.NET
// 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.Xml
{
partial class ReadItemValue
{
public static void Main1Xml()
{
// Instantiate the client object.
var client = new EasyDAClient();
Console.WriteLine("Reading item value...");
object value;
try
{
value = client.ReadItemValue("http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx", "Dynamic/Analog Types/Double");
}
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 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.Xml
Partial Friend Class ReadItemValue
Public Shared Sub Main1Xml()
Dim client As New EasyDAClient()
Console.WriteLine("Reading item value...")
Dim value As Object
Try
value = client.ReadItemValue("http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx", "Dynamic/Analog Types/Double")
Catch opcException As OpcException
Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
Exit Sub
End Try
Console.WriteLine(value)
End Sub
End Class
End Namespace
Python
# 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 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, ServerDescriptor('http://opcxml.demo-this.com/XmlDaSampleServer/Service.asmx'), DAItemDescriptor('Dynamic/Analog Types/Double'))
except OpcException as opcException:
print('*** Failure: ' + opcException.GetBaseException().Message, sep='')
exit()
# Display results
print('value: ', value, sep='')
OPC Data Client supports OPC XML-DA also on Linux and macOS.
See Also
Examples - Client OPC Data Access
Concepts
Examples - Client OPC Unified Architecture
