// This example shows how to define a custom folder class which implements writing to its data variables.
// You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-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.BaseLib.NodeSpace;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.NodeSpace;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UAServerDocExamples._UAServerNode
{
class OnWrite
{
/// <summary>
/// A folder in the OPC UA address space, with specialized write behavior.
/// </summary>
class FolderWithOnWrite : UAFolder
{
public FolderWithOnWrite(string name) : base(name)
{
}
/// <summary>
/// Processes the supplied OPC UA write data.
/// </summary>
/// <param name="e">The event arguments.</param>
protected override void OnWrite(UADataVariableWriteEventArgs e)
{
// Obtain the state associated with the data variable that is being written, and display it on the console
// together with the new value.
Console.WriteLine($"Data variable {e.DataVariable.State}, value written: {e.AttributeData.Value}");
}
}
public static void Main1()
{
// Instantiate the server object.
// By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
var server = new EasyUAServer();
// Create a folder node.
var myFolder = new FolderWithOnWrite("MyFolder");
server.Add(myFolder);
// Create data variables in the folder. Distinguish them by their state.
myFolder.Add(new UADataVariable("MyDataVariable1").ValueType<int>().SetState(1));
myFolder.Add(new UADataVariable("MyDataVariable2").ValueType<int>().SetState(2));
myFolder.Add(new UADataVariable("MyDataVariable3").ValueType<int>().SetState(3));
myFolder.Add(new UADataVariable("MyDataVariable4").ValueType<int>().SetState(4));
myFolder.Add(new UADataVariable("MyDataVariable5").ValueType<int>().SetState(5));
// Start the server.
Console.WriteLine("The server is starting...");
server.Start();
Console.WriteLine("The server is started.");
Console.WriteLine();
// Let the user decide when to stop.
Console.WriteLine("Press Enter to stop the server...");
Console.ReadLine();
// Stop the server.
Console.WriteLine("The server is stopping...");
server.Stop();
Console.WriteLine("The server is stopped.");
}
}
}