'Declaration
<ExtensionAttribute()> <NotNullAttribute()> Public Overloads Shared Function GetFile( _ ByVal fileTransfer As IEasyUAFileTransfer, _ ByVal endpointDescriptor As UAEndpointDescriptor, _ ByVal fileNamedNodeDescriptor As UANamedNodeDescriptor _ ) As UANodeDescriptor
'Usage
Dim fileTransfer As IEasyUAFileTransfer Dim endpointDescriptor As UAEndpointDescriptor Dim fileNamedNodeDescriptor As UANamedNodeDescriptor Dim value As UANodeDescriptor value = IEasyUAFileTransferExtension.GetFile(fileTransfer, endpointDescriptor, fileNamedNodeDescriptor)
[Extension()] [NotNull()] public static UANodeDescriptor GetFile( IEasyUAFileTransfer fileTransfer, UAEndpointDescriptor endpointDescriptor, UANamedNodeDescriptor fileNamedNodeDescriptor )
[Extension()] [NotNull()] public: static UANodeDescriptor^ GetFile( IEasyUAFileTransfer^ fileTransfer, UAEndpointDescriptor^ endpointDescriptor, UANamedNodeDescriptor^ fileNamedNodeDescriptor )
Parameters
- fileTransfer
- The OPC UA file transfer object that will perform the operation.
This is typically the EasyUAFileTransferClient object.
The value of this parameter cannot be
null
(Nothing
in Visual Basic). - endpointDescriptor
- Endpoint descriptor. Identifies the OPC-UA server.
Because the OpcLabs.EasyOpc.UA.UAEndpointDescriptor has implicit conversions from System.String and System.Uri, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a string (representing the endpoint URL, or a so-called OPC UA endpoint descriptor string), or a System.Uri object, in place of this parameter, and the corresponding endpoint descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.UAEndpointDescriptor.FromString or OpcLabs.EasyOpc.UA.UAEndpointDescriptor.FromUri static method instead.
Also, because the OpcLabs.EasyOpc.UA.Discovery.UAApplicationElement and OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement have an implicit conversion to OpcLabs.EasyOpc.UA.UAEndpointDescriptor, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.Discovery.UAApplicationElement or OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement (results from OPC UA discovery) in place of this parameter, and the corresponding endpoint descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can convert a (non-null) OpcLabs.EasyOpc.UA.Discovery.UAApplicationElement or OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement to OpcLabs.EasyOpc.UA.UAEndpointDescriptor using the ToUAEndpointDescriptor or ToUAEndpointDescriptor method instead.
If you are using OPC Wizard (for server development), an implicit conversion from OpcLabs.EasyOpc.UA.EasyUAServerCore can be used in the same way to simply pass the server object in place of this parameter, which will use its OpcLabs.EasyOpc.UA.EasyUAServerCore.EffectiveServerDescriptor property for the connection.
The value of this parameter cannot be
null
(Nothing
in Visual Basic). - fileNamedNodeDescriptor
- A named node descriptor of the file to be obtained.
Because the OpcLabs.EasyOpc.UA.Navigation.UANamedNodeDescriptor has an implicit conversion from OpcLabs.EasyOpc.UA.UANodeDescriptor, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.UANodeDescriptor (containing the final node descriptor) in place of this parameter, and the corresponding OPC UA named node descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.Navigation.UANamedNodeDescriptor.FromUANodeDescriptor static method instead.
The value of this parameter cannot be
null
(Nothing
in Visual Basic).
Return Value
Because there are implicit conversions to OpcLabs.EasyOpc.UA.Navigation.UANamedNodeDescriptor and OpcLabs.EasyOpc.UA.Navigation.UANamedNodePath from OpcLabs.EasyOpc.UA.UANodeDescriptor, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use the returned OpcLabs.EasyOpc.UA.UANodeDescriptor in any place where OpcLabs.EasyOpc.UA.Navigation.UANamedNodeDescriptor is expected (in this case the OpcLabs.EasyOpc.UA.UANodeDescriptor contains the final node descriptor) or where OpcLabs.EasyOpc.UA.Navigation.UANamedNodePath is expected (in this case the OpcLabs.EasyOpc.UA.UANodeDescriptor contains the base and only node in the named node path), and the corresponding OPC UA named node descriptor or named node path will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.Navigation.UANamedNodeDescriptor.FromUANodeDescriptor or OpcLabs.EasyOpc.UA.Navigation.UANamedNodePath.FromUANodeDescriptor static method instead.
This method never returns null
(Nothing
in Visual Basic).