Examples - OPC Unified Architecture - Read DataType attributes

.NET

// This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also possible 
// to read multiple attributes of the same 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.BaseLib.OperationModel;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.AddressSpace;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples._EasyUAClient
{
    partial class ReadMultipleValues
    {
        public static void DataType()
        {
            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 values.
            ValueResult[] valueResultArray = client.ReadMultipleValues(new[]
                {
                    new UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", UAAttributeId.DataType),
                    new UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", UAAttributeId.DataType),
                    new UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", UAAttributeId.DataType)
                });

            // Display results.
            foreach (ValueResult valueResult in valueResultArray)
            {
                Console.WriteLine();

                if (valueResult.Succeeded)
                {
                    Console.WriteLine($"Value: {valueResult.Value}");
                    var dataTypeId = valueResult.Value as UANodeId;
                    if (!(dataTypeId is null))
                    {
                        Console.WriteLine($"Value.ExpandedText: {dataTypeId.ExpandedText}");
                        Console.WriteLine($"Value.NamespaceUriString: {dataTypeId.NamespaceUriString}");
                        Console.WriteLine($"Value.NamespaceIndex: {dataTypeId.NamespaceIndex}");
                        Console.WriteLine($"Value.NumericIdentifier: {dataTypeId.NumericIdentifier}");
                    }
                }
                else
                    Console.WriteLine($"*** Failure: {valueResult.ErrorMessageBrief}");
            }

            // Example output:
            //
            //Value: SByte
            //Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=2
            //Value.NamespaceUriString: http://opcfoundation.org/UA/
            //Value.NamespaceIndex: 0
            //Value.NumericIdentifier: 2
            //
            //Value: Float
            //Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=10
            //Value.NamespaceUriString: http://opcfoundation.org/UA/
            //Value.NamespaceIndex: 0
            //Value.NumericIdentifier: 10
            //
            //Value: String
            //Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=12
            //Value.NamespaceUriString: http://opcfoundation.org/UA/
            //Value.NamespaceIndex: 0
            //Value.NumericIdentifier: 12
        }
    }
}

# This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also possible 
# to read multiple attributes of the same node.
#
# 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.AddressSpace
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 values. 
$valueResultArray = $client.ReadMultipleValues([UAReadArguments[]]@(
        (New-Object UAReadArguments($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", [UAAttributeId]::DataType)), 
        (New-Object UAReadArguments($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", [UAAttributeId]::DataType)), 
        (New-Object UAReadArguments($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", [UAAttributeId]::DataType))
    ))

foreach ($valueResult in $valueResultArray) {
    Write-Host

    if ($valueResult.Succeeded) {
        Write-Host "Value: $($valueResult.Value)"
        [UANodeId]$dataTypeId = $valueResult.Value;
        if ($dataTypeId -ne $null) {
            Write-Host "Value.ExpandedText: $($dataTypeId.ExpandedText)"
            Write-Host "Value.NamespaceUriString: $($dataTypeId.NamespaceUriString)"
            Write-Host "Value.NamespaceIndex: $($dataTypeId.NamespaceIndex)"
            Write-Host "Value.NumericIdentifier: $($dataTypeId.NumericIdentifier)"
        }
    }
    else {
        Write-Host "*** Failure: $($valueResult.ErrorMessageBrief)"
    }
}


# Example output:
#
#Value: SByte
#Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=2
#Value.NamespaceUriString: http://opcfoundation.org/UA/
#Value.NamespaceIndex: 0
#Value.NumericIdentifier: 2
#
#Value: Float
#Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=10
#Value.NamespaceUriString: http://opcfoundation.org/UA/
#Value.NamespaceIndex: 0
#Value.NumericIdentifier: 10
#
#Value: String
#Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=12
#Value.NamespaceUriString: http://opcfoundation.org/UA/
#Value.NamespaceIndex: 0
#Value.NumericIdentifier: 12

' This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also possible 
' to read multiple attributes of the same 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 System
Imports OpcLabs.BaseLib.OperationModel
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.AddressSpace
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace _EasyUAClient
    Partial Friend Class ReadMultipleValues
        Public Shared Sub DataType()

            ' 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 values.
            Dim valueResultArray() As ValueResult = client.ReadMultipleValues(New UAReadArguments() _
               {
                   New UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10845", UAAttributeId.DataType),
                   New UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853", UAAttributeId.DataType),
                   New UAReadArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10855", UAAttributeId.DataType)
               }
            )

            ' Display results
            For Each valueResult As ValueResult In valueResultArray
                Console.WriteLine()

