// This example shows how to subscribe to events and obtain the notification events by pulling them.
using System;
using OpcLabs.EasyOpc.AlarmsAndEvents;
using OpcLabs.EasyOpc.AlarmsAndEvents.OperationModel;
namespace DocExamples.AlarmsAndEvents._EasyAEClient
{
class PullNotification
{
public static void Main1()
{
// Instantiate the client object.
// In order to use event pull, you must set a non-zero queue capacity upfront.
using (var client = new EasyAEClient { PullNotificationQueueCapacity = 1000 })
{
Console.WriteLine("Subscribing events...");
int handle = client.SubscribeEvents("", "OPCLabs.KitEventServer.2", 1000);
Console.WriteLine("Processing event notifications for 1 minute...");
int endTick = Environment.TickCount + 60 * 1000;
do
{
EasyAENotificationEventArgs eventArgs = client.PullNotification(2 * 1000);
if (!(eventArgs is null))
// Handle the notification event
Console.WriteLine(eventArgs);
} while (Environment.TickCount < endTick);
Console.WriteLine("Unsubscribing events...");
client.UnsubscribeEvents(handle);
Console.WriteLine("Finished.");
}
}
}
}
# This example shows how to subscribe to events and obtain the notification events by pulling them.
#requires -Version 5.1
using namespace OpcLabs.EasyOpc.AlarmsAndEvents
# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/net472/OpcLabs.EasyOpcClassicCore.dll"
Add-Type -Path "../../../Components/net472/OpcLabs.EasyOpcClassic.dll"
# Instantiate the client object.
$client = New-Object EasyAEClient
# In order to use event pull, you must set a non-zero queue capacity upfront.
$client.PullNotificationQueueCapacity = 1000
Write-Host "Subscribing events..."
$handle = [OpcLabs.EasyOpc.AlarmsAndEvents.IEasyAEClientExtension]::SubscribeEvents($client,
"", "OPCLabs.KitEventServer.2", 1000)
Write-Host "Processing event notifications for 1 minute..."
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
while ($stopwatch.Elapsed.TotalSeconds -lt 60) {
$eventArgs = $client.PullNotification(2*1000)
if ($eventArgs -ne $null) {
# Handle the notification event
Write-Host $eventArgs
}
}
Write-Host "Unsubscribing events..."
$client.UnsubscribeEvents($handle)
Write-Host "Finished."
// This example shows how to subscribe to events and obtain the notification events by pulling them.
$ServerDescriptor = new COM("OpcLabs.EasyOpc.ServerDescriptor");
$ServerDescriptor->ServerClass = "OPCLabs.KitEventServer.2";
$Client = new COM("OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient");
// In order to use event pull, you must set a non-zero queue capacity upfront.
$Client->PullNotificationQueueCapacity = 1000;
print "Subscribing events...\n";
$SubscriptionParameters = new COM("OpcLabs.EasyOpc.AlarmsAndEvents.AESubscriptionParameters");
$SubscriptionParameters->NotificationRate = 1000;
$handle = $Client->SubscribeEvents($ServerDescriptor, $SubscriptionParameters, TRUE, NULL);
print "Processing event notifications for 1 minute...\n";
$endTime = time() + 60;
do {
$EventArgs = $Client->PullNotification(2*1000);
if (!is_null($EventArgs)) {
// Handle the notification event
print $EventArgs->ToString();
print "\n";
}
} while (time() < $endTime);
print "Unsubscribing events...\n";
$Client->UnsubscribeEvents($handle);
print "Finished.\n";
Rem This example shows how to subscribe to events and obtain the notification events by pulling them.
Private Sub PullNotification_Main_Command_Click()
OutputText = ""
Dim eventArgs As EasyAENotificationEventArgs
Dim serverDescriptor As New serverDescriptor
serverDescriptor.ServerClass = "OPCLabs.KitEventServer.2"
' Instantiate the client object
Dim client As New EasyAEClient
' In order to use event pull, you must set a non-zero queue capacity upfront.
client.PullNotificationQueueCapacity = 1000
OutputText = OutputText & "Subscribing events..." & vbCrLf
Dim subscriptionParameters As New AESubscriptionParameters
subscriptionParameters.notificationRate = 1000
Dim handle
Dim state
handle = client.SubscribeEvents(serverDescriptor, subscriptionParameters, True, state)
OutputText = OutputText & "Processing event notifications for 1 minute..." & vbCrLf
Dim endTick As Long
endTick = GetTickCount + 60000
While GetTickCount < endTick
Set eventArgs = client.PullNotification(2 * 1000)
If Not eventArgs Is Nothing Then
' Handle the notification event
OutputText = OutputText & eventArgs & vbCrLf
End If
Wend
OutputText = OutputText & "Unsubscribing events..." & vbCrLf
client.UnsubscribeEvents handle
OutputText = OutputText & "Finished." & vbCrLf
End Sub
' This example shows how to subscribe to events and obtain the notification events by pulling them.
Imports OpcLabs.EasyOpc.AlarmsAndEvents
Imports OpcLabs.EasyOpc.AlarmsAndEvents.OperationModel
Namespace AlarmsAndEvents._EasyAEClient
Partial Friend Class PullNotification
Public Shared Sub Main1()
Using client = New EasyAEClient()
' In order to use event pull, you must set a non-zero queue capacity upfront.
client.PullNotificationQueueCapacity = 1000
Console.WriteLine("Subscribing events...")
Dim handle As Integer = client.SubscribeEvents("", "OPCLabs.KitEventServer.2", 1000)
Console.WriteLine("Processing event notifications for 1 minute...")
Dim endTick As Integer = Environment.TickCount + 60 * 1000
Do
Dim eventArgs As EasyAENotificationEventArgs = client.PullNotification(2 * 1000)
If Not eventArgs Is Nothing Then
' Handle the notification event
Console.WriteLine(eventArgs)
End If
Loop While Environment.TickCount < endTick
Console.WriteLine("Unsubscribing events...")
client.UnsubscribeEvents(handle)
End Using
Console.WriteLine("Finished.")
End Sub
End Class
End Namespace