// 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 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 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
