GetItemPropertyRecord(IEasyDAClient,ServerDescriptor,DANodeDescriptor) Method

Obtains a DAItemPropertyRecord structure filled with OPC property values for a given OPC item. Obtains a structure filled with OPC property values of all well-known OPC properties for a given OPC item.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ExtensionAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function GetItemPropertyRecord( _
   ByVal client As IEasyDAClient, _
   ByVal serverDescriptor As ServerDescriptor, _
   ByVal nodeDescriptor As DANodeDescriptor _
) As DAItemPropertyRecord

'Usage
 
Dim client As IEasyDAClient
Dim serverDescriptor As ServerDescriptor
Dim nodeDescriptor As DANodeDescriptor
Dim value As DAItemPropertyRecord
 
value = IEasyDAClientExtension2.GetItemPropertyRecord(client, serverDescriptor, nodeDescriptor)

[Extension()]
[NotNull()]
public static DAItemPropertyRecord GetItemPropertyRecord( 
   IEasyDAClient client,
   ServerDescriptor serverDescriptor,
   DANodeDescriptor nodeDescriptor
)

[Extension()]
[NotNull()]
public:
static DAItemPropertyRecord^ GetItemPropertyRecord( 
   IEasyDAClient^ client,
   ServerDescriptor^ serverDescriptor,
   DANodeDescriptor^ nodeDescriptor
)

Parameters

client: The client object that will perform the operation.
serverDescriptor: The OPC server involved in the operation.
nodeDescriptor: The descriptor of the OPC node involved in the operation.

Return Value

Returns a structure containing the OPC property values requested.

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument. 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.
OpcLabs.EasyOpc.OperationModel.OpcException	The OPC "Classic" (or OPC XML-DA) operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause. This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

System.ArgumentNullException

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

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.

OpcLabs.EasyOpc.OperationModel.OpcException

The OPC "Classic" (or OPC XML-DA) operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

Remarks

This method allows you to obtain a structure filled in with property values for a given OPC item. It can retrieve all well-known properties at once, or you can pass in a set of property Ids that you are interested in. You can then simply use the properties in the resulting DAItemPropertyRecord structure, without further looking up the values in any way.

Using implicit conversions, you can pass an item ID in place of node descriptor.

Example

// This example shows how to obtain a structure containing property values for an OPC item, and display some property values.

using System;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.Extensions;
using OpcLabs.EasyOpc.OperationModel;

namespace DocExamples.DataAccess._EasyDAClientExtension
{
    class GetItemPropertyRecord
    {
        public static void Main1()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();

            // Get a structure containing values of all well-known properties
            DAItemPropertyRecord itemPropertyRecord;
            try
            {
                itemPropertyRecord = client.GetItemPropertyRecord("", "OPCLabs.KitServer.2", "Simulation.Random");
            }
            catch (OpcException opcException)
            {
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message);
                return;
            }

            // Display some of the obtained property values
            Console.WriteLine("itemPropertyRecord.AccessRights: {0}", itemPropertyRecord.AccessRights);
            Console.WriteLine("itemPropertyRecord.DataType: {0}", itemPropertyRecord.DataType);
            Console.WriteLine("itemPropertyRecord.Timestamp: {0}", itemPropertyRecord.Timestamp);
        }
    }
}

# This example shows how to obtain a structure containing property values for an OPC item, and display some property
# values.

# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from OpcLabs.EasyOpc.DataAccess import *
from OpcLabs.EasyOpc.DataAccess.Extensions import *
from OpcLabs.EasyOpc.OperationModel import *


# Instantiate the client object.
client = EasyDAClient()

# Get a structure containing values of all well-known properties.
try:
    itemPropertyRecord = IEasyDAClientExtension2.GetItemPropertyRecord(client,
                                                                       '', 'OPCLabs.KitServer.2', 'Simulation.Random')
except OpcException as opcException:
    print('*** Failure: ' + opcException.GetBaseException().Message)
    exit()

# Display some of the obtained property values.
print('itemPropertyRecord.AccessRights: ', itemPropertyRecord.AccessRights, sep='')
print('itemPropertyRecord.DataType: ', itemPropertyRecord.DataType, sep='')
print('itemPropertyRecord.Timestamp: ', itemPropertyRecord.Timestamp, sep='')

print('Finished.')

