Examples - OPC Unified Architecture

.NET

// This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
// For each node, it displays its browse name and node ID.
//
// 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.UA;
using OpcLabs.EasyOpc.UA.AddressSpace;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples._EasyUAClient
{
    class BrowseMethods
    {
        public static void Overload2()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object
            var client = new EasyUAClient();

            // Obtain methods under the specified node.
            UANodeElementCollection nodeElementCollection;
            try
            {
                nodeElementCollection = client.BrowseMethods(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10755");
            }
            catch (UAException uaException)
            {
                Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}");
                return;
            }

            // Display results
            foreach (UANodeElement nodeElement in nodeElementCollection)
                Console.WriteLine($"{nodeElement.BrowseName}: {nodeElement.NodeId}");
        }

        // Example output:
        //ScalarMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10756
        //ScalarMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10759
        //ScalarMethod3: nsu = http://test.org/UA/Data/ ;ns=2;i=10762
        //ArrayMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10765
        //ArrayMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10768
        //ArrayMethod3: nsu = http://test.org/UA/Data/ ;ns=2;i=10771
        //UserScalarMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10774
        //UserScalarMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10777
        //UserArrayMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10780
        //UserArrayMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10783
    }
}

# This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
# For each node, it displays its browse name and node ID.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in PowerShell on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PowerShell .
# 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.

#requires -Version 5.1
using namespace OpcLabs.EasyOpc.UA
using namespace OpcLabs.EasyOpc.UA.OperationModel

# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUA.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUAComponents.dll"

[UAEndpointDescriptor]$endpointDescriptor =
    "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
# or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
# or "https://opcua.demo-this.com:51212/UA/SampleServer/"

# Instantiate the client object.
$client = New-Object EasyUAClient

# Obtain methods under the specified node.
try {
    $nodeElementCollection = [IEasyUAClientExtension]::BrowseMethods($client, 
        $endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10755")
}
catch [UAException] {
    Write-Host "*** Failure: $($PSItem.Exception.GetBaseException().Message)"
    return
}

# Display results
foreach ($nodeElement in $nodeElementCollection) {
    Write-Host "$($nodeElement.BrowseName): $($nodeElement.NodeId)"
}


# Example output:
#
#ScalarMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10756
#ScalarMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10759
#ScalarMethod3: nsu = http://test.org/UA/Data/ ;ns=2;i=10762
#ArrayMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10765
#ArrayMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10768
#ArrayMethod3: nsu = http://test.org/UA/Data/ ;ns=2;i=10771
#UserScalarMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10774
#UserScalarMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10777
#UserArrayMethod1: nsu = http://test.org/UA/Data/ ;ns=2;i=10780
#UserArrayMethod2: nsu = http://test.org/UA/Data/ ;ns=2;i=10783

' This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
' For each node, it displays its browse name and node ID.
'
' 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.UA
Imports OpcLabs.EasyOpc.UA.AddressSpace
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace _EasyUAClient
    Friend Class BrowseMethods
        Public Shared Sub Overload2()

            ' Define which server we will work with.
            Dim endpointDescriptor As UAEndpointDescriptor =
                    "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
            ' or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            ' or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            ' Instantiate the client object
            Dim client = New EasyUAClient()

            ' Obtain methods under the specified node.
            Dim nodeElementCollection As UANodeElementCollection
            Try
                nodeElementCollection = client.BrowseMethods(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10755")
            Catch uaException As UAException
                Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}")
                Exit Sub
            End Try

            ' Display results
            For Each nodeElement As UANodeElement In nodeElementCollection
                Console.WriteLine($"{nodeElement.BrowseName}: {nodeElement.NodeId}")
            Next nodeElement
        End Sub

        ' Example output:
        'ScalarMethod1 nsu = http  'test.org/UA/Data/ ;ns=2;i=10756
        'ScalarMethod2: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10759
        'ScalarMethod3: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10762
        'ArrayMethod1: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10765
        'ArrayMethod2: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10768
        'ArrayMethod3: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10771
        'UserScalarMethod1: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10774
        'UserScalarMethod2: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10777
        'UserArrayMethod1: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10780
        'UserArrayMethod2: nsu = http : 'test.org/UA/Data/ ;ns=2;i=10783
    End Class
End Namespace

COM

// This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
// For each node, it displays its browse name and node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// 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.

#include "stdafx.h"    // Includes "QuickOpc.h", and other commonly used files
#include "BrowseMethods.h"

namespace _EasyUAClient
{
    void BrowseMethods::Main()
    {
        // Initialize the COM library
        CoInitializeEx(NULL, COINIT_MULTITHREADED);
        {
            // Instantiate the client object
            _EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient));

            // Perform the operation
            _UANodeElementCollectionPtr NodeElementsPtr = ClientPtr->BrowseMethods(
                //L"http://opcua.demo-this.com:51211/UA/SampleServer", 
                L"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer",
                L"nsu=http://test.org/UA/Data/ ;i=10755");
    
            // Display results
            IEnumVARIANTPtr EnumNodeElementPtr = NodeElementsPtr->GetEnumerator();
            _variant_t vNodeElement;
            while (EnumNodeElementPtr->Next(1, &vNodeElement, NULL) == S_OK)
            {
                _UANodeElementPtr NodeElementPtr(vNodeElement);
                _tprintf(_T("%s: "), (LPCTSTR)CW2CT(NodeElementPtr->BrowseName->ToString));
                _tprintf(_T("%s\n"), (LPCTSTR)CW2CT(NodeElementPtr->NodeId->ToString));
                vNodeElement.Clear();
            }
        }
         // Release all interface pointers BEFORE calling CoUninitialize()
        CoUninitialize();
    }
}

// This example shows how to obtain all method nodes under a given node of
// the OPC-UA address space. For each node, it displays its browse name and
// node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// 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.

