OPC Studio User's Guide and Reference
Examples - OPC Data Access - Browse for leaves

.NET

// 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 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._EasyDAClient
{
    class BrowseLeaves
    {
        public static void Main1()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();
            DANodeElementCollection leafElements;
            try
            {
                leafElements = client.BrowseLeaves("", "OPCLabs.KitServer.2", "Simulation");
            }
            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("Register_ArrayOfI2").ItemId: Simulation.Register_ArrayOfI2
        //LeafElements("Register_ArrayOfI4").ItemId: Simulation.Register_ArrayOfI4
        //LeafElements("Staircase 0:2 (10 s)").ItemId: Simulation.Staircase 0:2 (10 s)
        //LeafElements("Constant_VARIANT").ItemId: Simulation.Constant_VARIANT
        //LeafElements("Staircase 0:10 (1 s)").ItemId: Simulation.Staircase 0:10 (1 s)
        //LeafElements("Register_DATE").ItemId: Simulation.Register_DATE
        //LeafElements("Constant_RECORD").ItemId: Simulation.Constant_RECORD
        //LeafElements("ReadValue_DECIMAL").ItemId: Simulation.ReadValue_DECIMAL
        //LeafElements("Ramp 0:360 (1 s)").ItemId: Simulation.Ramp 0:360 (1 s)
        //LeafElements("Constant_NULL").ItemId: Simulation.Constant_NULL
        //LeafElements("ReadValue_ArrayOfUI2").ItemId: Simulation.ReadValue_ArrayOfUI2
        //LeafElements("ReadValue_ArrayOfUI1").ItemId: Simulation.ReadValue_ArrayOfUI1
        //LeafElements("ReadValue_ArrayOfUI4").ItemId: Simulation.ReadValue_ArrayOfUI4
        //LeafElements("Constant_CY").ItemId: Simulation.Constant_CY
        //LeafElements("Staircase 0:2 (1 min)").ItemId: Simulation.Staircase 0:2 (1 min)
        //LeafElements("Staircase 0:2 (10 min)").ItemId: Simulation.Staircase 0:2 (10 min)
        //LeafElements("Square (10 s)").ItemId: Simulation.Square(10 s)
        //LeafElements("Register_ArrayOfBSTR").ItemId: Simulation.Register_ArrayOfBSTR
        //LeafElements("ReadValue_I2").ItemId: Simulation.ReadValue_I2
        //LeafElements("ReadValue_I1").ItemId: Simulation.ReadValue_I1
        //LeafElements("ReadValue_I4").ItemId: Simulation.ReadValue_I4
        //LeafElements("Ramp (1 s)").ItemId: Simulation.Ramp(1 s)
        //LeafElements("ReadValue_ArrayOfDATE").ItemId: Simulation.ReadValue_ArrayOfDATE
        //LeafElements("OnOff (1 s)").ItemId: Simulation.OnOff(1 s)
        //LeafElements("AlternatingQuality Uncertain (1 s)").ItemId: Simulation.AlternatingQuality Uncertain(1 s)
        //LeafElements("Register_NULL").ItemId: Simulation.Register_NULL
        //LeafElements("Random (1 min)").ItemId: Simulation.Random(1 min)
        //LeafElements("Random (10 min)").ItemId: Simulation.Random(10 min)
        //LeafElements("AlternatingError (10 s)").ItemId: Simulation.AlternatingError(10 s)
        //LeafElements("ReadValue_ArrayOfI1").ItemId: Simulation.ReadValue_ArrayOfI1
        //LeafElements("ReadValue_ArrayOfI2").ItemId: Simulation.ReadValue_ArrayOfI2
        //LeafElements("ReadValue_UI2").ItemId: Simulation.ReadValue_UI2
        //LeafElements("ReadValue_ArrayOfI4").ItemId: Simulation.ReadValue_ArrayOfI4
