Examples - OPC Data Access - Read multiple item values

.NET

// This example shows how to read values of 4 items at once, and display them.

using System;
using System.Diagnostics;
using OpcLabs.BaseLib.OperationModel;
using OpcLabs.EasyOpc.DataAccess;

namespace DocExamples.DataAccess._EasyDAClient
{
    class ReadMultipleItemValues
    {
        public static void Main1()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();

            ValueResult[] valueResults = client.ReadMultipleItemValues("OPCLabs.KitServer.2",
                new DAItemDescriptor[]
                {
                    "Simulation.Random", "Trends.Ramp (1 min)", "Trends.Sine (1 min)", "Simulation.Register_I4"
                });

            for (int i = 0; i < valueResults.Length; i++)
            {
                ValueResult valueResult = valueResults[i];
                Debug.Assert(!(valueResult is null));

                if (valueResult.Succeeded)
                    Console.WriteLine($"valueResults({i}).Value: {valueResult.Value}");
                else
                    Console.WriteLine($"valueResults({i}) *** Failure: {valueResult.ErrorMessageBrief}");
            }
        }


        // Example output:
        //
        //valueResults(0).Value: 0.00125125888851588
        //valueResults(1).Value: 0.732510924339294
        //valueResults(2).Value: -0.993968485238202
        //valueResults(3).Value: 0
    }
}

# This example shows how to read values of 4 items at once, and display them.

# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from OpcLabs.EasyOpc import *
from OpcLabs.EasyOpc.DataAccess import *
from OpcLabs.EasyOpc.DataAccess.OperationModel import *
from OpcLabs.EasyOpc.OperationModel import *


# Instantiate the client object.
client = EasyDAClient()

#
valueResultArray = IEasyDAClientExtension.ReadMultipleItemValues(client, [
    DAReadItemArguments(ServerDescriptor('OPCLabs.KitServer.2'), DAItemDescriptor('Simulation.Random')),
    DAReadItemArguments(ServerDescriptor('OPCLabs.KitServer.2'), DAItemDescriptor('Trends.Ramp (1 min)')),
    DAReadItemArguments(ServerDescriptor('OPCLabs.KitServer.2'), DAItemDescriptor('Trends.Sine (1 min)')),
    DAReadItemArguments(ServerDescriptor('OPCLabs.KitServer.2'), DAItemDescriptor('Simulation.Register_I4')),
    ])

for i, valueResult in enumerate(valueResultArray):
    assert valueResult is not None
    if valueResult.Succeeded:
        print('valueResultArray[', i, '].Value: ', valueResult.Value, sep='')
    else:
        print('valueResultArray[', i, '] *** Failure: ', valueResult.ErrorMessageBrief, sep='')

# This example shows how to read values of 4 items at once, and display them.

#requires -Version 5.1
using namespace OpcLabs.EasyOpc.DataAccess

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

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

$valueResults = [IEasyDAClientExtension]::ReadMultipleItemValues($client, 
    "OPCLabs.KitServer.2", @(
        (New-Object DAItemDescriptor("Simulation.Random")),
        (New-Object DAItemDescriptor("Trends.Ramp (1 min)")),
        (New-Object DAItemDescriptor("Trends.Sine (1 min)")),
        (New-Object DAItemDescriptor("Simulation.Register_I4"))
        ))

for ($i = 0; $i -lt $valueResults.Length; $i++) {
    $valueResult = $valueResults[$i]
    if ($valueResult.Succeeded) {
        Write-Host "valueResults($($i)).Value: $($valueResult.Value)"
    }
    else {
        Write-Host "valueResults($($i)) *** Failure: $($valueResult.ErrorMessageBrief)"
    }
}


# Example output:
#
#valueResults(0).Value: 0.00125125888851588
#valueResults(1).Value: 0.732510924339294
#valueResults(2).Value: -0.993968485238202
#valueResults(3).Value: 0

COM

// This example shows how to read values of 4 items at once, and display them.