                If valueResult.Succeeded Then
                    Console.WriteLine("Value: {0}", valueResult.Value)
                    Dim dataTypeId = CType(valueResult.Value, UANodeId)
                    If Not dataTypeId Is Nothing Then
                        Console.WriteLine("Value.ExpandedText: {0}", dataTypeId.ExpandedText)
                        Console.WriteLine("Value.NamespaceUriString: {0}", dataTypeId.NamespaceUriString)
                        Console.WriteLine("Value.NamespaceIndex: {0}", dataTypeId.NamespaceIndex)
                        Console.WriteLine("Value.NumericIdentifier: {0}", dataTypeId.NumericIdentifier)
                    End If
                Else
                    Console.WriteLine("*** Failure: {0}", valueResult.ErrorMessageBrief)
                End If
            Next valueResult

            ' Example output:
            '
            'Value: SByte
            'Value.ExpandedText: nsu = http : //opcfoundation.org/UA/ ;i=2
            'Value.NamespaceUriString: http : //opcfoundation.org/UA/
            'Value.NamespaceIndex: 0
            'Value.NumericIdentifier: 2
            '
            'Value: Float
            'Value.ExpandedText: nsu = http : //opcfoundation.org/UA/ ;i=10
            'Value.NamespaceUriString: http : //opcfoundation.org/UA/
            'Value.NamespaceIndex: 0
            'Value.NumericIdentifier: 10
            '
            'Value: String
            'Value.ExpandedText: nsu = http : //opcfoundation.org/UA/ ;i=12
            'Value.NamespaceUriString: http : //opcfoundation.org/UA/
            'Value.NamespaceIndex: 0
            'Value.NumericIdentifier: 12
        End Sub
    End Class
End Namespace

COM

// This example shows how to read the DataType attributes of 3 different nodes at
// once. Using the same method, it is also possible to read multiple attributes
// of the same node.
//
// 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 ReadMultipleValues.DataType;
var
  Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient;
  ReadArguments1, ReadArguments2, ReadArguments3: _UAReadArguments;
  Arguments, Results: OleVariant;
  I: Cardinal;
  Result: _ValueResult;
begin
  // Instantiate the client object
  Client := CoEasyUAClient.Create;

  ReadArguments1 := CoUAReadArguments.Create;
  ReadArguments1.EndpointDescriptor.UrlString := 
    //'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';
  ReadArguments1.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/ ;i=10845';
  ReadArguments1.AttributeId := UAAttributeId_DataType;

  ReadArguments2 := CoUAReadArguments.Create;
  ReadArguments2.EndpointDescriptor.UrlString := 
    //'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';
  ReadArguments2.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/ ;i=10853';
  ReadArguments2.AttributeId := UAAttributeId_DataType;

  ReadArguments3 := CoUAReadArguments.Create;
  ReadArguments3.EndpointDescriptor.UrlString := 
    //'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';
  ReadArguments3.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/ ;i=10855';
  ReadArguments3.AttributeId := UAAttributeId_DataType;

  Arguments := VarArrayCreate([0, 2], varVariant);
  Arguments[0] := ReadArguments1;
  Arguments[1] := ReadArguments2;
  Arguments[2] := ReadArguments3;

  // Obtain values. By default, the Value attributes of the nodes will be read.
  TVarData(Results).VType := varArray or varVariant;
  TVarData(Results).VArray := PVarArray(Client.ReadMultipleValues(Arguments));

  // Display results
  for I := VarArrayLowBound(Results, 1) to VarArrayHighBound(Results, 1) do
  begin
      Result := IInterface(Results[I]) as _ValueResult;
      WriteLn;
      if Result.Succeeded then
      begin
          WriteLn('Value: ', Result.Value);
          WriteLn('Value.ExpandedText: ', Result.Value.ExpandedText);
          WriteLn('Value.NamespaceUriString: ', Result.Value.NamespaceUriString);
          WriteLn('Value.NamespaceIndex: ', Result.Value.NamespaceIndex);
          WriteLn('Value.NumericIdentifier: ', Result.Value.NumericIdentifier);
      end
      else
        WriteLn('results(', I, ') *** Failure: ', Result.ErrorMessageBrief);
  end;
  
  VarClear(Results);
  VarClear(Arguments);

  // Example output:
  //
  //
  //Value: SByte
  //Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=2
  //Value.NamespaceUriString: http://opcfoundation.org/UA/
  //Value.NamespaceIndex: 0
  //Value.NumericIdentifier: 2
  //
  //Value: Float
  //Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=10
  //Value.NamespaceUriString: http://opcfoundation.org/UA/
  //Value.NamespaceIndex: 0
  //Value.NumericIdentifier: 10
  //
  //Value: String
  //Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=12
  //Value.NamespaceUriString: http://opcfoundation.org/UA/
  //Value.NamespaceIndex: 0
  //Value.NumericIdentifier: 12
end;

