// Shows how to create and delete OPC UA directories, using the file provider model.
using System;
using OpcLabs.BaseLib.Extensions.FileProviders;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.Extensions;
using OpcLabs.EasyOpc.UA.FileTransfer;
namespace UADocExamples.FileProviders._WritableDirectoryContents
{
class CreateAndDelete
{
public static void Main1()
{
// Unified Automation .NET based demo server (UaNETServer/UaServerNET.exe)
var endpointDescriptor = new UAEndpointDescriptor("opc.tcp://localhost:48030")
.WithUserNameIdentity("john", "master");
// A node that represents an OPC UA file system (a root directory).
UANodeDescriptor fileSystemNodeDescriptor = "nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.FileSystem";
// Create a random number generator - will be used for file/directory names.
var random = new Random();
// Instantiate the file transfer client object
var fileTransferClient = new EasyUAFileTransferClient();
Console.WriteLine("Getting writable file provider...");
IWritableFileProvider writableFileProvider =
fileTransferClient.GetWritableFileProvider(endpointDescriptor, fileSystemNodeDescriptor);
// From this point onwards, the code is independent of the concrete realization of the file provider, and would
// be identical e.g. for files in the physical file system, if the corresponding file provider was used.
// Create two directories, and one nested directory, and delete the first one.
try
{
string directoryName1 = "MyDirectory1-" + random.Next();
Console.WriteLine($"Creating first directory, '{directoryName1}'...");
IWritableDirectoryContents writableDirectoryContents1 = writableFileProvider.GetWritableDirectoryContents(directoryName1);
writableDirectoryContents1.Create();
string directoryName2 = "MyDirectory2-" + random.Next();
Console.WriteLine($"Creating second directory, '{directoryName2}'...");
IWritableDirectoryContents writableDirectoryContents2 = writableFileProvider.GetWritableDirectoryContents(directoryName2);
writableDirectoryContents2.Create();
string nestedDirectoryName = "MyDirectory3-" + random.Next();
Console.WriteLine($"Creating nested directory, '{nestedDirectoryName}'...");
writableDirectoryContents2.CreateSubdirectory(nestedDirectoryName);
// At this moment, the directory structure we have created looks like this:
// * MyDirectory1
// * MyDirectory2
// * * MyDirectory3
Console.WriteLine("Deleting the first directory...");
writableDirectoryContents1.Delete();
}
// Methods in the file provider model throw IOException and other exceptions, but not UAException.
catch (Exception exception)
{
Console.WriteLine($"*** Failure: {exception.GetBaseException().Message}");
return;
}
Console.WriteLine("Finished...");
}
}
}
# Shows how to create and delete OPC UA directories, using the file provider model.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
import random
# Import .NET namespaces.
from System import *
from OpcLabs.BaseLib.Extensions.FileProviders import *
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.Extensions import *
from OpcLabs.EasyOpc.UA.FileTransfer import *
# Unified Automation .NET based demo server (UaNETServer/UaServerNET.exe).
endpointDescriptor = UAEndpointDescriptor('opc.tcp://localhost:48030')
endpointDescriptor = UAEndpointDescriptorExtension.WithUserNameIdentity(endpointDescriptor,'john', 'master')
# A node that represents an OPC UA file system (a root directory).
fileSystemNodeDescriptor = UANodeDescriptor('nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.FileSystem')
# Create a random number generator - will be used for file/directory names.
random = random.Random()
# Instantiate the file transfer client object.
fileTransferClient = EasyUAFileTransferClient()
# Prevent prompt to trust the server certificate (INSECURE, used just for smooth example flow).
EasyUAClient.SharedParameters.EngineParameters.CertificateAcceptancePolicy.TrustEndpointUrlString(
endpointDescriptor.UrlString)
print('Getting writable file provider...')