        //LeafElements("ReadValue_UI1").ItemId: Simulation.ReadValue_UI1
        //LeafElements("ReadValue_UI4").ItemId: Simulation.ReadValue_UI4
        //LeafElements("Weekdays (1 s)").ItemId: Simulation.Weekdays(1 s)
        //LeafElements("AlternatingQuality Uncertain (1 min)").ItemId: Simulation.AlternatingQuality Uncertain(1 min)
        //LeafElements("AlternatingQuality Uncertain (10 min)").ItemId: Simulation.AlternatingQuality Uncertain(10 min)
        //LeafElements("Weekdays (1 min)").ItemId: Simulation.Weekdays(1 min)
        //LeafElements("Weekdays (10 min)").ItemId: Simulation.Weekdays(10 min)
        //LeafElements("OnOff (10 s)").ItemId: Simulation.OnOff(10 s)
        //LeafElements("ReadWriteCount").ItemId: Simulation.ReadWriteCount
        //LeafElements("Register_UNKNOWN").ItemId: Simulation.Register_UNKNOWN
        //LeafElements("AlternatingQuality Uncertain (10 s)").ItemId: Simulation.AlternatingQuality Uncertain(10 s)
        //LeafElements("Constant_BSTR").ItemId: Simulation.Constant_BSTR
        //LeafElements("Constant_ERROR").ItemId: Simulation.Constant_ERROR
        //LeafElements("Constant_UI2").ItemId: Simulation.Constant_UI2
        //LeafElements("Constant_UI1").ItemId: Simulation.Constant_UI1
        //LeafElements("Constant_UI4").ItemId: Simulation.Constant_UI4
        //LeafElements("Constant_R4").ItemId: Simulation.Constant_R4
        //LeafElements("Constant_R8").ItemId: Simulation.Constant_R8
        //LeafElements("ReadValue_ArrayOfBSTR").ItemId: Simulation.ReadValue_ArrayOfBSTR
        //LeafElements("Register_ArrayOfR4").ItemId: Simulation.Register_ArrayOfR4
        //LeafElements("Register_ArrayOfR8").ItemId: Simulation.Register_ArrayOfR8
        //LeafElements("Ramp 0:360 (1 min)").ItemId: Simulation.Ramp 0:360 (1 min)
        //LeafElements("Ramp 0:360 (10 min)").ItemId: Simulation.Ramp 0:360 (10 min)
        //LeafElements("RegisterSet_n").ItemId: 
        //LeafElements("Register_ArrayOfUI4").ItemId: Simulation.Register_ArrayOfUI4
        //LeafElements("Register_ArrayOfUI1").ItemId: Simulation.Register_ArrayOfUI1
        //LeafElements("Register_ArrayOfUI2").ItemId: Simulation.Register_ArrayOfUI2
        //LeafElements("Register").ItemId: Simulation.Register
        //LeafElements("Constant_EMPTY").ItemId: Simulation.Constant_EMPTY
        //LeafElements("Register_RECORD").ItemId: Simulation.Register_RECORD
        //LeafElements("ReadValue_ArrayOfBOOL").ItemId: Simulation.ReadValue_ArrayOfBOOL
        //LeafElements("AlternatingError (1 min)").ItemId: Simulation.AlternatingError(1 min)
        //LeafElements("AlternatingError (10 min)").ItemId: Simulation.AlternatingError(10 min)
        //LeafElements("OnOff (1 min)").ItemId: Simulation.OnOff(1 min)
        //LeafElements("ReadValue_DATE").ItemId: Simulation.ReadValue_DATE
        //LeafElements("Register_ERROR").ItemId: Simulation.Register_ERROR
        //LeafElements("ReadValue_ArrayOfUINT").ItemId: Simulation.ReadValue_ArrayOfUINT
        //LeafElements("Incrementing (10 s)").ItemId: Simulation.Incrementing(10 s)
        //LeafElements("ReadValue_ArrayOfINT").ItemId: Simulation.ReadValue_ArrayOfINT
        //LeafElements("ReadValue_BOOL").ItemId: Simulation.ReadValue_BOOL