class procedure BrowseMethods.Main;
var
  Client: EasyUAClient;
  Count: Cardinal;
  Element: OleVariant;
  NodeElement: _UANodeElement;
  NodeElementEnumerator: IEnumVariant;
  NodeElements: _UANodeElementCollection;
begin
  // Instantiate the client object
  Client := CoEasyUAClient.Create;

  NodeElements := Client.BrowseMethods(
    //'http://opcua.demo-this.com:51211/UA/SampleServer',
    'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer',
    'nsu=http://test.org/UA/Data/ ;i=10755');

  NodeElementEnumerator := NodeElements.GetEnumerator;
  while (NodeElementEnumerator.Next(1, Element, Count) = S_OK) do
  begin
    NodeElement := IUnknown(Element) as _UANodeElement;
    WriteLn(NodeElement.BrowseName.ToString, ': ', NodeElement.NodeId.ToString);
  end;
end;

// This example shows how to obtain all method nodes under a given node of
// the OPC-UA address space. For each node, it displays its browse name and
// node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in Object Pascal (Delphi) on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-OP .
// 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.

class procedure BrowseMethods.Main;
var
  Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient;
  Count: Cardinal;
  Element: OleVariant;
  NodeElement: _UANodeElement;
  NodeElementEnumerator: IEnumVariant;
  NodeElements: _UANodeElementCollection;
begin
  // Instantiate the client object
  Client := CoEasyUAClient.Create;

  try
    NodeElements := Client.BrowseMethods(
      //'http://opcua.demo-this.com:51211/UA/SampleServer',
      //'https://opcua.demo-this.com:51212/UA/SampleServer/',
      'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer',
      'nsu=http://test.org/UA/Data/ ;i=10755');
  except
    on E: EOleException do
    begin
      WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
      Exit;
    end;
  end;

  NodeElementEnumerator := NodeElements.GetEnumerator;
  while (NodeElementEnumerator.Next(1, Element, Count) = S_OK) do
  begin
    NodeElement := IUnknown(Element) as _UANodeElement;
    WriteLn(NodeElement.BrowseName.ToString, ': ', NodeElement.NodeId.ToString);
  end;

  // Example output:
  // ScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10756
  // ScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10759
  // ScalarMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10762
  // ArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10765
  // ArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10768
  // ArrayMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10771
  // UserScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10774
  // UserScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10777
  // UserArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10780
  // UserArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10783

end;

// This example shows how to obtain all method nodes under a given node of the OPC-UA address space. 
// For each node, it displays its browse name and node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in PHP on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PHP .
// 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.

// Instantiate the client object
$Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient");

// Perform the operation
try
{
    $NodeElements = $Client->BrowseMethods(
        //"http://opcua.demo-this.com:51211/UA/SampleServer", 
        "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", 
        "nsu=http://test.org/UA/Data/ ;i=10755");
}
catch (com_exception $e)
{
    printf("*** Failure: %s\n", $e->getMessage());
    Exit();
}


// Display results
foreach ($NodeElements as $NodeElement)
{
    printf("s: s\n", $NodeElement->BrowseName, $NodeElement->NodeId);
}

REM This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
REM For each node, it displays its browse name and node ID.
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 Visual Basic on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VB .
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.

Public Sub BrowseMethods_Main_Command_Click()
    OutputText = ""

    ' Instantiate the client object
    Dim Client As New EasyUAClient

    ' Perform the operation
    On Error Resume Next
    Dim NodeElements As UANodeElementCollection
    Set NodeElements = Client.BrowseMethods("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10755")
    If Err.Number <> 0 Then
        OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf
        Exit Sub
    End If
    On Error GoTo 0

    ' Display results
    Dim NodeElement: For Each NodeElement In NodeElements
        OutputText = OutputText & NodeElement.BrowseName & ": " & NodeElement.NodeId & vbCrLf
    Next
End Sub

Rem This example shows how to obtain all method nodes under a given node of the OPC-UA address space. 
Rem For each node, it displays its browse name and node ID.
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

' Instantiate the client object
Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.UA.EasyUAClient")

' Perform the operation
On Error Resume Next
Dim NodeElements: Set NodeElements = Client.BrowseMethods("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10755")
If Err.Number <> 0 Then
    WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description
    WScript.Quit
End If
On Error Goto 0

' Display results
Dim NodeElement: For Each NodeElement In NodeElements
    WScript.Echo NodeElement.BrowseName & ": " & NodeElement.NodeId
Next


' Example output:
'ScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10756
'ScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10759
'ScalarMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10762
'ArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10765
'ArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10768
'ArrayMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10771
'UserScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10774
'UserScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10777
'UserArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10780
'UserArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10783

Python

Python (.NET)

# This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
# For each node, it displays its browse name and node ID.
#
# 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.UA import *
from OpcLabs.EasyOpc.UA.AddressSpace import *
from OpcLabs.EasyOpc.UA.OperationModel import *


endpointDescriptor = UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer')
# or 'http://opcua.demo-this.com:51211/UA/SampleServer' (currently not supported)
# or 'https://opcua.demo-this.com:51212/UA/SampleServer/'

# Instantiate the client object.
client = EasyUAClient()

# Obtain methods under the specified node.
try:
    nodeElementCollection = IEasyUAClientExtension.BrowseMethods(client,
                                                                 endpointDescriptor,
                                                                 UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10755'))
except UAException as uaException:
    print('*** Failure: ' + uaException.GetBaseException().Message)
    exit()

# Display results.
for nodeElement in nodeElementCollection:
    print(nodeElement.BrowseName, ': ', nodeElement.NodeId, sep='')

Concepts

Browsing for OPC UA Nodes

Calling Methods in OPC-UA