OPC Studio User's Guide and Reference
UnsubscribeAllEvents Method (_EasyAEClient)
Example 



OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.AlarmsAndEvents.ComTypes Namespace > _EasyAEClient Interface : UnsubscribeAllEvents Method
Unsubscribe from changes of all OPC events.
Syntax
'Declaration
 
Sub UnsubscribeAllEvents() 
'Usage
 
Dim instance As _EasyAEClient
 
instance.UnsubscribeAllEvents()
void UnsubscribeAllEvents()
void UnsubscribeAllEvents(); 
Remarks
All event subscriptions on this OpcLabs.EasyOpc.AlarmsAndEvents.IEasyAEClient object are unsubscribed. Their corresponding handles become invalid after this method is called.

This member or type is for use from COM. It is not meant to be used from .NET or Python. Refer to the corresponding .NET member or type instead, if you are developing in .NET or Python.

This method or property does not throw any exceptions, aside from execution exceptions such as System.Threading.ThreadAbortException or System.OutOfMemoryException.

Example

COM

Rem This example shows how to unsubscribe from all event notifications.
Rem
Rem Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
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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.

Option Explicit

Dim ServerDescriptor: Set ServerDescriptor = CreateObject("OpcLabs.EasyOpc.ServerDescriptor")
ServerDescriptor.ServerClass = "OPCLabs.KitEventServer.2"

Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient")
WScript.ConnectObject Client, "Client_"

WScript.Echo "Subscribing..."
Dim SubscriptionParameters: Set SubscriptionParameters = CreateObject("OpcLabs.EasyOpc.AlarmsAndEvents.AESubscriptionParameters")
SubscriptionParameters.NotificationRate = 1000
Client.SubscribeEvents ServerDescriptor, SubscriptionParameters, True, Nothing

WScript.Echo "Waiting for 10 seconds..."
WScript.Sleep 10*1000

WScript.Echo "Unsubscribing..."
Client.UnsubscribeAllEvents

WScript.Echo "Waiting for 10 seconds..."
WScript.Sleep 10*1000



Rem Notification event handler
Sub Client_Notification(Sender, e)
    If Not (e.Succeeded) Then
        WScript.Echo "*** Failure: " & e.ErrorMessageBrief
        Exit Sub
    End If

    If Not e.EventData Is Nothing Then WScript.Echo e.EventData.Message
End Sub
Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

See Also