        //LeafElements("Register_ArrayOfCY").ItemId: Simulation.Register_ArrayOfCY
        //LeafElements("Incrementing (1 s)").ItemId: Simulation.Incrementing(1 s)
        //LeafElements("Constant_UINT").ItemId: Simulation.Constant_UINT
        //LeafElements("ReadValue_ArrayOfR4").ItemId: Simulation.ReadValue_ArrayOfR4
        //LeafElements("ReadValue_ArrayOfR8").ItemId: Simulation.ReadValue_ArrayOfR8
        //LeafElements("Constant_I4").ItemId: Simulation.Constant_I4
        //LeafElements("Constant_I2").ItemId: Simulation.Constant_I2
        //LeafElements("Constant_I1").ItemId: Simulation.Constant_I1
        //LeafElements("Register_BOOL").ItemId: Simulation.Register_BOOL
        //LeafElements("Constant_UNKNOWN").ItemId: Simulation.Constant_UNKNOWN
        //LeafElements("Ramp 0:100 (1 s)").ItemId: Simulation.Ramp 0:100 (1 s)
        //LeafElements("Register_UI4").ItemId: Simulation.Register_UI4
        //LeafElements("Register_UI2").ItemId: Simulation.Register_UI2
        //LeafElements("Register_UI1").ItemId: Simulation.Register_UI1
        //LeafElements("AlternatingError (1 s)").ItemId: Simulation.AlternatingError(1 s)
        //LeafElements("Sine (10 s)").ItemId: Simulation.Sine(10 s)
        //LeafElements("Constant_BOOL").ItemId: Simulation.Constant_BOOL
        //LeafElements("Sine -100:100 (10 s)").ItemId: Simulation.Sine -100:100 (10 s)
        //LeafElements("Register_UINT").ItemId: Simulation.Register_UINT
        //LeafElements("Constant").ItemId: Simulation.Constant
        //LeafElements("Sine (1 s)").ItemId: Simulation.Sine(1 s)
        //LeafElements("Register_I1").ItemId: Simulation.Register_I1
        //LeafElements("Register_I2").ItemId: Simulation.Register_I2
        //LeafElements("Register_I4").ItemId: Simulation.Register_I4
        //LeafElements("ReadValue_ArrayOfCY").ItemId: Simulation.ReadValue_ArrayOfCY
        //LeafElements("Register_ArrayOfUINT").ItemId: Simulation.Register_ArrayOfUINT
        //LeafElements("Incrementing (1 min)").ItemId: Simulation.Incrementing(1 min)
        //LeafElements("Weekdays (10 s)").ItemId: Simulation.Weekdays(10 s)
        //LeafElements("Square (1 s)").ItemId: Simulation.Square(1 s)
        //LeafElements("Sine (1 min)").ItemId: Simulation.Sine(1 min)
        //LeafElements("Sine (10 min)").ItemId: Simulation.Sine(10 min)
        //LeafElements("Constant_DISPATCH").ItemId: Simulation.Constant_DISPATCH
        //LeafElements("Ramp 0:100 (1 min)").ItemId: Simulation.Ramp 0:100 (1 min)
        //LeafElements("Ramp 0:100 (10 min)").ItemId: Simulation.Ramp 0:100 (10 min)
        //LeafElements("Random (1 s)").ItemId: Simulation.Random(1 s)
        //LeafElements("Staircase 0:10 (1 min)").ItemId: Simulation.Staircase 0:10 (1 min)
        //LeafElements("Staircase 0:10 (10 min)").ItemId: Simulation.Staircase 0:10 (10 min)
        //LeafElements("AlternatingQuality Bad (1 s)").ItemId: Simulation.AlternatingQuality Bad(1 s)
        //LeafElements("Sine -100:100 (1 s)").ItemId: Simulation.Sine -100:100 (1 s)
        //LeafElements("Register_ArrayOfDATE").ItemId: Simulation.Register_ArrayOfDATE
        //LeafElements("AlternatingQuality Bad (10 s)").ItemId: Simulation.AlternatingQuality Bad(10 s)
