// Shows how to write data into a section of an OPC UA file, using the file transfer client.
// Note: Consider using a higher-level abstraction, OPC UA file provider, instead.
using System;
using System.Text;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.FileTransfer;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples.FileTransfer._EasyUAFileTransferClient
{
class WriteFile
{
public static void Main1()
{
// Unified Automation .NET based demo server (UaNETServer/UaServerNET.exe)
UAEndpointDescriptor endpointDescriptor = "opc.tcp://localhost:48030";
// A node that represents an instance of OPC UA FileType object.
UANodeDescriptor fileNodeDescriptor = "nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.TextFile";
// Instantiate the file transfer client object
var fileTransferClient = new EasyUAFileTransferClient();
// Open the file, write a section of it, and close it.
try
{
Console.WriteLine("Opening file...");
using (UAFileHandle fileHandle = fileTransferClient.OpenFile(endpointDescriptor, fileNodeDescriptor,
UAOpenFileModes.Read | UAOpenFileModes.Write))
{
Console.WriteLine("Writing file section...");
byte[] data = Encoding.UTF8.GetBytes("TEXT FROM FILE TRANSFER CLIENT EXAMPLE. Demonstrates writing a section of a file. <<<");
fileTransferClient.WriteFile(endpointDescriptor, fileNodeDescriptor, fileHandle, data);
Console.WriteLine("Closing file...");
fileTransferClient.CloseFile(endpointDescriptor, fileNodeDescriptor, fileHandle);
}
}
catch (UAException uaException)
{
Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
return;
}
Console.WriteLine();
Console.WriteLine("Finished...");
}
}
}
# Shows how to write data into a section of an OPC UA file, using the file transfer client.
# Note: Consider using a higher-level abstraction, OPC UA file provider, instead.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc
# Import .NET namespaces.
from System import *
from System.Text import *
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.Extensions import *
from OpcLabs.EasyOpc.UA.FileTransfer import *
from OpcLabs.EasyOpc.UA.OperationModel 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 instance of OPC UA FileType object.
fileNodeDescriptor = UANodeDescriptor('nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.TextFile')
# 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)
# Open the file, write a section of it, and close it.
fileHandle = None
try:
print('Opening file...')
fileHandle = fileTransferClient.OpenFile(endpointDescriptor, fileNodeDescriptor,
UAOpenFileModes.Read | UAOpenFileModes.Write)
print('Writing file section...')
data = Encoding.UTF8.GetBytes('TEXT FROM FILE TRANSFER CLIENT EXAMPLE. Demonstrates writing a section of a file. '
'<<<')
fileTransferClient.WriteFile(endpointDescriptor, fileNodeDescriptor, fileHandle, data)
print('Closing file...')
fileTransferClient.CloseFile(endpointDescriptor, fileNodeDescriptor, fileHandle)
except UAException as uaException:
print('*** Failure: ' + uaException.GetBaseException().Message)
exit()
finally:
fileHandle and fileHandle.Dispose()
print()
print('Finished.')
' Shows how to write data into a section of an OPC UA file, using the file transfer client.
' Note: Consider using a higher-level abstraction, OPC UA file provider, instead.
Imports System.Text
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.FileTransfer
Imports OpcLabs.EasyOpc.UA.OperationModel
Namespace FileTransfer._EasyUAFileTransferClient
Friend Class WriteFile
Public Shared Sub Main1()
' Unified Automation .NET based demo server (UaNETServer/UaServerNET.exe)
Dim endpointDescriptor As UAEndpointDescriptor = "opc.tcp://localhost:48030"
' A node that represents an instance of OPC UA FileType object.
Dim fileNodeDescriptor As UANodeDescriptor = "nsu=http://www.unifiedautomation.com/DemoServer/ ;s=Demo.Files.TextFile"
' Instantiate the file transfer client object
Dim fileTransferClient = New EasyUAFileTransferClient
' Open the file, write a section of it, and close it.
Try
Console.WriteLine("Opening file...")
Using fileHandle As UAFileHandle = fileTransferClient.OpenFile(endpointDescriptor, fileNodeDescriptor,
UAOpenFileModes.Read Or UAOpenFileModes.Write)
Console.WriteLine("Writing file section...")
Dim data As Byte() = Encoding.UTF8.GetBytes("TEXT FROM FILE TRANSFER CLIENT EXAMPLE. Demonstrates writing a section of a file. <<<")
fileTransferClient.WriteFile(endpointDescriptor, fileNodeDescriptor, fileHandle, data)
Console.WriteLine("Closing file...")
fileTransferClient.CloseFile(endpointDescriptor, fileNodeDescriptor, fileHandle)
End Using
Catch uaException As UAException
Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message)
Exit Sub
End Try
Console.WriteLine()
Console.WriteLine("Finished...")
End Sub
End Class
End Namespace
