Examples - OPC Unified Architecture - Try to parse a relative browse path

.NET

C#
VB.NET

// Attempts to parse a relative OPC-UA browse path and displays its 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.BaseLib;
using OpcLabs.EasyOpc.UA.Navigation;
using OpcLabs.EasyOpc.UA.Navigation.Parsing;

namespace UACommonDocExamples._UABrowsePathParser
{
    class TryParseRelative
    {
        public static void Main1()
        {
            var browsePathElements = new UABrowsePathElementCollection();

            var browsePathParser = new UABrowsePathParser();
            IStringParsingError stringParsingError = browsePathParser.TryParseRelative("/Data.Dynamic.Scalar.CycleComplete", browsePathElements);

            // Display results
            if (!(stringParsingError is null))
            {
                Console.WriteLine("*** Error: {0}", stringParsingError);
                return;
            }

            foreach (UABrowsePathElement browsePathElement in browsePathElements)
                Console.WriteLine(browsePathElement);

            // Example output:
            // /Data
            // .Dynamic
            // .Scalar
            // .CycleComplete        
        }
    }
}

' Attempts to parse a relative OPC-UA browse path and displays its 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 System
Imports OpcLabs.BaseLib
Imports OpcLabs.EasyOpc.UA.Navigation
Imports OpcLabs.EasyOpc.UA.Navigation.Parsing

Namespace _UABrowsePathParser
    Friend Class TryParseRelative
        Public Shared Sub Main1()
            Dim browsePathElements = New UABrowsePathElementCollection()

            Dim browsePathParser = New UABrowsePathParser()
            Dim stringParsingError As IStringParsingError = browsePathParser.TryParseRelative("/Data.Dynamic.Scalar.CycleComplete", browsePathElements)

            ' Display results
            If Not stringParsingError Is Nothing Then
                Console.WriteLine("*** Error: {0}", stringParsingError)
                Exit Sub
            End If

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

            ' Example output:
            ' /Data
            ' .Dynamic
            ' .Scalar
            ' .CycleComplete
        End Sub
    End Class
End Namespace

COM

// Attempts to parse a relative OPC-UA browse path and displays its 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 TryParseRelative.Main;
var
  BrowsePathElement: _UABrowsePathElement;
  BrowsePathElements: _UABrowsePathElementCollection;
  BrowsePathParser: OpcLabs_EasyOpcUA_TLB._UABrowsePathParser;
  Count: Cardinal;
  Element: OleVariant;
  ElementEnumerator: IEnumVariant;
  StringParsingError: _StringParsingError;
begin
  BrowsePathElements := CoUABrowsePathElementCollection.Create;

  BrowsePathParser := CoUABrowsePathParser.Create;
  StringParsingError := BrowsePathParser.TryParseRelative('/Data.Dynamic.Scalar.CycleComplete', BrowsePathElements);

  // Display results
  if StringParsingError <> nil then
  begin
    WriteLn('*** Error: ', StringParsingError.ToString);
    Exit;
  end;

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

  // Example output:
  // /Data
  // .Dynamic
  // .Scalar
  // .CycleComplete

end;

// Attempts to parse a relative OPC-UA browse path and displays its 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.

$BrowsePathElements = new COM("OpcLabs.EasyOpc.UA.Navigation.UABrowsePathElementCollection");

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

$StringParsingError = $BrowsePathParser->TryParseRelative("/Data.Dynamic.Scalar.CycleComplete", $BrowsePathElements);

// Display results
if (!is_null($StringParsingError)) {
    printf("*** Error: %s\n", $StringParsingError);
    exit();
}

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

printf("Elements:\n");

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

// Example output:
// /Data
// .Dynamic
// .Scalar
// .CycleComplete

REM Attempts to parse a relative OPC-UA browse path and displays its 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 TryParseRelative_Main_Command_Click()
    OutputText = ""
    
    Dim BrowsePathElements As New UABrowsePathElementCollection
    
    Dim BrowsePathParser As New UABrowsePathParser

    Dim stringParsingError As stringParsingError
    Set stringParsingError = BrowsePathParser.TryParseRelative("/Data.Dynamic.Scalar.CycleComplete", BrowsePathElements)
    
    ' Display results
    If Not stringParsingError Is Nothing Then
        OutputText = OutputText & "*** Error: " & stringParsingError & vbCrLf
        Exit Sub
    End If
    
    Dim BrowsePathElement: For Each BrowsePathElement In BrowsePathElements
        OutputText = OutputText & BrowsePathElement & vbCrLf
    Next

    ' Example output:
    '/Data
    '.Dynamic
    '.Scalar
    '.CycleComplete
End Sub

Rem Attempts to parse a relative OPC-UA browse path and displays its 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 BrowsePathElements: Set BrowsePathElements = CreateObject("OpcLabs.EasyOpc.UA.Navigation.UABrowsePathElementCollection")

Dim BrowsePathParser: Set BrowsePathParser = CreateObject("OpcLabs.EasyOpc.UA.Navigation.Parsing.UABrowsePathParser")
Dim StringParsingError: Set StringParsingError = BrowsePathParser.TryParseRelative("/Data.Dynamic.Scalar.CycleComplete", BrowsePathElements)

' Display results
If Not (StringParsingError Is Nothing) Then
    WScript.Echo "*** Error: " & StringParsingError
    WScript.Quit
End If

Dim BrowsePathElement: For Each BrowsePathElement In BrowsePathElements
    WScript.Echo BrowsePathElement
Next

Python

Python (.NET)

# Attempts to parse a relative OPC-UA browse path and displays its 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 *


browsePathElements = UABrowsePathElementCollection()

browsePathParser = UABrowsePathParser()
stringParsingError = browsePathParser.TryParseRelative('/Data.Dynamic.Scalar.CycleComplete', browsePathElements)

# Display results.
if stringParsingError is not None:
    print('*** Error: ', stringParsingError, sep='')
    exit()

for browsePathElement in browsePathElements:
    print(browsePathElement)

print()
print('Finished.')

Fundamentals

OPC-UA Browse Path Format