// This example shows how to read and display value of a single item. // One of the shortest examples possible. // // 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.DataAccess; using OpcLabs.EasyOpc.OperationModel; namespace DocExamples.DataAccess._EasyDAClient { partial class ReadItemValue { public static void Main1() { // Instantiate the client object. var client = new EasyDAClient(); Console.WriteLine("Reading item value..."); object value; try { value = client.ReadItemValue("", "OPCLabs.KitServer.2", "Demo.Ramp"); } catch (OpcException opcException) { Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message); return; } Console.WriteLine(value); } } }
# This example shows how to read and display value of a single item. # One of the shortest examples possible. # # 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.DataAccess using namespace OpcLabs.EasyOpc.OperationModel # 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 Write-Host "Reading item value..." try { $value = [IEasyDAClientExtension]::ReadItemValue($client, "", "OPCLabs.KitServer.2", "Demo.Ramp") } catch [OpcException] { Write-Host "*** Failure: $($PSItem.Exception.GetBaseException().Message)" return } Write-Host $value
' This example shows how to read and display value of a single item. ' One of the shortest examples possible. ' ' 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.DataAccess Imports OpcLabs.EasyOpc.OperationModel Namespace DataAccess._EasyDAClient Partial Friend Class ReadItemValue Public Shared Sub Main1() Dim client As New EasyDAClient() Console.WriteLine("Reading item...") Try Console.WriteLine(client.ReadItemValue("", "OPCLabs.KitServer.2", "Demo.Ramp")) Catch opcException As OpcException Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message) Exit Sub End Try End Sub End Class End Namespace
// This example shows how to read value of a single item, and display it. // // 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. $Client = new COM("OpcLabs.EasyOpc.DataAccess.EasyDAClient"); try { $value = $Client->ReadItemValue("", "OPCLabs.KitServer.2", "Simulation.Random"); } catch (com_exception $e) { printf("*** Failure: %s\n", $e->getMessage()); Exit(); } printf("value: %s\n", $value);
// This example shows how to read values of a single item, and display it. // // 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. var Client = new ActiveXObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient"); var value = Client.ReadItemValue("", "OPCLabs.KitServer.2", "Simulation.Random"); WScript.Echo("value: " + value);
// This example shows how to read value of a single item, and display it. // // 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 ReadItemValue.Main; var Client: OpcLabs_EasyOpcClassic_TLB._EasyDAClient; Value: OleVariant; begin // Instantiate the client object Client := CoEasyDAClient.Create; try Value := Client.ReadItemValue('', 'OPCLabs.KitServer.2', 'Simulation.Random'); except on E: EOleException do begin WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message])); Exit; end; end; // Display results WriteLn('Value: ', Value); end;
// This example shows how to read and display value of a single item. // One of the shortest examples possible. mle_outputtext.Text = "" // Instantiate the client object OLEObject client client = CREATE OLEObject client.ConnectToNewObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient") // Obtain value of a node mle_outputtext.Text = mle_outputtext.Text + "Reading item value..." + "~r~n" Any value TRY value = client.ReadItemValue("", "OPCLabs.KitServer.2", "Demo.Ramp") CATCH (OLERuntimeError oleRuntimeError) mle_outputtext.Text = mle_outputtext.Text + "*** Failure: " + oleRuntimeError.Description + "~r~n" RETURN END TRY // Display results mle_outputtext.Text = mle_outputtext.Text + String(value) + "~r~n"
# This example shows how to read value of a single item, and display it. # # The Python for Windows (pywin32) extensions package is needed. Install it using "pip install pypiwin32". # CAUTION: We now recommend using Python.NET package instead. Full set of examples with Python.NET is available! # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . import win32com.client from pywintypes import com_error # Instantiate the client object client = win32com.client.Dispatch('OpcLabs.EasyOpc.DataAccess.EasyDAClient') # Perform the operation try: value = client.ReadItemValue('', 'OPCLabs.KitServer.2', 'Demo.Single') except com_error as e: print('*** Failure: ' + e.args[2][1] + ': ' + e.args[2][2]) exit() # Display results print('value: ', value)
REM This example shows how to read value of a single item, and display it. 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 ReadItemValue_Main_Command_Click() OutputText = "" ' Instantiate the client object Dim client As New EasyDAClient On Error Resume Next Dim value value = client.ReadItemValue("", "OPCLabs.KitServer.2", "Simulation.Random") 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 & "Value: " & value & vbCrLf End Sub
Rem This example shows how to read value of a single item, and display it. 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 Client: Set Client = CreateObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient") On Error Resume Next Dim value: value = Client.ReadItemValue("", "OPCLabs.KitServer.2", "Simulation.Random") If Err.Number <> 0 Then WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description WScript.Quit End If On Error Goto 0 WScript.Echo "value: " & value
# This example shows how to read value of a single item, and display it. # # 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.DataAccess import * from OpcLabs.EasyOpc.OperationModel import * # Instantiate the client object client = EasyDAClient() print('Reading item value...') try: value = IEasyDAClientExtension.ReadItemValue(client, '', 'OPCLabs.KitServer.2', 'Demo.Single') except OpcException as opcException: print('*** Failure: ' + opcException.GetBaseException().Message, sep='') exit() # Display results print('value: ', value, sep='')
// This example shows how to read value of a single item, and display it, using CLSID instead of ProgID of the OPC Server. // // 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.DataAccess; using OpcLabs.EasyOpc.OperationModel; namespace DocExamples.DataAccess._EasyDAClient { partial class ReadItemValue { public static void CLSID() { // Instantiate the client object. var client = new EasyDAClient(); Console.WriteLine("Reading item value..."); object value; try { value = client.ReadItemValue("", "{C8A12F17-1E03-401E-B53D-6C654DD576DA}", "Simulation.Random"); } catch (OpcException opcException) { Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message); return; } Console.WriteLine($"value: {value}"); } } }
' This example shows how to read value of a single item, and display it, using CLSID instead of ProgID of the OPC Server. ' ' 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.DataAccess Imports OpcLabs.EasyOpc.OperationModel Namespace DataAccess._EasyDAClient Partial Friend Class ReadItemValue Public Shared Sub CLSID() ' Instantiate the client object. Dim client As New EasyDAClient() Console.WriteLine("Reading item value...") Dim value As Object Try value = client.ReadItemValue("", "{C8A12F17-1E03-401E-B53D-6C654DD576DA}", "Simulation.Random") Catch opcException As OpcException Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message) Exit Sub End Try Console.WriteLine($"value: {value}") End Sub End Class End Namespace
Rem This example shows how to read value of a single item, and display it, using CLSID instead of ProgID of the OPC Server. 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 Client: Set Client = CreateObject("OpcLabs.EasyOpc.DataAccess.EasyDAClient") On Error Resume Next Dim value: value = Client.ReadItemValue("", "{C8A12F17-1E03-401E-B53D-6C654DD576DA}", "Simulation.Random") If Err.Number <> 0 Then WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description WScript.Quit End If On Error Goto 0 WScript.Echo "value: " & value
# This example shows how to read value of a single item, and display it, using CLSID instead of ProgID of the OPC # Server. # # 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 import * from OpcLabs.EasyOpc.DataAccess import * from OpcLabs.EasyOpc.OperationModel import * # Instantiate the client object client = EasyDAClient() print('Reading item value...') try: value = IEasyDAClientExtension.ReadItemValue(client, '', '{C8A12F17-1E03-401E-B53D-6C654DD576DA}', 'Simulation.Random') except OpcException as opcException: print('*** Failure: ' + opcException.GetBaseException().Message, sep='') exit() # Display results print('value: ', value, sep='')
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