Examples - OPC XML-DA - Browse for leaves

// This example shows how to obtain all leaves under the "Simulation" branch of the address space. For each leaf, it displays 
// the ItemID of the node.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .

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

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

            foreach (DANodeElement leafElement in leafElements)
                Console.WriteLine($"LeafElements(\"{leafElement.Name}\").ItemId: {leafElement.ItemId}");
        }


        // Example output:
        //
        //LeafElements("Int").ItemId: Static/Analog Types/Int
        //LeafElements("Double").ItemId: Static/Analog Types/Double
        //LeafElements("Int[]").ItemId: Static/Analog Types/Int[]
        //LeafElements("Double[]").ItemId: Static/Analog Types/Double[]
    }
}

# This example shows how to obtain all leaves under the "Simulation" branch of the address space. For each leaf, it displays 
# the ItemID of the node.
#
# 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 .
# 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 *
from OpcLabs.EasyOpc.DataAccess.AddressSpace import *
from OpcLabs.EasyOpc.OperationModel import *

# Instantiate the client object.
client = EasyDAClient()

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

for leafElement in leafElements:
    print('LeafElements("', leafElement.Name, '").ItemId: ', leafElement.ItemId, sep='')

# Example output:
#
#LeafElements("Int").ItemId: Static/Analog Types/Int
#LeafElements("Double").ItemId: Static/Analog Types/Double
#LeafElements("Int[]").ItemId: Static/Analog Types/Int[]
#LeafElements("Double[]").ItemId: Static/Analog Types/Double[]

' This example shows how to obtain all leaves under the "Simulation" branch of the address space. For each leaf, it displays 
' the ItemID of the node.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .

Imports OpcLabs.EasyOpc
Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.DataAccess.AddressSpace
Imports OpcLabs.EasyOpc.OperationModel

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

            Dim leafElements As DANodeElementCollection
            Try
                Dim serverDescriptor As ServerDescriptor = "http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx"
                leafElements = client.BrowseLeaves(serverDescriptor, "Static/Analog Types")
            Catch opcException As OpcException
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
                Exit Sub
            End Try

            For Each leafElement In leafElements
                Console.WriteLine($"LeafElements(""{leafElement.Name}"").ItemId: {leafElement.ItemId}")
            Next leafElement

        End Sub

        ' Example output
        '
        'LeafElements("Int").ItemId: Static/Analog Types/Int
        'LeafElements("Double").ItemId: Static/Analog Types/Double
        'LeafElements("Int[]").ItemId: Static/Analog Types/Int[]
        'LeafElements("Double[]").ItemId: Static/Analog Types/Double[]

    End Class
End Namespace

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

Examples - OPC Data Access

Examples - OPC Unified Architecture

Conceptual