writableFileProvider = IEasyUAFileTransferExtension.GetWritableFileProvider(fileTransferClient,
endpointDescriptor,
fileSystemNodeDescriptor)
# From this point onwards, the code is independent of the concrete realization of the file provider, and would
# be identical e.g. for files in the physical file system, if the corresponding file provider was used.
# Create two directories, and one nested directory, and delete the first one.
try:
directoryName1 = 'MyDirectory1-' + str(random.randint(0, 999_999_999))
print("Creating first directory, '", directoryName1, "'...", sep='')
writableDirectoryContents1 = writableFileProvider.GetWritableDirectoryContents(directoryName1)
writableDirectoryContents1.Create()
directoryName2 = 'MyDirectory2-' + str(random.randint(0, 999_999_999))
print("Creating second directory, '", directoryName2, "'...", sep='')
writableDirectoryContents2 = writableFileProvider.GetWritableDirectoryContents(directoryName2)
writableDirectoryContents2.Create()
nestedDirectoryName = 'MyDirectory3-' + str(random.randint(0, 999_999_999))
print("Creating nested directory, '", nestedDirectoryName, "'...", sep='')
IWritableDirectoryContentsExtension.CreateSubdirectory(writableDirectoryContents2, nestedDirectoryName)
# At this moment, the directory structure we have created looks like this:
# * MyDirectory1
# * MyDirectory2
# * * MyDirectory3
print('Deleting the first directory...')
IWritableDirectoryContentsExtension.Delete(writableDirectoryContents1)
# Methods in the file provider model throw IOException and other exceptions, but not UAException.
except Exception as exception:
print('*** Failure: ' + exception.GetBaseException().Message)
exit()
print()
print('Finished.')
' Shows how to create and delete OPC UA directories, using the file provider model.
Imports OpcLabs.BaseLib.Extensions.FileProviders
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.Extensions
Imports OpcLabs.EasyOpc.UA.FileTransfer
Namespace FileProviders._WritableDirectoryContents
Friend Class CreateAndDelete
Public Shared Sub Main1()
' Unified Automation .NET based demo server (UaNETServer/UaServerNET.exe)
Dim endpointDescriptor As UAEndpointDescriptor =
New UAEndpointDescriptor("opc.tcp://localhost:48030") _
.WithUserNameIdentity("john", "master")
' A node that represents an OPC UA file system (a root directory).
Dim fileSystemNodeDescriptor As UANodeDescriptor =
"nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.FileSystem"
' Create a random number generator - will be used for file/directory names.
Dim random = New Random
' Instantiate the file transfer client object
Dim fileTransferClient = New EasyUAFileTransferClient
Console.WriteLine("Getting writable file provider...")
Dim writableFileProvider As IWritableFileProvider =
fileTransferClient.GetWritableFileProvider(endpointDescriptor, fileSystemNodeDescriptor)
' From this point onwards, the code is independent of the concrete realization of the file provider, and would
' be identical e.g. for files in the physical file system, if the corresponding file provider was used.
' Create two directories, and one nested directory, and delete the first one.
Try
Dim directoryName1 As String = "MyDirectory1-" & random.Next()
Console.WriteLine($"Creating first directory, '{directoryName1}'...")
Dim writableDirectoryContents1 As IWritableDirectoryContents = writableFileProvider.GetWritableDirectoryContents(directoryName1)
writableDirectoryContents1.Create()
Dim directoryName2 As String = "directoryName2-" & random.Next()
Console.WriteLine($"Creating second directory, '{directoryName2}'...")
Dim writableDirectoryContents2 As IWritableDirectoryContents = writableFileProvider.GetWritableDirectoryContents(directoryName2)
writableDirectoryContents2.Create()
Dim nestedDirectoryName As String = "MyDirectory3-" & random.Next()
Console.WriteLine($"Creating nested directory, '{nestedDirectoryName}'...")
writableDirectoryContents2.CreateSubdirectory(nestedDirectoryName)
' At this moment, the directory structure we have created looks Like this
' * MyDirectory1
' * MyDirectory2
' * * MyDirectory3
Console.WriteLine("Deleting the first directory...")
writableDirectoryContents1.Delete()
' Methods in the file provider model throw IOException and other exceptions, but not UAException.
Catch exception As Exception
Console.WriteLine("*** Failure: {0}", exception.GetBaseException.Message)
Exit Sub
End Try
Console.WriteLine("Finished...")
End Sub
End Class
End Namespace
