BrowseCertificateGroups Method (_EasyUACertificateManagementClient)

Browses the certificate groups available in the Certificate Management information model.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Function BrowseCertificateGroups( _
   ByVal gdsEndpointDescriptor As Object _
) As UACertificateGroupElementCollection

'Usage
 
Dim instance As _EasyUACertificateManagementClient
Dim gdsEndpointDescriptor As Object
Dim value As UACertificateGroupElementCollection
 
value = instance.BrowseCertificateGroups(gdsEndpointDescriptor)

[ElementsNotNull()]
[NotNull()]
UACertificateGroupElementCollection BrowseCertificateGroups( 
   object gdsEndpointDescriptor
)

[ElementsNotNull()]
[NotNull()]
UACertificateGroupElementCollection^ BrowseCertificateGroups( 
   Object^ gdsEndpointDescriptor
)

Parameters

gdsEndpointDescriptor: Endpoint descriptor. Identifies the OPC-UA server. The server must be a Global Directory Server (GDS).

Return Value

The method returns a certificate group element collection, which contains OpcLabs.EasyOpc.UA.Gds.UACertificateGroupElement values. Each element contains information about a particular certificate group found.

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	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.
OpcLabs.EasyOpc.UA.OperationModel.UAException	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.

System.ArgumentNullException

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.

OpcLabs.EasyOpc.UA.OperationModel.UAException

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.

Example

// Shows how to browse and display the certificate groups available in the Certificate Manager.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .

using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.Gds;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples.Gds._EasyUACertificateManagementClient
{
    class BrowseCertificateGroups
    {
        public static void Main1()
        {
            // Define which GDS we will work with.
            UAEndpointDescriptor gdsEndpointDescriptor = "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer";

            // Instantiate the certificate management client object.
            var certificateManagementClient = new EasyUACertificateManagementClient();

            // Browse the certificate groups available in the GDS.
            UACertificateGroupElementCollection certificateGroupElementCollection;
            try
            {
                certificateGroupElementCollection = certificateManagementClient.BrowseCertificateGroups(gdsEndpointDescriptor);
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
                return;
            }

            // Display results
            foreach (UACertificateGroupElement certificateGroupElement in certificateGroupElementCollection)
            {
                Console.WriteLine(certificateGroupElement);
            }
        }
    }
}

# Shows how to browse and display the certificate groups available in the Certificate Manager.
#
# 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 .
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.Gds import *
from OpcLabs.EasyOpc.UA.OperationModel import *


# Define which GDS we will work with.
gdsEndpointDescriptor = UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer')

# Instantiate the certificate management client object.
certificateManagementClient = EasyUACertificateManagementClient()

# Browse the certificate groups available in the GDS.
try:
    certificateGroupElementCollection = certificateManagementClient.BrowseCertificateGroups(gdsEndpointDescriptor)
except UAException as uaException:
    print('*** Failure: ' + uaException.GetBaseException().Message)
    exit()

# Display results.
for certificateGroupElement in certificateGroupElementCollection:
    print(certificateGroupElement)

print()
print('Finished.')

' Shows how to browse and display the certificate groups available in the Certificate Manager.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .

Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.Discovery
Imports OpcLabs.EasyOpc.UA.Gds
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace Gds._EasyUACertificateManagementClient
    Friend Class BrowseCertificateGroups
        Public Shared Sub Main1()
            ' Define which GDS we will work with.
            Dim gdsEndpointDescriptor As UAEndpointDescriptor = "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer"

            ' Instantiate the certificate management client object
            Dim certificateManagementClient = New EasyUACertificateManagementClient()

            ' Browse the certificate groups available in the GDS.
            Dim certificateGroupElementCollection As UACertificateGroupElementCollection
            Try
                certificateGroupElementCollection = certificateManagementClient.BrowseCertificateGroups(gdsEndpointDescriptor)
            Catch uaException As UAException
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message)
                Exit Sub
            End Try

            ' Display results
            For Each certificateGroupElement As UACertificateGroupElement In certificateGroupElementCollection
                Console.WriteLine(certificateGroupElement)
            Next certificateGroupElement
        End Sub
    End Class
End Namespace

Requirements

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

Reference

_EasyUACertificateManagementClient Interface
_EasyUACertificateManagementClient Members

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