// This example shows how to read the DataType attributes of 3 different nodes at
// once. Using the same method, it is also possible to read multiple attributes
// of the same node.
//
// 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.

const UAAttributeId_DataType = 14;

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

$ReadArguments1 = new COM("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments");
$ReadArguments1->EndpointDescriptor->UrlString = 
    //"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";
$ReadArguments1->NodeDescriptor->NodeId->ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10845";
$ReadArguments1->AttributeId = UAAttributeId_DataType;

$ReadArguments2 = new COM("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments");
$ReadArguments2->EndpointDescriptor->UrlString = 
    //"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";
$ReadArguments2->NodeDescriptor->NodeId->ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10853";
$ReadArguments2->AttributeId = UAAttributeId_DataType;

$ReadArguments3 = new COM("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments");
$ReadArguments3->EndpointDescriptor->UrlString = 
    //"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";
$ReadArguments3->NodeDescriptor->NodeId->ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10855";
$ReadArguments3->AttributeId = UAAttributeId_DataType;

$arguments[0] = $ReadArguments1;
$arguments[1] = $ReadArguments2;
$arguments[2] = $ReadArguments3;

// Obtain values. By default, the Value attributes of the nodes will be read.
$results = $Client->ReadMultipleValues($arguments);

// Display results
for ($i = 0; $i < count($results); $i++)
{
    $ValueResult = $results[$i];
    printf("\n");
    if ($ValueResult->Succeeded)
    {
        printf("Value: %s\n", $ValueResult->Value);
        printf("Value.ExpandedText: %s\n", $ValueResult->Value->ExpandedText);
        printf("Value.NamespaceUriString: %s\n", $ValueResult->Value->NamespaceUriString);
        printf("Value.NamespaceIndex: %s\n", $ValueResult->Value->NamespaceIndex);
        printf("Value.NumericIdentifier: %s\n", $ValueResult->Value->NumericIdentifier);
    }
    else
        printf("*** Failure: %s\n", $ValueResult->ErrorMessageBrief);
}

// Example output:
//
//
//Value: SByte
//Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=2
//Value.NamespaceUriString: http://opcfoundation.org/UA/
//Value.NamespaceIndex: 0
//Value.NumericIdentifier: 2
//
//Value: Float
//Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=10
//Value.NamespaceUriString: http://opcfoundation.org/UA/
//Value.NamespaceIndex: 0
//Value.NumericIdentifier: 10
//
//Value: String
//Value.ExpandedText: nsu=http://opcfoundation.org/UA/;i=12
//Value.NamespaceUriString: http://opcfoundation.org/UA/
//Value.NamespaceIndex: 0
//Value.NumericIdentifier: 12

REM This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also possible
REM to read multiple attributes of the same 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 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 ReadMultipleValues_DataType_Command_Click()
    OutputText = ""
    
    ' Instantiate the client object
    Dim Client As New EasyUAClient

    Dim readArguments1 As New UAReadArguments
    readArguments1.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
    readArguments1.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10845"
    readArguments1.AttributeId = UAAttributeId_DataType

    Dim ReadArguments2 As New UAReadArguments
    ReadArguments2.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
    ReadArguments2.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10853"
    ReadArguments2.AttributeId = UAAttributeId_DataType

    Dim ReadArguments3 As New UAReadArguments
    ReadArguments3.endpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
    ReadArguments3.nodeDescriptor.NodeId.expandedText = "nsu=http://test.org/UA/Data/ ;i=10855"
    ReadArguments3.AttributeId = UAAttributeId_DataType

    Dim arguments(2) As Variant
    Set arguments(0) = readArguments1
    Set arguments(1) = ReadArguments2
    Set arguments(2) = ReadArguments3

    ' Obtain values.
    Dim results() As Variant
    results = Client.ReadMultipleValues(arguments)

    ' Display results
    Dim i: For i = LBound(results) To UBound(results)
        OutputText = OutputText & vbCrLf
        
        Dim Result As valueResult: Set Result = results(i)
        If Result.Succeeded Then
            OutputText = OutputText & "Value: " & Result.value & vbCrLf
            On Error Resume Next
            OutputText = OutputText & "Value.ExpandedText: " & Result.value.expandedText & vbCrLf
            OutputText = OutputText & "Value.NamespaceUriString: " & Result.value.NamespaceUriString & vbCrLf
            OutputText = OutputText & "Value.NamespaceIndex: " & Result.value.NamespaceIndex & vbCrLf
            OutputText = OutputText & "Value.NumericIdentifier: " & Result.value.NumericIdentifier & vbCrLf
            On Error GoTo 0
        Else
            OutputText = OutputText & "*** Failure: " & Result.ErrorMessageBrief & vbCrLf
        End If
    Next

