'Declaration
 
<ExtensionAttribute()>
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function DiscoverGlobalApplications( _
   ByVal client As IEasyUAClient, _
   ByVal gdsEndpointDescriptor As UAEndpointDescriptor, _
   ByVal queryApplicationsFilter As UAQueryApplicationsFilter, _
   ByVal flat As Boolean _
) As UADiscoveryElementCollection

'Usage
 
Dim client As IEasyUAClient
Dim gdsEndpointDescriptor As UAEndpointDescriptor
Dim queryApplicationsFilter As UAQueryApplicationsFilter
Dim flat As Boolean
Dim value As UADiscoveryElementCollection
 
value = IEasyUAClientExtension.DiscoverGlobalApplications(client, gdsEndpointDescriptor, queryApplicationsFilter, flat)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public static UADiscoveryElementCollection DiscoverGlobalApplications( 
   IEasyUAClient client,
   UAEndpointDescriptor gdsEndpointDescriptor,
   UAQueryApplicationsFilter queryApplicationsFilter,
   bool flat
)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public:
static UADiscoveryElementCollection^ DiscoverGlobalApplications( 
   IEasyUAClient^ client,
   UAEndpointDescriptor^ gdsEndpointDescriptor,
   UAQueryApplicationsFilter^ queryApplicationsFilter,
   bool flat
) 

Parameters

client

The client object that will perform the operation.

gdsEndpointDescriptor

The endpoint descriptor of the Global Discover Server (GDS) that will be used for performing the discovery.

queryApplicationsFilter

A filter used to find servers that meet the specified criteria.

flat

Determines whether one element will be returned for each discovery URI.

Return Value

This method uses the so-called OPC UA Global Discovery Server (GDS).

When the flat parameter is false, the discovery query returns one OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement for each application found, and its OpcLabs.EasyOpc.UA.Discovery.IUAReadOnlyApplicationElement.DiscoveryUriStrings property contains one or more application discovery URLs.

When the flat parameter is true, the discovery query returns one OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement for each discovery URL of each application found. In this case, the OpcLabs.EasyOpc.UA.Discovery.IUAReadOnlyApplicationElement.DiscoveryUriStrings property of each returned application element contains precisely one string, and you can therefore use the OpcLabs.EasyOpc.UA.Discovery.IUAReadOnlyApplicationElement.DiscoveryUriString property instead to obtain the discovery URL.

See also in Knowledge Base: Technical note-OPC UA Discovery in QuickOPC.

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