class procedure ReadMultipleItemValues.Main;
var
  Arguments: OleVariant;
  Client: OpcLabs_EasyOpcClassic_TLB._EasyDAClient;
  I: Cardinal;
  ReadItemArguments1: _DAReadItemArguments;
  ReadItemArguments2: _DAReadItemArguments;
  ReadItemArguments3: _DAReadItemArguments;
  ReadItemArguments4: _DAReadItemArguments;
  ValueResult: _ValueResult;
  Results: OleVariant;
begin
  ReadItemArguments1 := CoDAReadItemArguments.Create;
  ReadItemArguments1.ServerDescriptor.ServerClass := 'OPCLabs.KitServer.2';
  ReadItemArguments1.ItemDescriptor.ItemID := 'Simulation.Random';

  ReadItemArguments2 := CoDAReadItemArguments.Create;
  ReadItemArguments2.ServerDescriptor.ServerClass := 'OPCLabs.KitServer.2';
  ReadItemArguments2.ItemDescriptor.ItemID := 'Trends.Ramp (1 min)';

  ReadItemArguments3 := CoDAReadItemArguments.Create;
  ReadItemArguments3.ServerDescriptor.ServerClass := 'OPCLabs.KitServer.2';
  ReadItemArguments3.ItemDescriptor.ItemID := 'Trends.Sine (1 min)';

  ReadItemArguments4 := CoDAReadItemArguments.Create;
  ReadItemArguments4.ServerDescriptor.ServerClass := 'OPCLabs.KitServer.2';
  ReadItemArguments4.ItemDescriptor.ItemID := 'Simulation.Register_I4';

  Arguments := VarArrayCreate([0, 3], varVariant);
  Arguments[0] := ReadItemArguments1;
  Arguments[1] := ReadItemArguments2;
  Arguments[2] := ReadItemArguments3;
  Arguments[3] := ReadItemArguments4;

  // Instantiate the client object
  Client := CoEasyDAClient.Create;

  TVarData(Results).VType := varArray or varVariant;
  TVarData(Results).VArray := PVarArray(
    Client.ReadMultipleItemValues(Arguments));

  // Display results
  for I := VarArrayLowBound(Results, 1) to VarArrayHighBound(Results, 1) do
  begin
      ValueResult := IInterface(Results[I]) as _ValueResult;

      if ValueResult.Succeeded then
        WriteLn('results(', i, ').Value: ', ValueResult.Value)
      else
        WriteLn('results(', i, ') *** Failure: ', ValueResult.ErrorMessageBrief);
  end;

  VarClear(Results);
  VarClear(Arguments);
end;

// This example shows how to read the values of 4 different items at once.

mle_outputtext.Text = ""

// Instantiate the client object
OLEObject client
client = CREATE OLEObject
client.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient")

// Prepare arguments.

OLEObject readItemArguments1
readItemArguments1 = CREATE OLEObject
readItemArguments1.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
readItemArguments1.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
readItemArguments1.ItemDescriptor.ItemID = "Simulation.Random"

OLEObject readItemArguments2
readItemArguments2 = CREATE OLEObject
readItemArguments2.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
readItemArguments2.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
readItemArguments2.ItemDescriptor.ItemID = "Trends.Ramp (1 min)"

OLEObject readItemArguments3
readItemArguments3 = CREATE OLEObject
readItemArguments3.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
readItemArguments3.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
readItemArguments3.ItemDescriptor.ItemID = "Trends.Sine (1 min)"

OLEObject readItemArguments4
readItemArguments4 = CREATE OLEObject
readItemArguments4.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
readItemArguments4.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
readItemArguments4.ItemDescriptor.ItemID = "Simulation.Register_I4"

OLEObject readItemArgumentsList
readItemArgumentsList = CREATE OLEObject
readItemArgumentsList.ConnectToNewObject("OpcLabs.BaseLib.Collections.ElasticVector")
readItemArgumentsList.Add(readItemArguments1)
readItemArgumentsList.Add(readItemArguments2)
readItemArgumentsList.Add(readItemArguments3)
readItemArgumentsList.Add(readItemArguments4)

// Obtain values.
OLEObject valueResultList
valueResultList = client.ReadItemValueList(readItemArgumentsList)

// Display results
Int i
FOR i = 0 TO valueResultList.Count - 1
    OLEObject valueResult
    valueResult = valueResultList.Item[i]
    IF valueResult.Succeeded THEN
        mle_outputtext.Text = mle_outputtext.Text + "valueResult[" + String(i) + "].Value: " + String(valueResult.Value) + "~r~n"
    ELSE
        mle_outputtext.Text = mle_outputtext.Text + "valueResult[" + String(i) + "] *** Failure: " + valueResult.ErrorMessageBrief + "~r~n"
    END IF    
NEXT

Rem This example shows how to read values of 4 items at once, and display them.

