Hi,
I’m trying to change an OPC UA Console Client into a Winform App.
Here’s the Console code:
using Opc.Ua;
using Opc.Ua.Client;
using Opc.Ua.Configuration;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net;
namespace MyHomework
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(“Step 1 – Create application configuration and certificate.”);
var config = new ApplicationConfiguration()
{
ApplicationName = “MyHomework”,
ApplicationUri = Utils.Format(@”urn:{0}:MyHomework”, System.Net.Dns.GetHostName()),
ApplicationType = ApplicationType.Client,
SecurityConfiguration = new SecurityConfiguration
{
ApplicationCertificate = new CertificateIdentifier { StoreType = @”Directory”, StorePath = @”%CommonApplicationData%\OPC Foundation\CertificateStores\MachineDefault”, SubjectName = “MyHomework” },
TrustedIssuerCertificates = new CertificateTrustList { StoreType = @”Directory”, StorePath = @”%CommonApplicationData%\OPC Foundation\CertificateStores\UA Certificate Authorities” },
TrustedPeerCertificates = new CertificateTrustList { StoreType = @”Directory”, StorePath = @”%CommonApplicationData%\OPC Foundation\CertificateStores\UA Applications” },
RejectedCertificateStore = new CertificateTrustList { StoreType = @”Directory”, StorePath = @”%CommonApplicationData%\OPC Foundation\CertificateStores\RejectedCertificates” },
AutoAcceptUntrustedCertificates = true
},
TransportConfigurations = new TransportConfigurationCollection(),
TransportQuotas = new TransportQuotas { OperationTimeout = 15000 },
ClientConfiguration = new ClientConfiguration { DefaultSessionTimeout = 60000 },
TraceConfiguration = new TraceConfiguration()
};
config.Validate(ApplicationType.Client).GetAwaiter().GetResult();
if (config.SecurityConfiguration.AutoAcceptUntrustedCertificates)
{
config.CertificateValidator.CertificateValidation += (s, e) => { e.Accept = (e.Error.StatusCode == StatusCodes.BadCertificateUntrusted); };
}
var application = new ApplicationInstance
{
ApplicationName = “MyHomework”,
ApplicationType = ApplicationType.Client,
ApplicationConfiguration = config
};
application.CheckApplicationInstanceCertificate(false, 2048).GetAwaiter().GetResult();
var selectedEndpoint = CoreClientUtils.SelectEndpoint(“opc.tcp://192.168.0.3:62546”, useSecurity: false, operationTimeout: 15000);
Console.WriteLine($”Step 2 – Create a session with your server: {selectedEndpoint.EndpointUrl} “);
using (var session = Session.Create(config, new ConfiguredEndpoint(null, selectedEndpoint, EndpointConfiguration.Create(config)), false, “”, 60000, null, null).GetAwaiter().GetResult())
{
Console.WriteLine(“Step 3 – Browse the server namespace.”);
ReferenceDescriptionCollection refs;
Byte[] cp;
session.Browse(null, null, ObjectIds.ObjectsFolder, 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out cp, out refs);
Console.WriteLine(“DisplayName: BrowseName, NodeClass”);
foreach (var rd in refs)
{
Console.WriteLine(“{0}: {1}, {2}”, rd.DisplayName, rd.BrowseName, rd.NodeClass);
ReferenceDescriptionCollection nextRefs;
byte[] nextCp;
session.Browse(null, null, ExpandedNodeId.ToNodeId(rd.NodeId, session.NamespaceUris), 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out nextCp, out nextRefs);
foreach (var nextRd in nextRefs)
{
Console.WriteLine(“+ {0}: {1}, {2}”, nextRd.DisplayName, nextRd.BrowseName, nextRd.NodeClass);
}
}
Console.WriteLine(“Step 4 – Create a subscription. Set a faster publishing interval if you wish.”);
var subscription = new Subscription(session.DefaultSubscription) { PublishingInterval = 1000 };
Console.WriteLine(“Step 5 – Add a list of items you wish to monitor to the subscription.”);
var list = new List { new MonitoredItem(subscription.DefaultItem) { DisplayName = “CurrentVariableValue”, StartNodeId = “ns=2;i=6” } };
list.ForEach(i => i.Notification += OnNotification);
subscription.AddItems(list);
Console.WriteLine(“Step 6 – Add the subscription to the session.”);
session.AddSubscription(subscription);
subscription.Create();
Console.WriteLine(“Press any key to remove subscription…”);
Console.ReadKey(true);
}
Console.WriteLine(“Press any key to exit…”);
Console.ReadKey(true);
}
private static void OnNotification(MonitoredItem item, MonitoredItemNotificationEventArgs e)
{
foreach (var value in item.DequeueValues())
{
Console.WriteLine(“{0}: {1}, {2}, {3}”, item.DisplayName, value.Value, value.SourceTimestamp, value.StatusCode);
}
}
}
}
When execute the program, it connects to an OPC UA Server, if the variable “CurrentVariableValue” changed, it go to OnNotification and print that value to console.
What I pretend to do is create a Label in Winform, and update label’s text to display variable value.
The problem is, when the console is running, winform still pop-up but I cannot interact with it (even cannot turn it off). When ending OPC UA connection (press any key twice in console), the winform works normally.
Can you suggest me some solution for that?