The example below shows how to create and delete OPC UA directories, using the file provider model.
// Shows how to create and delete OPC UA directories, using the file provider model. // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. 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. ' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . ' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. 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
# Shows how to create and delete OPC UA directories, using the file provider model. # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . # OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python . # Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own # a commercial license in order to use Online Forums, and we reply to every post. # 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.')
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