        //LeafElements("ReadValue_R4").ItemId: Simulation.ReadValue_R4
        //LeafElements("ReadValue_R8").ItemId: Simulation.ReadValue_R8
        //LeafElements("Ramp (1 min)").ItemId: Simulation.Ramp(1 min)
        //LeafElements("Ramp (10 min)").ItemId: Simulation.Ramp(10 min)
        //LeafElements("Register_DISPATCH").ItemId: Simulation.Register_DISPATCH
        //LeafElements("OnOff (10 min)").ItemId: Simulation.OnOff(10 min)
        //LeafElements("ReadValue_BSTR").ItemId: Simulation.ReadValue_BSTR
        //LeafElements("Staircase 0:10 (10 s)").ItemId: Simulation.Staircase 0:10 (10 s)
        //LeafElements("Random (10 s)").ItemId: Simulation.Random(10 s)
        //LeafElements("Incrementing").ItemId: Simulation.Incrementing
        //LeafElements("Register_BSTR").ItemId: Simulation.Register_BSTR
        //LeafElements("ReadValue_UINT").ItemId: Simulation.ReadValue_UINT
        //LeafElements("Register_CY").ItemId: Simulation.Register_CY
        //LeafElements("AlternatingQuality Bad (1 min)").ItemId: Simulation.AlternatingQuality Bad(1 min)
        //LeafElements("AlternatingQuality Bad (10 min)").ItemId: Simulation.AlternatingQuality Bad(10 min)
        //LeafElements("Random").ItemId: Simulation.Random
        //LeafElements("Sine -100:100 (1 min)").ItemId: Simulation.Sine -100:100 (1 min)
        //LeafElements("Sine -100:100 (10 min)").ItemId: Simulation.Sine -100:100 (10 min)
        //LeafElements("Ramp (10 s)").ItemId: Simulation.Ramp(10 s)
        //LeafElements("ReadValue_INT").ItemId: Simulation.ReadValue_INT
        //LeafElements("Staircase 0:2 (1 s)").ItemId: Simulation.Staircase 0:2 (1 s)
        //LeafElements("ReadValue_CY").ItemId: Simulation.ReadValue_CY
        //LeafElements("Register_R8").ItemId: Simulation.Register_R8
        //LeafElements("Register_R4").ItemId: Simulation.Register_R4
        //LeafElements("Register_DECIMAL").ItemId: Simulation.Register_DECIMAL
        //LeafElements("Incrementing (10 min)").ItemId: Simulation.Incrementing(10 min)
        //LeafElements("Register_EMPTY").ItemId: Simulation.Register_EMPTY
        //LeafElements("Constant_INT").ItemId: Simulation.Constant_INT
        //LeafElements("Register_INT").ItemId: Simulation.Register_INT
        //LeafElements("Register_ArrayOfBOOL").ItemId: Simulation.Register_ArrayOfBOOL
        //LeafElements("Ramp 0:100 (10 s)").ItemId: Simulation.Ramp 0:100 (10 s)
        //LeafElements("Ramp 0:360 (10 s)").ItemId: Simulation.Ramp 0:360 (10 s)
        //LeafElements("Square (1 min)").ItemId: Simulation.Square(1 min)
        //LeafElements("Square (10 min)").ItemId: Simulation.Square(10 min)
        //LeafElements("Constant_DECIMAL").ItemId: Simulation.Constant_DECIMAL
        //LeafElements("Register_VARIANT").ItemId: Simulation.Register_VARIANT
        //LeafElements("Constant_DATE").ItemId: Simulation.Constant_DATE
        //LeafElements("Register_ArrayOfINT").ItemId: Simulation.Register_ArrayOfINT
    }
}
' 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 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._EasyDAClient
    Partial Friend Class BrowseLeaves
        Shared Sub Main1()
            Dim client = New EasyDAClient()

