QuickOPC User's Guide and Reference
FindGdsRegistrations Method (EasyUAApplicationCore)
Example 



View with Navigation Tools
OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Application Namespace > EasyUAApplicationCore Class : FindGdsRegistrations Method
The endpoint of OPC UA Global Discovery Server (GDS).
Finds all registrations for this application URI in the GDS.
Syntax
'Declaration
 
Public Function FindGdsRegistrations( _
   ByVal gdsEndpointDescriptor As UAEndpointDescriptor _
) As IReadOnlyDictionary(Of UANodeId,UAApplicationElement)
 
'Usage
 
Dim instance As EasyUAApplicationCore
Dim gdsEndpointDescriptor As UAEndpointDescriptor
Dim value As IReadOnlyDictionary(Of UANodeId,UAApplicationElement)
 
value = instance.FindGdsRegistrations(gdsEndpointDescriptor)

Parameters

gdsEndpointDescriptor
The endpoint of OPC UA Global Discovery Server (GDS).

Return Value

Returns a dictionary of OpcLabs.EasyOpc.UA.Discovery.UAApplicationElement objects with application registration information, keyed by a OpcLabs.EasyOpc.UA.AddressSpace.UANodeId which is the application ID identifying the registration in the GDS.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

The OPC UA operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

Remarks

The identity of the application itself is carried by its application URI, as given by the OpcLabs.EasyOpc.UA.Discovery.UAApplicationElement.ApplicationUriString returned by the OpcLabs.EasyOpc.UA.Application.Extensions.IEasyUAClientServerApplicationExtension.GetApplicationElement. Methods on this interface that manipulate or inspect the GDS registration use the application URI to identify the registration records belonging to this application.

Example

.NET

COM

// Shows how to find all application's registrations in the GDS.
// In order to be able to find the registration, run the example for the RegisterToGds method first.

using System;
using System.Collections.Generic;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.AddressSpace;
using OpcLabs.EasyOpc.UA.Application;
using OpcLabs.EasyOpc.UA.Application.Extensions;
using OpcLabs.EasyOpc.UA.Discovery;
using OpcLabs.EasyOpc.UA.Extensions;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples.Application._IEasyUAClientServerApplication
{
    class FindGdsRegistrations
    {
        public static void Main1()
        {
            // Define which GDS we will work with.
            UAEndpointDescriptor gdsEndpointDescriptor =
                ((UAEndpointDescriptor)"opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer")
                .WithUserNameIdentity("appadmin", "demo");

            // Obtain the application interface.
            EasyUAApplication application = EasyUAApplication.Instance;

            // Display which application we are about to work with.
            Console.WriteLine("Application URI string: {0}",
                application.GetApplicationElement().ApplicationUriString);

            // Find all application's registrations in the GDS.
            IReadOnlyDictionary<UANodeId, UAApplicationElement> applicationElementDictionary;
            try
            {
                applicationElementDictionary = application.FindGdsRegistrations(gdsEndpointDescriptor);
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
                return;
            }

            // Display results
            foreach (KeyValuePair<UANodeId, UAApplicationElement> pair in applicationElementDictionary)
            {
                Console.WriteLine();
                Console.WriteLine("Application ID: {0}", pair.Key);

                UAApplicationElement applicationElement = pair.Value;
                Console.WriteLine("Application element: {0}", applicationElement);
                Console.WriteLine("  Application URI string: {0}", applicationElement.ApplicationUriString);
                Console.WriteLine("  Discovery URI strings: {0}", applicationElement.DiscoveryUriStrings);
                Console.WriteLine("  Product URI string: {0}", applicationElement.ProductUriString);
            }
        }
    }
}
// Shows how to find all application's registrations in the GDS.

class procedure FindGdsRegistrations.Main;
var
  Application: TEasyUAApplication;
  ApplicationElement: _UAApplicationElement;
  ApplicationElementDictionary: _UANodeIdUAApplicationElementReadOnlyDictionary;
  ApplicationId: _UANodeId;
  Count: Cardinal;
  Element: OleVariant;
  Enumerator: IEnumVARIANT;
  GdsEndpointDescriptor: _UAEndpointDescriptor;
begin
  // Define which GDS we will work with.
  GdsEndpointDescriptor := CoUAEndpointDescriptor.Create;
  GdsEndpointDescriptor.UrlString := 'opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer';
  GdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.UserName := 'appadmin';
  GdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.Password := 'demo';

  // Obtain the application interface.
  Application := TEasyUAApplication.Create(nil);

  // Display which application we are about to work with.
  WriteLn('Application URI string: ', Application.GetApplicationElement.ApplicationUriString);

  // Find all application's registrations in the GDS.
  try
    ApplicationElementDictionary := Application.FindGdsRegistrations(GdsEndpointDescriptor);
  except
    on E: EOleException do
    begin
      WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
    end;
  end;

  // Display results
  Enumerator := ApplicationElementDictionary.GetEnumerator;
  while (Enumerator.Next(1, Element, Count) = S_OK) do
  begin
    WriteLn;
    ApplicationId := IUnknown(Element.Key) as _UANodeId;
    WriteLn('Application ID: ', ApplicationId.ToString);

    ApplicationElement := IUnknown(Element.Value) as _UAApplicationElement;
    WriteLn('  Application URI string: ', ApplicationElement.ApplicationUriString);
    WriteLn('  Discovery URI string: ', ApplicationElement.DiscoveryUriString);
    WriteLn('  Product URI string: ', ApplicationElement.ProductUriString);
  end;
end;
Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

See Also