OPC Studio User's Guide and Reference
FindFileOrDirectory(IEasyUAFileTransfer,UAEndpointDescriptor,UANodeDescriptor,String) Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.FileTransfer Namespace > IEasyUAFileTransferExtension Class > FindFileOrDirectory Method : FindFileOrDirectory(IEasyUAFileTransfer,UAEndpointDescriptor,UANodeDescriptor,String) Method
The OPC UA file transfer object that will perform the operation.
Endpoint descriptor. Identifies the OPC-UA server.
Node descriptor of the OPC UA directory.
Name of the file or directory to be found.
Finds a file or directory object under the specified parent directory.
Syntax
'Declaration
 
<ExtensionAttribute()>
<CanBeNullAttribute()>
Public Overloads Shared Function FindFileOrDirectory( _
   ByVal fileTransfer As IEasyUAFileTransfer, _
   ByVal endpointDescriptor As UAEndpointDescriptor, _
   ByVal directoryNodeDescriptor As UANodeDescriptor, _
   ByVal fileOrDirectoryName As String _
) As UANodeDescriptor
'Usage
 
Dim fileTransfer As IEasyUAFileTransfer
Dim endpointDescriptor As UAEndpointDescriptor
Dim directoryNodeDescriptor As UANodeDescriptor
Dim fileOrDirectoryName As String
Dim value As UANodeDescriptor
 
value = IEasyUAFileTransferExtension.FindFileOrDirectory(fileTransfer, endpointDescriptor, directoryNodeDescriptor, fileOrDirectoryName)

Parameters

fileTransfer
The OPC UA file transfer object that will perform the operation.
endpointDescriptor
Endpoint descriptor. Identifies the OPC-UA server.
directoryNodeDescriptor
Node descriptor of the OPC UA directory.
fileOrDirectoryName
Name of the file or directory to be found.

Return Value

Returns a node descriptor of the file or directory object, if the file or directory was found. Returns null otherwise.
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.

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