OPC Studio User's Guide and Reference
HasParentDirectory Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.FileTransfer Namespace > IEasyUAFileTransferExtension Class : HasParentDirectory Method
The OPC UA file transfer object that will perform the operation.
Endpoint descriptor. Identifies the OPC-UA server.
The directory node descriptor of the file or directory for which the presence of a parent directory should be tested.
Determines whether the specified OPC UA file or directory has a parent directory object.
Syntax
'Declaration
 
<ExtensionAttribute()>
Public Shared Function HasParentDirectory( _
   ByVal fileTransfer As IEasyUAFileTransfer, _
   ByVal endpointDescriptor As UAEndpointDescriptor, _
   ByVal fileOrDirectoryNodeDescriptor As UANodeDescriptor _
) As Boolean
'Usage
 
Dim fileTransfer As IEasyUAFileTransfer
Dim endpointDescriptor As UAEndpointDescriptor
Dim fileOrDirectoryNodeDescriptor As UANodeDescriptor
Dim value As Boolean
 
value = IEasyUAFileTransferExtension.HasParentDirectory(fileTransfer, endpointDescriptor, fileOrDirectoryNodeDescriptor)

Parameters

fileTransfer
The OPC UA file transfer object that will perform the operation.
endpointDescriptor
Endpoint descriptor. Identifies the OPC-UA server.
fileOrDirectoryNodeDescriptor
The directory node descriptor of the file or directory for which the presence of a parent directory should be tested.

Return Value

Returns true if the file or directory specified by fileOrDirectoryNodeDescriptor has a parent directory. Returns false 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