            Dim leafElements As DANodeElementCollection
            Try
                leafElements = client.BrowseLeaves("", "OPCLabs.KitServer.2", "Simulation")
            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("Register_ArrayOfI2").ItemId: Simulation.Register_ArrayOfI2
        'LeafElements("Register_ArrayOfI4").ItemId: Simulation.Register_ArrayOfI4
        'LeafElements("Staircase 0:2 (10 s)").ItemId: Simulation.Staircase 0:2 (10 s)
        'LeafElements("Constant_VARIANT").ItemId: Simulation.Constant_VARIANT
        'LeafElements("Staircase 0:10 (1 s)").ItemId: Simulation.Staircase 0:10 (1 s)
        'LeafElements("Register_DATE").ItemId: Simulation.Register_DATE
        'LeafElements("Constant_RECORD").ItemId: Simulation.Constant_RECORD
        'LeafElements("ReadValue_DECIMAL").ItemId: Simulation.ReadValue_DECIMAL
        'LeafElements("Ramp 0:360 (1 s)").ItemId: Simulation.Ramp 0:360 (1 s)
        'LeafElements("Constant_NULL").ItemId: Simulation.Constant_NULL
        'LeafElements("ReadValue_ArrayOfUI2").ItemId: Simulation.ReadValue_ArrayOfUI2
        'LeafElements("ReadValue_ArrayOfUI1").ItemId: Simulation.ReadValue_ArrayOfUI1
        'LeafElements("ReadValue_ArrayOfUI4").ItemId: Simulation.ReadValue_ArrayOfUI4
        'LeafElements("Constant_CY").ItemId: Simulation.Constant_CY
        'LeafElements("Staircase 0:2 (1 min)").ItemId: Simulation.Staircase 0:2 (1 min)
        'LeafElements("Staircase 0:2 (10 min)").ItemId: Simulation.Staircase 0:2 (10 min)
        'LeafElements("Square (10 s)").ItemId: Simulation.Square(10 s)
        'LeafElements("Register_ArrayOfBSTR").ItemId: Simulation.Register_ArrayOfBSTR
        'LeafElements("ReadValue_I2").ItemId: Simulation.ReadValue_I2
        'LeafElements("ReadValue_I1").ItemId: Simulation.ReadValue_I1
        'LeafElements("ReadValue_I4").ItemId: Simulation.ReadValue_I4
        'LeafElements("Ramp (1 s)").ItemId: Simulation.Ramp(1 s)
        'LeafElements("ReadValue_ArrayOfDATE").ItemId: Simulation.ReadValue_ArrayOfDATE
        'LeafElements("OnOff (1 s)").ItemId: Simulation.OnOff(1 s)
        'LeafElements("AlternatingQuality Uncertain (1 s)").ItemId: Simulation.AlternatingQuality Uncertain(1 s)
        'LeafElements("Register_NULL").ItemId: Simulation.Register_NULL
        'LeafElements("Random (1 min)").ItemId: Simulation.Random(1 min)
        'LeafElements("Random (10 min)").ItemId: Simulation.Random(10 min)
        'LeafElements("AlternatingError (10 s)").ItemId: Simulation.AlternatingError(10 s)
        'LeafElements("ReadValue_ArrayOfI1").ItemId: Simulation.ReadValue_ArrayOfI1
        'LeafElements("ReadValue_ArrayOfI2").ItemId: Simulation.ReadValue_ArrayOfI2
        'LeafElements("ReadValue_UI2").ItemId: Simulation.ReadValue_UI2
        'LeafElements("ReadValue_ArrayOfI4").ItemId: Simulation.ReadValue_ArrayOfI4
        'LeafElements("ReadValue_UI1").ItemId: Simulation.ReadValue_UI1
        'LeafElements("ReadValue_UI4").ItemId: Simulation.ReadValue_UI4
        'LeafElements("Weekdays (1 s)").ItemId: Simulation.Weekdays(1 s)
        'LeafElements("AlternatingQuality Uncertain (1 min)").ItemId: Simulation.AlternatingQuality Uncertain(1 min)
        'LeafElements("AlternatingQuality Uncertain (10 min)").ItemId: Simulation.AlternatingQuality Uncertain(10 min)
        'LeafElements("Weekdays (1 min)").ItemId: Simulation.Weekdays(1 min)
        'LeafElements("Weekdays (10 min)").ItemId: Simulation.Weekdays(10 min)
        'LeafElements("OnOff (10 s)").ItemId: Simulation.OnOff(10 s)
        'LeafElements("ReadWriteCount").ItemId: Simulation.ReadWriteCount
        'LeafElements("Register_UNKNOWN").ItemId: Simulation.Register_UNKNOWN
        'LeafElements("AlternatingQuality Uncertain (10 s)").ItemId: Simulation.AlternatingQuality Uncertain(10 s)
        'LeafElements("Constant_BSTR").ItemId: Simulation.Constant_BSTR
        'LeafElements("Constant_ERROR").ItemId: Simulation.Constant_ERROR
        'LeafElements("Constant_UI2").ItemId: Simulation.Constant_UI2
        'LeafElements("Constant_UI1").ItemId: Simulation.Constant_UI1