    ' Example output:
    '
    'Value: SByte
    'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=2
    'Value.NamespaceUriString: http://opcfoundation.org/UA/
    'Value.NamespaceIndex: 0
    'Value.NumericIdentifier: 2
    '
    'Value: Float
    'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=10
    'Value.NamespaceUriString: http://opcfoundation.org/UA/
    'Value.NamespaceIndex: 0
    'Value.NumericIdentifier: 10
    '
    'Value: String
    'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=12
    'Value.NamespaceUriString: http://opcfoundation.org/UA/
    'Value.NamespaceIndex: 0
    'Value.NumericIdentifier: 12
End Sub

Rem This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also possible 
Rem to read multiple attributes of the same 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

Const UAAttributeId_DataType = 14

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

Dim ReadArguments1: Set ReadArguments1 = CreateObject("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments")
ReadArguments1.EndpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
ReadArguments1.NodeDescriptor.NodeId.ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10845"
ReadArguments1.AttributeId = UAAttributeId_DataType

Dim ReadArguments2: Set ReadArguments2 = CreateObject("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments")
ReadArguments2.EndpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
ReadArguments2.NodeDescriptor.NodeId.ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10853"
ReadArguments2.AttributeId = UAAttributeId_DataType

Dim ReadArguments3: Set ReadArguments3 = CreateObject("OpcLabs.EasyOpc.UA.OperationModel.UAReadArguments")
ReadArguments3.EndpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
ReadArguments3.NodeDescriptor.NodeId.ExpandedText = "nsu=http://test.org/UA/Data/ ;i=10855"
ReadArguments3.AttributeId = UAAttributeId_DataType

Dim arguments(2)
Set arguments(0) = ReadArguments1
Set arguments(1) = ReadArguments2
Set arguments(2) = ReadArguments3

' Obtain values.
Dim results: results = Client.ReadMultipleValues(arguments)

' Display results
Dim i: For i = LBound(results) To UBound(results)
    WScript.Echo

    Dim ValueResult: Set ValueResult = results(i)
    If ValueResult.Succeeded Then
        WScript.Echo "Value: " & ValueResult.Value
        On Error Resume Next
        WScript.Echo "Value.ExpandedText: " & ValueResult.Value.ExpandedText
        WScript.Echo "Value.NamespaceUriString: " & ValueResult.Value.NamespaceUriString
        WScript.Echo "Value.NamespaceIndex: " & ValueResult.Value.NamespaceIndex
        WScript.Echo "Value.NumericIdentifier: " & ValueResult.Value.NumericIdentifier
        On Error Goto 0
    Else
        WScript.Echo "*** Failure: " & ValueResult.ErrorMessageBrief
    End If
Next

' Example output:
'
'Value: SByte
'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=2
'Value.NamespaceUriString: http://opcfoundation.org/UA/
'Value.NamespaceIndex: 0
'Value.NumericIdentifier: 2
'
'Value: Float
'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=10
'Value.NamespaceUriString: http://opcfoundation.org/UA/
'Value.NamespaceIndex: 0
'Value.NumericIdentifier: 10
'
'Value: String
'Value.ExpandedText: nsu=http://opcfoundation.org/UA/ ;i=12
'Value.NamespaceUriString: http://opcfoundation.org/UA/
'Value.NamespaceIndex: 0
'Value.NumericIdentifier: 12

Python

Python (.NET)

# This example shows how to read the DataType attributes of 3 different nodes at once. Using the same method, it is also
# possible to read multiple attributes of the same 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 time

# 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 values. By default, the Value attributes of the nodes will be read.
valueResultArray = IEasyUAClientExtension.ReadMultipleValues(client, [
    UAReadArguments(endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10845'),
                    UAAttributeId.DataType),
    UAReadArguments(endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853'),
                    UAAttributeId.DataType),
    UAReadArguments(endpointDescriptor, UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10855'),
                    UAAttributeId.DataType),
    ])

# Display results.
for valueResult in valueResultArray:
    print()
    #
    if valueResult.Succeeded:
        print('Value: ', valueResult.Value, sep='')
        if isinstance(valueResult.Value, UANodeId):
            dataTypeId = valueResult.Value
            print('dataTypeId.ExpandedText: ', dataTypeId.ExpandedText, sep='')
            print('dataTypeId.NamespaceUriString: ', dataTypeId.NamespaceUriString, sep='')
            print('dataTypeId.NamespaceIndex: ', dataTypeId.NamespaceIndex, sep='')
            print('dataTypeId.NumericIdentifier: ', dataTypeId.NumericIdentifier, sep='')
    else:
        print('*** Failure: ', valueResult.ErrorMessageBrief, sep='')

print()
print('Finished.')

Concepts

Reading just the value (OPC UA)

Reading Attributes of OPC UA Nodes