_EasyDAItemChangedEventArgs Interface

Exposes OpcLabs.EasyOpc.DataAccess.OperationModel.EasyDAItemChangedEventArgs to COM clients.

Object Model

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<CLSCompliantAttribute(False)>
<ComVisibleAttribute(True)>
<GuidAttribute("A506D7B7-0886-4A2F-AD95-7078D666F812")>
<InterfaceTypeAttribute(ComInterfaceType.InterfaceIsDual)>
Public Interface _EasyDAItemChangedEventArgs

'Usage
 
Dim instance As _EasyDAItemChangedEventArgs

[CLSCompliant(false)]
[ComVisible(true)]
[Guid("A506D7B7-0886-4A2F-AD95-7078D666F812")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface _EasyDAItemChangedEventArgs

[CLSCompliant(false)]
[ComVisible(true)]
[Guid("A506D7B7-0886-4A2F-AD95-7078D666F812")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface class _EasyDAItemChangedEventArgs

Remarks

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.

Example

COM

VBScript

Rem This example subscribes to changes of 2 items separately, and displays rich information available with each item changed
Rem event notification.
Rem
Rem Find all latest examples here: https://www.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
Rem OPC client and subscriber examples in VBScript on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-VBScript .
Rem Missing some example? Ask us for it on our Online Forums, https://forum.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 Client: Set Client = CreateObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient")
WScript.ConnectObject Client, "Client_"

Client.SubscribeItem "", "OPCLabs.KitServer.2", "Simulation.Random", 5*1000
Client.SubscribeItem "", "OPCLabs.KitServer.2", "Trends.Ramp (1 min)", 5*1000

WScript.Echo "Processing item changed events for 1 minute..."
WScript.Sleep 60*1000



Sub Client_ItemChanged(Sender, e)
    On Error Resume Next
    WScript.Echo
    WScript.Echo "e.Arguments.State: " & e.Arguments.State
    WScript.Echo "e.Arguments.ServerDescriptor.MachineName: " & e.Arguments.ServerDescriptor.MachineName
    WScript.Echo "e.Arguments.ServerDescriptor.ServerClass: " & e.Arguments.ServerDescriptor.ServerClass
    WScript.Echo "e.Arguments.ItemDescriptor.ItemId: " & e.Arguments.ItemDescriptor.ItemId
    WScript.Echo "e.Arguments.ItemDescriptor.AccessPath: " & e.Arguments.ItemDescriptor.AccessPath
    WScript.Echo "e.Arguments.ItemDescriptor.RequestedDataType: " & e.Arguments.ItemDescriptor.RequestedDataType
    WScript.Echo "e.Arguments.GroupParameters.Locale: " & e.Arguments.GroupParameters.Locale
    WScript.Echo "e.Arguments.GroupParameters.RequestedUpdateRate: " & e.Arguments.GroupParameters.RequestedUpdateRate
    WScript.Echo "e.Arguments.GroupParameters.PercentDeadband: " & e.Arguments.GroupParameters.PercentDeadband
    WScript.Echo "e.Exception.Message: " & e.Exception.Message
    WScript.Echo "e.Exception.Source: " & e.Exception.Source
    WScript.Echo "e.Exception.ErrorCode: " & e.Exception.ErrorCode
    WScript.Echo "e.Vtq.Value: " & e.Vtq.Value
    WScript.Echo "e.Vtq.Timestamp: " & e.Vtq.Timestamp
    WScript.Echo "e.Vtq.TimestampLocal: " & e.Vtq.TimestampLocal
    WScript.Echo "e.Vtq.Quality: " & e.Vtq.Quality
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

Reference

_EasyDAItemChangedEventArgs Members
OpcLabs.EasyOpc.DataAccess.OperationModel.ComTypes Namespace

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