        'LeafElements("Constant_UI4").ItemId: Simulation.Constant_UI4
        'LeafElements("Constant_R4").ItemId: Simulation.Constant_R4
        'LeafElements("Constant_R8").ItemId: Simulation.Constant_R8
        'LeafElements("ReadValue_ArrayOfBSTR").ItemId: Simulation.ReadValue_ArrayOfBSTR
        'LeafElements("Register_ArrayOfR4").ItemId: Simulation.Register_ArrayOfR4
        'LeafElements("Register_ArrayOfR8").ItemId: Simulation.Register_ArrayOfR8
        'LeafElements("Ramp 0:360 (1 min)").ItemId: Simulation.Ramp 0:360 (1 min)
        'LeafElements("Ramp 0:360 (10 min)").ItemId: Simulation.Ramp 0:360 (10 min)
        'LeafElements("RegisterSet_n").ItemId: 
        'LeafElements("Register_ArrayOfUI4").ItemId Simulation.Register_ArrayOfUI4
        'LeafElements("Register_ArrayOfUI1").ItemId: Simulation.Register_ArrayOfUI1
        'LeafElements("Register_ArrayOfUI2").ItemId: Simulation.Register_ArrayOfUI2
        'LeafElements("Register").ItemId: Simulation.Register
        'LeafElements("Constant_EMPTY").ItemId: Simulation.Constant_EMPTY
        'LeafElements("Register_RECORD").ItemId: Simulation.Register_RECORD
        'LeafElements("ReadValue_ArrayOfBOOL").ItemId: Simulation.ReadValue_ArrayOfBOOL
        'LeafElements("AlternatingError (1 min)").ItemId: Simulation.AlternatingError(1 min)
        'LeafElements("AlternatingError (10 min)").ItemId: Simulation.AlternatingError(10 min)
        'LeafElements("OnOff (1 min)").ItemId: Simulation.OnOff(1 min)
        'LeafElements("ReadValue_DATE").ItemId: Simulation.ReadValue_DATE
        'LeafElements("Register_ERROR").ItemId: Simulation.Register_ERROR
        'LeafElements("ReadValue_ArrayOfUINT").ItemId: Simulation.ReadValue_ArrayOfUINT
        'LeafElements("Incrementing (10 s)").ItemId: Simulation.Incrementing(10 s)
        'LeafElements("ReadValue_ArrayOfINT").ItemId: Simulation.ReadValue_ArrayOfINT
        'LeafElements("ReadValue_BOOL").ItemId: Simulation.ReadValue_BOOL
        'LeafElements("Register_ArrayOfCY").ItemId: Simulation.Register_ArrayOfCY
        'LeafElements("Incrementing (1 s)").ItemId: Simulation.Incrementing(1 s)
        'LeafElements("Constant_UINT").ItemId: Simulation.Constant_UINT
        'LeafElements("ReadValue_ArrayOfR4").ItemId: Simulation.ReadValue_ArrayOfR4
        'LeafElements("ReadValue_ArrayOfR8").ItemId: Simulation.ReadValue_ArrayOfR8
        'LeafElements("Constant_I4").ItemId: Simulation.Constant_I4
        'LeafElements("Constant_I2").ItemId: Simulation.Constant_I2
        'LeafElements("Constant_I1").ItemId: Simulation.Constant_I1
        'LeafElements("Register_BOOL").ItemId: Simulation.Register_BOOL
        'LeafElements("Constant_UNKNOWN").ItemId: Simulation.Constant_UNKNOWN
        'LeafElements("Ramp 0:100 (1 s)").ItemId: Simulation.Ramp 0:100 (1 s)
        'LeafElements("Register_UI4").ItemId: Simulation.Register_UI4
        'LeafElements("Register_UI2").ItemId: Simulation.Register_UI2
        'LeafElements("Register_UI1").ItemId: Simulation.Register_UI1
        'LeafElements("AlternatingError (1 s)").ItemId: Simulation.AlternatingError(1 s)
        'LeafElements("Sine (10 s)").ItemId: Simulation.Sine(10 s)
        'LeafElements("Constant_BOOL").ItemId: Simulation.Constant_BOOL
        'LeafElements("Sine -100:100 (10 s)").ItemId: Simulation.Sine -100:100 (10 s)
        'LeafElements("Register_UINT").ItemId: Simulation.Register_UINT
        'LeafElements("Constant").ItemId: Simulation.Constant
        'LeafElements("Sine (1 s)").ItemId: Simulation.Sine(1 s)
        'LeafElements("Register_I1").ItemId: Simulation.Register_I1
        'LeafElements("Register_I2").ItemId: Simulation.Register_I2
        'LeafElements("Register_I4").ItemId: Simulation.Register_I4
        'LeafElements("ReadValue_ArrayOfCY").ItemId: Simulation.ReadValue_ArrayOfCY
        'LeafElements("Register_ArrayOfUINT").ItemId: Simulation.Register_ArrayOfUINT
        'LeafElements("Incrementing (1 min)").ItemId: Simulation.Incrementing(1 min)