Private Sub ReadMultipleItemValues_Main_Command_Click()
    OutputText = ""
    
    Dim readArguments1 As New DAReadItemArguments
    readArguments1.serverDescriptor.ServerClass = "OPCLabs.KitServer.2"
    readArguments1.ItemDescriptor.itemId = "Simulation.Random"
    
    Dim readArguments2 As New DAReadItemArguments
    readArguments2.serverDescriptor.ServerClass = "OPCLabs.KitServer.2"
    readArguments2.ItemDescriptor.itemId = "Trends.Ramp (1 min)"
    
    Dim readArguments3 As New DAReadItemArguments
    readArguments3.serverDescriptor.ServerClass = "OPCLabs.KitServer.2"
    readArguments3.ItemDescriptor.itemId = "Trends.Sine (1 min)"
    
    Dim readArguments4 As New DAReadItemArguments
    readArguments4.serverDescriptor.ServerClass = "OPCLabs.KitServer.2"
    readArguments4.ItemDescriptor.itemId = "Simulation.Register_I4"
    
    Dim arguments(3) As Variant
    Set arguments(0) = readArguments1
    Set arguments(1) = readArguments2
    Set arguments(2) = readArguments3
    Set arguments(3) = readArguments4

    ' Instantiate the client object
    Dim client As New EasyDAClient

    Dim results() As Variant
    results = client.ReadMultipleItemValues(arguments)

    ' Display results
    Dim i: For i = LBound(results) To UBound(results)
        Dim valueResult As valueResult: Set valueResult = results(i)
        If valueResult.Succeeded Then
            OutputText = OutputText & "results(" & i & ").Value: " & valueResult.value & vbCrLf
        Else
            OutputText = OutputText & "results(" & i & ") *** Failure: " & valueResult.ErrorMessageBrief & vbCrLf
        End If
    Next
End Sub

Rem This example shows how to read values of 4 items at once, and display them.

Option Explicit

Dim ReadItemArguments1: Set ReadItemArguments1 = CreateObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
ReadItemArguments1.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
ReadItemArguments1.ItemDescriptor.ItemID = "Simulation.Random"

Dim ReadItemArguments2: Set ReadItemArguments2 = CreateObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
ReadItemArguments2.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
ReadItemArguments2.ItemDescriptor.ItemID = "Trends.Ramp (1 min)"

Dim ReadItemArguments3: Set ReadItemArguments3 = CreateObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
ReadItemArguments3.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
ReadItemArguments3.ItemDescriptor.ItemID = "Trends.Sine (1 min)"

Dim ReadItemArguments4: Set ReadItemArguments4 = CreateObject("OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments")
ReadItemArguments4.ServerDescriptor.ServerClass = "OPCLabs.KitServer.2"
ReadItemArguments4.ItemDescriptor.ItemID = "Simulation.Register_I4"

Dim arguments(3)
Set arguments(0) = ReadItemArguments1
Set arguments(1) = ReadItemArguments2
Set arguments(2) = ReadItemArguments3
Set arguments(3) = ReadItemArguments4

Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient")
Dim results: results = Client.ReadMultipleItemValues(arguments)

Dim i: For i = LBound(results) To UBound(results)
    Dim ValueResult: Set ValueResult = results(i)
    If ValueResult.Succeeded Then
        WScript.Echo "results(" & i & ").Value: " & ValueResult.Value
    Else
        WScript.Echo "results(" & i & ") *** Failure: " & ValueResult.ErrorMessageBrief
    End If
Next

Conceptual

Reading just the value (OPC Classic)

Examples - OPC Unified Architecture

Examples - OPC Unified Architecture - Read multiple values