// This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). // The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. // // 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.UA; using OpcLabs.EasyOpc.UA.Discovery; using OpcLabs.EasyOpc.UA.OperationModel; namespace UADocExamples._EasyUAClient { partial class DiscoverGlobalServers { public static void Main1() { // Instantiate the client object. var client = new EasyUAClient(); // Obtain collection of application elements. UADiscoveryElementCollection discoveryElementCollection; try { discoveryElementCollection = client.DiscoverGlobalServers( "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer"); } catch (UAException uaException) { Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}"); return; } // Display results. foreach (UADiscoveryElement discoveryElement in discoveryElementCollection) { Console.WriteLine(); Console.WriteLine($"Server name: {discoveryElement.ServerName}"); Console.WriteLine($"Discovery URI string: {discoveryElement.DiscoveryUriString}"); Console.WriteLine($"Server capabilities: {discoveryElement.ServerCapabilities}"); } } } }
# This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). # The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . # OPC client and subscriber examples in PowerShell on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PowerShell . # 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. #requires -Version 5.1 using namespace OpcLabs.EasyOpc.UA using namespace OpcLabs.EasyOpc.UA.Discovery using namespace OpcLabs.EasyOpc.UA.OperationModel # The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows . Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUA.dll" Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUAComponents.dll" # Instantiate the client object. $client = New-Object EasyUAClient # Obtain collection of application elements. try { $discoveryElementCollection = [IEasyUAClientExtension]::DiscoverGlobalServers($client, "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer") } catch [UAException] { Write-Host "*** Failure: $($PSItem.Exception.GetBaseException().Message)" return } # Display results. foreach ($discoveryElement in $discoveryElementCollection) { Write-Host Write-Host "Server name: $($discoveryElement.ServerName)" Write-Host "Discovery URI string: $($discoveryElement.DiscoveryUriString)" Write-Host "Server capabilities: $($discoveryElement.ServerCapabilities)" } # Example output: #
' This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). ' The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. ' ' 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.UA Imports OpcLabs.EasyOpc.UA.Discovery Imports OpcLabs.EasyOpc.UA.OperationModel Namespace _EasyUAClient Partial Friend Class DiscoverGlobalServers Public Shared Sub Main1() ' Instantiate the client object Dim client = New EasyUAClient() ' Obtain collection of application elements Dim discoveryElementCollection As UADiscoveryElementCollection Try discoveryElementCollection = client.DiscoverGlobalServers("opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer") Catch uaException As UAException Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message) Exit Sub End Try ' Display results For Each discoveryElement As UADiscoveryElement In discoveryElementCollection Console.WriteLine() Console.WriteLine("Server name: {0}", discoveryElement.ServerName) Console.WriteLine("Discovery URI string: {0}", discoveryElement.DiscoveryUriString) Console.WriteLine("Server capabilities: {0}", discoveryElement.ServerCapabilities) Next discoveryElement End Sub End Class End Namespace
// This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). // The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client and subscriber examples in Object Pascal (Delphi) on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-OP . // 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. class procedure DiscoverGlobalServers.Main; var Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient; Count: Cardinal; Element: OleVariant; DiscoveryElement: _UADiscoveryElement; DiscoveryElementEnumerator: IEnumVariant; DiscoveryElements: _UADiscoveryElementCollection; begin // Instantiate the client object Client := CoEasyUAClient.Create; // Obtain collection of application elements try DiscoveryElements := Client.DiscoverGlobalServers('opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer'); except on E: EOleException do begin WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message])); Exit; end; end; // Display results DiscoveryElementEnumerator := DiscoveryElements.GetEnumerator; while (DiscoveryElementEnumerator.Next(1, Element, Count) = S_OK) do begin DiscoveryElement := IUnknown(Element) as _UADiscoveryElement; WriteLn; WriteLn('Server name: ', DiscoveryElement.ServerName); WriteLn('Discovery URI string: ', DiscoveryElement.DiscoveryUriString); WriteLn('Server capabilities: ', DiscoveryElement.ServerCapabilities.ToString); end; end;
REM This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). REM The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. REM REM Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . REM OPC client and subscriber examples in Visual Basic on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VB . REM Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own REM a commercial license in order to use Online Forums, and we reply to every post. Public Sub DiscoverGlobalServers_Main_Command_Click() OutputText = "" ' Instantiate the client object Dim Client As New EasyUAClient ' Obtain collection of application elements On Error Resume Next Dim DiscoveryElementCollection As UADiscoveryElementCollection Set DiscoveryElementCollection = Client.DiscoverGlobalServers("opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer") If Err.Number <> 0 Then OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf Exit Sub End If On Error GoTo 0 ' Display results Dim DiscoveryElement As UADiscoveryElement: For Each DiscoveryElement In DiscoveryElementCollection OutputText = OutputText & vbCrLf OutputText = OutputText & "Server name: " & DiscoveryElement.ServerName & vbCrLf OutputText = OutputText & "Discovery URI string: " & DiscoveryElement.DiscoveryUriString & vbCrLf OutputText = OutputText & "Server capabilities: " & DiscoveryElement.serverCapabilities.ToString & vbCrLf Next End Sub
# This example shows how to obtain information about OPC UA servers from the Global Discovery Server (GDS). # The result is flat, i.e. each discovery URL is returned in separate element, with possible repetition of the servers. # # 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.UA import * from OpcLabs.EasyOpc.UA.Discovery import * from OpcLabs.EasyOpc.UA.OperationModel import * # Instantiate the client object. client = EasyUAClient() # Obtain collection of application elements. try: discoveryElementCollection = IEasyUAClientExtension.DiscoverGlobalServers(client, UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer')) except UAException as uaException: print('*** Failure: ' + uaException.GetBaseException().Message) exit() # Display results. for discoveryElement in discoveryElementCollection: print() print('Server name: ', discoveryElement.ServerName, sep='') print('Discovery URI string: ', discoveryElement.DiscoveryUriString, sep='') print('Server capabilities: ', discoveryElement.ServerCapabilities, sep='') print() print('Finished.')
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