        'LeafElements("Weekdays (10 s)").ItemId: Simulation.Weekdays(10 s)
        'LeafElements("Square (1 s)").ItemId: Simulation.Square(1 s)
        'LeafElements("Sine (1 min)").ItemId: Simulation.Sine(1 min)
        'LeafElements("Sine (10 min)").ItemId: Simulation.Sine(10 min)
        'LeafElements("Constant_DISPATCH").ItemId: Simulation.Constant_DISPATCH
        'LeafElements("Ramp 0:100 (1 min)").ItemId: Simulation.Ramp 0:100 (1 min)
        'LeafElements("Ramp 0:100 (10 min)").ItemId: Simulation.Ramp 0:100 (10 min)
        'LeafElements("Random (1 s)").ItemId: Simulation.Random(1 s)
        'LeafElements("Staircase 0:10 (1 min)").ItemId: Simulation.Staircase 0:10 (1 min)
        'LeafElements("Staircase 0:10 (10 min)").ItemId: Simulation.Staircase 0:10 (10 min)
        'LeafElements("AlternatingQuality Bad (1 s)").ItemId: Simulation.AlternatingQuality Bad(1 s)
        'LeafElements("Sine -100:100 (1 s)").ItemId: Simulation.Sine -100:100 (1 s)
        'LeafElements("Register_ArrayOfDATE").ItemId: Simulation.Register_ArrayOfDATE
        'LeafElements("AlternatingQuality Bad (10 s)").ItemId: Simulation.AlternatingQuality Bad(10 s)
        'LeafElements("ReadValue_R4").ItemId: Simulation.ReadValue_R4
        'LeafElements("ReadValue_R8").ItemId: Simulation.ReadValue_R8
        'LeafElements("Ramp (1 min)").ItemId: Simulation.Ramp(1 min)
        'LeafElements("Ramp (10 min)").ItemId: Simulation.Ramp(10 min)
        'LeafElements("Register_DISPATCH").ItemId: Simulation.Register_DISPATCH
        'LeafElements("OnOff (10 min)").ItemId: Simulation.OnOff(10 min)
        'LeafElements("ReadValue_BSTR").ItemId: Simulation.ReadValue_BSTR
        'LeafElements("Staircase 0:10 (10 s)").ItemId: Simulation.Staircase 0:10 (10 s)
        'LeafElements("Random (10 s)").ItemId: Simulation.Random(10 s)
        'LeafElements("Incrementing").ItemId: Simulation.Incrementing
        'LeafElements("Register_BSTR").ItemId: Simulation.Register_BSTR
        'LeafElements("ReadValue_UINT").ItemId: Simulation.ReadValue_UINT
        'LeafElements("Register_CY").ItemId: Simulation.Register_CY
        'LeafElements("AlternatingQuality Bad (1 min)").ItemId: Simulation.AlternatingQuality Bad(1 min)
        'LeafElements("AlternatingQuality Bad (10 min)").ItemId: Simulation.AlternatingQuality Bad(10 min)
        'LeafElements("Random").ItemId: Simulation.Random
        'LeafElements("Sine -100:100 (1 min)").ItemId: Simulation.Sine -100:100 (1 min)
        'LeafElements("Sine -100:100 (10 min)").ItemId: Simulation.Sine -100:100 (10 min)
        'LeafElements("Ramp (10 s)").ItemId: Simulation.Ramp(10 s)
        'LeafElements("ReadValue_INT").ItemId: Simulation.ReadValue_INT
        'LeafElements("Staircase 0:2 (1 s)").ItemId: Simulation.Staircase 0:2 (1 s)
        'LeafElements("ReadValue_CY").ItemId: Simulation.ReadValue_CY
        'LeafElements("Register_R8").ItemId: Simulation.Register_R8
        'LeafElements("Register_R4").ItemId: Simulation.Register_R4
        'LeafElements("Register_DECIMAL").ItemId: Simulation.Register_DECIMAL
        'LeafElements("Incrementing (10 min)").ItemId: Simulation.Incrementing(10 min)
        'LeafElements("Register_EMPTY").ItemId: Simulation.Register_EMPTY
        'LeafElements("Constant_INT").ItemId: Simulation.Constant_INT
        'LeafElements("Register_INT").ItemId: Simulation.Register_INT
        'LeafElements("Register_ArrayOfBOOL").ItemId: Simulation.Register_ArrayOfBOOL
        'LeafElements("Ramp 0:100 (10 s)").ItemId: Simulation.Ramp 0:100 (10 s)
        'LeafElements("Ramp 0:360 (10 s)").ItemId: Simulation.Ramp 0:360 (10 s)
        'LeafElements("Square (1 min)").ItemId: Simulation.Square(1 min)
        'LeafElements("Square (10 min)").ItemId: Simulation.Square(10 min)
        'LeafElements("Constant_DECIMAL").ItemId: Simulation.Constant_DECIMAL
        'LeafElements("Register_VARIANT").ItemId: Simulation.Register_VARIANT
        'LeafElements("Constant_DATE").ItemId: Simulation.Constant_DATE
        'LeafElements("Register_ArrayOfINT").ItemId: Simulation.Register_ArrayOfINT

