// This example shows how to read an item synchronously, and display its value, timestamp and quality.
using System;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.OperationModel;
namespace DocExamples.DataAccess._EasyDAClient
{
partial class ReadItem
{
public static void Synchronous()
{
// Instantiate the client object.
var client = new EasyDAClient();
// Specify that only synchronous method is allowed. By default, both synchronous and asynchronous methods are
// allowed, and the component picks a suitable method automatically. Disallowing asynchronous method leaves
// only the synchronous method available for selection.
client.InstanceParameters.Mode.AllowAsynchronousMethod = false;
DAVtq vtq;
try
{
vtq = client.ReadItem("", "OPCLabs.KitServer.2", "Simulation.Random");
}
catch (OpcException opcException)
{
Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message);
return;
}
Console.WriteLine("Vtq: {0}", vtq);
}
}
}
# This example shows how to read an item synchronously, and display its value, timestamp and quality.
# 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()
# Specify that only synchronous method is allowed. By default, both synchronous and asynchronous methods are
# allowed, and the component picks a suitable method automatically. Disallowing asynchronous method leaves
# only the synchronous method available for selection.
client.InstanceParameters.Mode.AllowAsynchronousMethod = False
# Perform the operation.
try:
vtq = IEasyDAClientExtension.ReadItem(client, '', 'OPCLabs.KitServer.2', 'Simulation.Random')
except OpcException as opcException:
print('*** Failure: ' + opcException.GetBaseException().Message)
exit()
# Display results.
print('Vtq: ', vtq, sep='')
