OPC Studio User's Guide and Reference
Examples - OPC XML-DA - Browse for properties

.NET

// This example shows how to enumerate all properties of an OPC XML-DA item. For each property, it displays its Id and description.
//
// 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.DataAccess;
using OpcLabs.EasyOpc.DataAccess.AddressSpace;
using OpcLabs.EasyOpc.OperationModel;

namespace DocExamples.DataAccess.Xml
{
    class BrowseProperties
    {
        public static void Main1Xml()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();
            DAPropertyElementCollection propertyElements;
            try
            {
                propertyElements = client.BrowseProperties("http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx", "Dynamic/Analog Types/Int");
            }
            catch (OpcException opcException)
            {
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message);
                return;
            }

            foreach (DAPropertyElement propertyElement in propertyElements)
                Console.WriteLine($"PropertyElements(\"{propertyElement.PropertyId.NumericalValue}\").Description: {propertyElement.Description}");
        }


        // Example output:
        //
        //PropertyElements("1").Description: Item Canonical DataType
        //PropertyElements("2").Description: Item Value
        //PropertyElements("3").Description: Item Quality
        //PropertyElements("4").Description: Item Timestamp
        //PropertyElements("5").Description: Item Access Rights
        //PropertyElements("6").Description: Server Scan Rate
        //PropertyElements("7").Description: Item EU Type
        //PropertyElements("8").Description: Item EU Info
        //PropertyElements("102").Description: High EU
        //PropertyElements("103").Description: Low EU
    }
}
' This example shows how to enumerate all properties of an OPC XML-DA item. For each property, it displays its Id and description.
'
' 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.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.AddressSpace
Imports OpcLabs.EasyOpc.OperationModel

Namespace DataAccess.Xml
    Partial Friend Class BrowseProperties
        Shared Sub Main1Xml()
            Dim client = New EasyDAClient()

            Dim propertyElements As DAPropertyElementCollection
            Try
                propertyElements = client.BrowseProperties("http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx", "Dynamic/Analog Types/Int")
            Catch opcException As OpcException
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
                Exit Sub
            End Try

            For Each propertyElement In propertyElements
                Console.WriteLine($"PropertyElements(""{propertyElement.PropertyId.NumericalValue}"").Description: {propertyElement.Description}")
            Next propertyElement

        End Sub

        ' Example output
        '
        'PropertyElements("1").Description: Item Canonical DataType
        'PropertyElements("2").Description: Item Value
        'PropertyElements("3").Description: Item Quality
        'PropertyElements("4").Description: Item Timestamp
        'PropertyElements("5").Description: Item Access Rights
        'PropertyElements("6").Description: Server Scan Rate
        'PropertyElements("7").Description: Item EU Type
        'PropertyElements("8").Description: Item EU Info
        'PropertyElements("102").Description: High EU
        'PropertyElements("103").Description: Low EU
    End Class
End Namespace

Python

# This example shows how to enumerate all properties of an OPC XML-DA item. For each property, it displays its Id and description.
#
# 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 .NET namespaces.
from OpcLabs.EasyOpc import *
from OpcLabs.EasyOpc.DataAccess import *

# Instantiate the client object.
client = EasyDAClient()

try:
    propertyElements = client.BrowseProperties(ServerDescriptor('http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx'), DANodeDescriptor('Dynamic/Analog Types/Int'))
except OpcException as opcException:
    print('*** Failure: ' + opcException.GetBaseException().Message, sep='')
    exit()

for propertyElement in propertyElements:
    print('PropertyElements("', propertyElement.PropertyId.NumericalValue, '").Description: ', propertyElement.Description, sep='')

# Example output:
#
#PropertyElements("1").Description: Item Canonical DataType
#PropertyElements("2").Description: Item Value
#PropertyElements("3").Description: Item Quality
#PropertyElements("4").Description: Item Timestamp
#PropertyElements("5").Description: Item Access Rights
#PropertyElements("6").Description: Server Scan Rate
#PropertyElements("7").Description: Item EU Type
#PropertyElements("8").Description: Item EU Info
#PropertyElements("102").Description: High EU
#PropertyElements("103").Description: Low EU

 

QuickOPC supports OPC XML-DA also on Linux and macOS.
See Also

Examples - Client OPC Data Access

Examples - Client OPC Unified Architecture

Concepts