Sub Private Shared Sub client_DataChangeNotification2(ByVal sender As Object, ByVal e As EasyUADataChangeNotificationEventArgs) ' Display value If e.Succeeded Then Console.WriteLine($"{e.Arguments.NodeDescriptor}: {e.AttributeData.Value}") Else Console.WriteLine($"{e.Arguments.NodeDescriptor} *** Failure: {e.ErrorMessageBrief}") End If End Sub End Class End Namespace
REM This example shows how to unsubscribe from changes of just some monitored REM items. 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. ' The client object, with events 'Public WithEvents Client8 As EasyUAClient Public Sub UnsubscribeMultipleMonitoredItems_Some_Command_Click() OutputText = "" Set Client8 = New EasyUAClient OutputText = OutputText & "Subscribing..." & vbCrLf Dim MonitoringParameters As New UAMonitoringParameters MonitoringParameters.SamplingInterval = 1000 Dim MonitoredItemArguments1 As New EasyUAMonitoredItemArguments MonitoredItemArguments1.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer" MonitoredItemArguments1.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10845" Set MonitoredItemArguments1.MonitoringParameters = MonitoringParameters MonitoredItemArguments1.SetState ("Item1") Dim MonitoredItemArguments2 As New EasyUAMonitoredItemArguments MonitoredItemArguments2.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer" MonitoredItemArguments2.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10853" Set MonitoredItemArguments2.MonitoringParameters = MonitoringParameters MonitoredItemArguments2.SetState ("Item2") Dim MonitoredItemArguments3 As New EasyUAMonitoredItemArguments MonitoredItemArguments3.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer" MonitoredItemArguments3.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10855" Set MonitoredItemArguments3.MonitoringParameters = MonitoringParameters MonitoredItemArguments3.SetState ("Item3") Dim arguments(2) As Variant Set arguments(0) = MonitoredItemArguments1 Set arguments(1) = MonitoredItemArguments2 Set arguments(2) = MonitoredItemArguments3 Dim handleArray As Variant handleArray = Client8.SubscribeMultipleMonitoredItems(arguments) Dim i As Long: For i = LBound(handleArray) To UBound(handleArray) OutputText = OutputText & "handleArray(" & i & "): " & handleArray(i) & vbCrLf Next OutputText = OutputText & vbCrLf OutputText = OutputText & "Processing monitored item changed events for 10 seconds..." & vbCrLf Pause 10000 OutputText = OutputText & vbCrLf OutputText = OutputText & "Unsubscribing from 2 monitored items..." & vbCrLf Dim SelectedHandles(1) As Variant ' We will unsubscribe from the first and third monitored item we have ' previously subscribed to. SelectedHandles(0) = handleArray(0) SelectedHandles(1) = handleArray(2) Client8.UnsubscribeMultipleMonitoredItems (SelectedHandles) OutputText = OutputText & vbCrLf OutputText = OutputText & "Processing monitored item changed events for 10 seconds..." & vbCrLf Pause 10000 OutputText = OutputText & vbCrLf OutputText = OutputText & "Unsubscribing from all remaining monitored items..." & vbCrLf Call Client8.UnsubscribeAllMonitoredItems OutputText = OutputText & "Waiting for 5 seconds..." & vbCrLf Pause 5000 Set Client8 = Nothing OutputText = OutputText & "Finished." & vbCrLf End Sub Public Sub Client8_DataChangeNotification(ByVal sender As Variant, ByVal eventArgs As EasyUADataChangeNotificationEventArgs) ' Display the data If eventArgs.Succeeded Then OutputText = OutputText & eventArgs.arguments.nodeDescriptor & ": " & eventArgs.AttributeData & vbCrLf Else OutputText = OutputText & eventArgs.arguments.nodeDescriptor & ": " & eventArgs.ErrorMessageBrief & vbCrLf End If End Sub
# This example shows how to unsubscribe from changes of just some monitored # items. # # 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 System.Collections.Generic import * from OpcLabs.EasyOpc.UA import * from OpcLabs.EasyOpc.UA.OperationModel import * def dataChangeNotification(sender, e): # Display value. if e.Succeeded: print(e.Arguments.NodeDescriptor, ': ', e.AttributeData.Value, sep='') else: print(e.Arguments.NodeDescriptor, ' *** Failure: ', e.ErrorMessageBrief, sep='') endpointDescriptor = 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 and hook events. client = EasyUAClient() client.DataChangeNotification += dataChangeNotification print('Subscribing...') handleArray = client.SubscribeMultipleMonitoredItems([ EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10845'), UAMonitoringParameters(1000)), EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'), UAMonitoringParameters(1000)), EasyUAMonitoredItemArguments( None, endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10855'), UAMonitoringParameters(1000)), ]) for i, handle in enumerate(handleArray): print('handleArray[', i, ']: ', handle, sep='') print() print('Processing data change events for 10 seconds...') time.sleep(10) print() print('Unsubscribing from 2 monitored items...') handleList = List[int]() handleList.Add(handleArray[0]) handleList.Add(handleArray[2]) client.UnsubscribeMultipleMonitoredItems(handleList) print() print('Processing data change events for 10 seconds...') time.sleep(10) print() print('Unsubscribing from all remaining monitored items...') client.UnsubscribeAllMonitoredItems() print('Waiting for 5 seconds...') time.sleep(5) print('Finished.')
Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows
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