' This example shows how to obtain a structure containing property values for an OPC item, and display some property values.

Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.Extensions
Imports OpcLabs.EasyOpc.OperationModel

Namespace DataAccess._EasyDAClientExtension
    Friend Class GetItemPropertyRecord
        Public Shared Sub Main1()
            Dim client = New EasyDAClient()

            ' Get a structure containing values of all well-known properties
            Dim itemPropertyRecord As DAItemPropertyRecord
            Try
                itemPropertyRecord = client.GetItemPropertyRecord("", "OPCLabs.KitServer.2", "Simulation.Random")
            Catch opcException As OpcException
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
                Exit Sub
            End Try

            ' Display some of the obtained property values
            Console.WriteLine("itemPropertyRecord.AccessRights: {0}", itemPropertyRecord.AccessRights)
            Console.WriteLine("itemPropertyRecord.DataType: {0}", itemPropertyRecord.DataType)
            Console.WriteLine("itemPropertyRecord.Timestamp: {0}", itemPropertyRecord.Timestamp)
        End Sub
    End Class
End Namespace

CSharp
Python
VB.NET

// This example shows how to obtain a structure containing property values for an OPC item, and display some property values.

using System;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.Extensions;
using OpcLabs.EasyOpc.OperationModel;

namespace DocExamples.DataAccess._EasyDAClientExtension
{
    class GetItemPropertyRecord
    {
        public static void Main1()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();

            // Get a structure containing values of all well-known properties
            DAItemPropertyRecord itemPropertyRecord;
            try
            {
                itemPropertyRecord = client.GetItemPropertyRecord("", "OPCLabs.KitServer.2", "Simulation.Random");
            }
            catch (OpcException opcException)
            {
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message);
                return;
            }

            // Display some of the obtained property values
            Console.WriteLine("itemPropertyRecord.AccessRights: {0}", itemPropertyRecord.AccessRights);
            Console.WriteLine("itemPropertyRecord.DataType: {0}", itemPropertyRecord.DataType);
            Console.WriteLine("itemPropertyRecord.Timestamp: {0}", itemPropertyRecord.Timestamp);
        }
    }
}

# This example shows how to obtain a structure containing property values for an OPC item, and display some property
# values.

# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from OpcLabs.EasyOpc.DataAccess import *
from OpcLabs.EasyOpc.DataAccess.Extensions import *
from OpcLabs.EasyOpc.OperationModel import *


# Instantiate the client object.
client = EasyDAClient()

# Get a structure containing values of all well-known properties.
try:
    itemPropertyRecord = IEasyDAClientExtension2.GetItemPropertyRecord(client,
                                                                       '', 'OPCLabs.KitServer.2', 'Simulation.Random')
except OpcException as opcException:
    print('*** Failure: ' + opcException.GetBaseException().Message)
    exit()

# Display some of the obtained property values.
print('itemPropertyRecord.AccessRights: ', itemPropertyRecord.AccessRights, sep='')
print('itemPropertyRecord.DataType: ', itemPropertyRecord.DataType, sep='')
print('itemPropertyRecord.Timestamp: ', itemPropertyRecord.Timestamp, sep='')

print('Finished.')

' This example shows how to obtain a structure containing property values for an OPC item, and display some property values.

Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.Extensions
Imports OpcLabs.EasyOpc.OperationModel

Namespace DataAccess._EasyDAClientExtension
    Friend Class GetItemPropertyRecord
        Public Shared Sub Main1()
            Dim client = New EasyDAClient()

            ' Get a structure containing values of all well-known properties
            Dim itemPropertyRecord As DAItemPropertyRecord
            Try
                itemPropertyRecord = client.GetItemPropertyRecord("", "OPCLabs.KitServer.2", "Simulation.Random")
            Catch opcException As OpcException
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
                Exit Sub
            End Try

            ' Display some of the obtained property values
            Console.WriteLine("itemPropertyRecord.AccessRights: {0}", itemPropertyRecord.AccessRights)
            Console.WriteLine("itemPropertyRecord.DataType: {0}", itemPropertyRecord.DataType)
            Console.WriteLine("itemPropertyRecord.Timestamp: {0}", itemPropertyRecord.Timestamp)
        End Sub
    End Class
End Namespace

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

IEasyDAClientExtension2 Class
IEasyDAClientExtension2 Members
Overload List

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