    End Class
End Namespace

COM

Rem This example shows how to obtain all leaves under the "Simulation" branch of the address space. For each leaf, it displays 
Rem the ItemID of the node.
Rem
Rem Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
Rem OPC client and subscriber examples in VBScript on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBScript .
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 Client: Set Client = CreateObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient")
On Error Resume Next
Dim LeafElements: Set LeafElements = Client.BrowseLeaves("", "OPCLabs.KitServer.2", "Simulation")
If Err.Number <> 0 Then
    WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description
    WScript.Quit
End If
On Error Goto 0

Dim LeafElement: For Each LeafElement In LeafElements
    WScript.Echo "LeafElements(""" & LeafElement.Name & """).ItemId: " & LeafElement.ItemId
Next

Python

# 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 .
# 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.DataAccess import *
from OpcLabs.EasyOpc.OperationModel import *


# Instantiate the client object.
client = EasyDAClient()

# Perform the operation.
try:
    nodeElements = IEasyDAClientExtension.BrowseLeaves(client, '', 'OPCLabs.KitServer.2', 'Simulation')
except OpcException as opcException:
    print('*** Failure: ' + opcException.GetBaseException().Message)
    exit()

# Display results.
for nodeElement in nodeElements:
    print('NodeElements["', nodeElement.Name, '"].ItemId: ', nodeElement.ItemId, sep='')

 

See Also

Concepts

Examples - Client OPC Unified Architecture

Examples - Client OPC XML-DA