Examples - OPC Unified Architecture - Parse an absolute browse path

.NET

C#
VB.NET

// Parses an absolute OPC-UA browse path and displays its starting node and elements.
//
// 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.Navigation;
using OpcLabs.EasyOpc.UA.Navigation.Parsing;

namespace UACommonDocExamples._UABrowsePathParser
{
    class Parse
    {
        public static void Main1()
        {
            var browsePathParser = new UABrowsePathParser();
            UABrowsePath browsePath;
            try
            {
                browsePath = browsePathParser.Parse("[ObjectsFolder]/Data/Static/UserScalar");
            }
            catch (UABrowsePathFormatException browsePathFormatException)
            {
                Console.WriteLine("*** Failure: {0}", browsePathFormatException.GetBaseException().Message);
                return;
            }

            // Display results
            Console.WriteLine("StartingNodeId: {0}", browsePath.StartingNodeId);

            foreach (UABrowsePathElement browsePathElement in browsePath.Elements)
                Console.WriteLine(browsePathElement);

            // Example output:
            // StartingNodeId: ObjectsFolder
            // /Data
            // /Static
            // /UserScalar
        }
    }
}

' Parses an absolute  OPC-UA browse path and displays its starting node and elements.
'
' 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.Navigation
Imports OpcLabs.EasyOpc.UA.Navigation.Parsing

Namespace _UABrowsePathParser
    Friend Class Parse
        Public Shared Sub Main1()
            Dim browsePathParser = New UABrowsePathParser()
            Dim browsePath As UABrowsePath
            Try
                browsePath = browsePathParser.Parse("[ObjectsFolder]/Data/Static/UserScalar")
            Catch browsePathFormatException As UABrowsePathFormatException
                Console.WriteLine("*** Failure: {0}", browsePathFormatException.GetBaseException.Message)
                Exit Sub
            End Try

            ' Display results
            Console.WriteLine("StartingNodeId: {0}", browsePath.StartingNodeId)

            For Each browsePathElement As UABrowsePathElement In browsePath.Elements
                Console.WriteLine(browsePathElement)
            Next browsePathElement

            ' Example output:
            ' StartingNodeId: ObjectsFolder
            ' /Data
            ' /Static
            ' /UserScalar
        End Sub
    End Class
End Namespace

COM

// Parses an absolute  OPC-UA browse path and displays its starting node and elements.
//
// 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 Parse.Main;
var
  BrowsePath: _UABrowsePath;
  BrowsePathElement: _UABrowsePathElement;
  BrowsePathParser: OpcLabs_EasyOpcUA_TLB._UABrowsePathParser;
  Count: Cardinal;
  Element: OleVariant;
  ElementEnumerator: IEnumVariant;
begin
  BrowsePathParser := CoUABrowsePathParser.Create;

  try
    BrowsePath := BrowsePathParser.Parse('[ObjectsFolder]/Data/Static/UserScalar');
  except
    on E: EOleException do
    begin
      WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
      Exit;
    end;
  end;

  // Display results
  WriteLn('StartingNodeId: ', BrowsePath.StartingNodeId.ToString);

  WriteLn('Elements:');
  ElementEnumerator := BrowsePath.Elements.GetEnumerator;
  while (ElementEnumerator.Next(1, Element, Count) = S_OK) do
  begin
    BrowsePathElement := IUnknown(Element) as _UABrowsePathElement;
    WriteLn(BrowsePathElement.ToString);
  end;

  // Example output:
  // StartingNodeId: ObjectsFolder
  // Elements:
  // /Data
  // /Static
  // /UserScalar

end;

// Parses an absolute  OPC-UA browse path and displays its starting node and elements.
//
// 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.


$BrowsePathParser = new COM("OpcLabs.EasyOpc.UA.Navigation.Parsing.UABrowsePathParser");

try
{
    $BrowsePath = $BrowsePathParser->Parse("[ObjectsFolder]/Data/Static/UserScalar");
}
catch (com_exception $e)
{
    printf("*** Failure: %s\n", $e->getMessage());
    exit();
}

// Display results
printf("StartingNodeId: %s\n", $BrowsePath->StartingNodeId);

printf("Elements:\n");

for ($i = 0; $i < $BrowsePath->Elements->Count; $i++)
{
    printf("%s\n", $BrowsePath->Elements[$i]);
}

// Example output:
// StartingNodeId: ObjectsFolder
// Elements:
// /Data
// /Static
// /UserScalar

REM Parses an absolute  OPC-UA browse path and displays its starting node and elements.
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.

Private Sub Parse_Main_Command_Click()
    OutputText = ""
    
    Dim BrowsePathParser As New UABrowsePathParser

    On Error Resume Next
    Dim browsePath As UABrowsePath
    Set browsePath = BrowsePathParser.Parse("[ObjectsFolder]/Data/Static/UserScalar")
    If Err.Number <> 0 Then
        OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf
        Exit Sub
    End If
    On Error GoTo 0
    
    ' Display results
    OutputText = OutputText & "StartingNodeId: " & browsePath.StartingNodeId & vbCrLf
    
    OutputText = OutputText & "Elements:" & vbCrLf
    Dim BrowsePathElement: For Each BrowsePathElement In browsePath.Elements
        OutputText = OutputText & BrowsePathElement & vbCrLf
    Next

    ' Example output:
    'StartingNodeId: ObjectsFolder
    'Elements:
    '/Data
    '/Static
    '/UserScalar
End Sub

Rem Parses an absolute  OPC-UA browse path and displays its starting node and elements.
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 BrowsePathParser: Set BrowsePathParser = CreateObject("OpcLabs.EasyOpc.UA.Navigation.Parsing.UABrowsePathParser")
On Error Resume Next
Dim BrowsePath: Set BrowsePath = BrowsePathParser.Parse("[ObjectsFolder]/Data/Static/UserScalar")
If Err.Number <> 0 Then
    WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description
    WScript.Quit
End If
On Error Goto 0

' Display results
WScript.Echo "StartingNodeId: " & BrowsePath.StartingNodeId

WScript.Echo "Elements:"
Dim BrowsePathElement: For Each BrowsePathElement In BrowsePath.Elements
    WScript.Echo BrowsePathElement
Next

Python

Python (.NET)

# Parses an absolute  OPC-UA browse path and displays its starting node and elements.
#
# 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.Navigation import *
from OpcLabs.EasyOpc.UA.Navigation.Parsing import *


browsePathParser = UABrowsePathParser()
try:
    browsePath = browsePathParser.Parse('[ObjectsFolder]/Data/Static/UserScalar')
except UABrowsePathFormatException as browsePathFormatException:
    print('*** Failure: ' + browsePathFormatException.GetBaseException().Message)
    exit()

# Display results.
print('StartingNodeId: ', browsePath.StartingNodeId, sep='')

print()
for browsePathElement in browsePath.Elements:
    print(browsePathElement)

print()
print('Finished.')

Fundamentals

OPC-UA Browse Path Format

Examples - Client OPC Data Access

Examples - OPC Data Access - Read a single item using browse path