
OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.ComTypes Namespace : _EasyUAClient Interface |
[CLSCompliant(false)] [ComVisible(true)] [Guid("910344C0-F2A0-42D2-A65E-F3800437F52A")] [InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface _EasyUAClient
[CLSCompliant(false)] [ComVisible(true)] [Guid("910344C0-F2A0-42D2-A65E-F3800437F52A")] [InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface class _EasyUAClient
'Declaration
<CLSCompliantAttribute(False)> <ComVisibleAttribute(True)> <GuidAttribute("910344C0-F2A0-42D2-A65E-F3800437F52A")> <InterfaceTypeAttribute(ComInterfaceType.InterfaceIsDual)> Public Interface _EasyUAClient
'Usage
Dim instance As _EasyUAClient
// This example shows how to read value of a single node, and display it. #include "stdafx.h" // Includes "QuickOpc.h", and other commonly used files #include "ReadValue.h" namespace _EasyUAClient { void ReadValue::Main() { // Initialize the COM library CoInitializeEx(NULL, COINIT_MULTITHREADED); { // Instantiate the client object _EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient)); // Perform the operation _variant_t value = ClientPtr->ReadValue( //L"http://opcua.demo-this.com:51211/UA/SampleServer", L"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", L"nsu=http://test.org/UA/Data/ ;i=10853"); // Display results _variant_t vString; vString.ChangeType(VT_BSTR, &value); _tprintf(_T("value: %s\n"), (LPCTSTR)CW2CT((_bstr_t)vString)); } // Release all interface pointers BEFORE calling CoUninitialize() CoUninitialize(); } }
// This example shows how to read value of a single node, and display it. var Client = new ActiveXObject("OpcLabs.EasyOpc.UA.EasyUAClient"); var value = Client.ReadValue( //"http://opcua.demo-this.com:51211/UA/SampleServer", "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853"); WScript.Echo("value: " + value);
// This example shows how to read value of a single node, and display it. class procedure ReadValue.Main; var Client: EasyUAClient; Value: OleVariant; begin // Instantiate the client object Client := CoEasyUAClient.Create; Value := Client.ReadValue( //'http://opcua.demo-this.com:51211/UA/SampleServer', 'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853'); WriteLn('value: ', Value); end;
// This example shows how to read value of a single node, and display it. class procedure ReadValue.Main; var Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient; Value: OleVariant; begin // Instantiate the client object Client := CoEasyUAClient.Create; // Obtain value of a node try Value := Client.ReadValue( //'http://opcua.demo-this.com:51211/UA/SampleServer', //'https://opcua.demo-this.com:51212/UA/SampleServer/', 'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853'); except on E: EOleException do begin WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message])); Exit; end; end; // Display results WriteLn('value: ', Value); end;
// This example shows how to read value of a single node, and display it. // Instantiate the client object $Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient"); // Perform the operation try { $value = $Client->ReadValue( //"http://opcua.demo-this.com:51211/UA/SampleServer", "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853"); } catch (com_exception $e) { printf("*** Failure: %s\n", $e->getMessage()); Exit(); } // Display results printf("Value: %s\n", $value);
<!-- This example shows how to read value of a single node, and display it. --> <html> <body> <?php // Instantiate the client object $Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient"); // Perform the operation $value = $Client->ReadValue( //"http://opcua.demo-this.com:51211/UA/SampleServer", "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853"); // Display results // Read item value and display it printf("Value: %s<br>", $value); ?> </body> </html>
# This example shows how to read value of a single node, and display it. # The Python for Windows (pywin32) extensions package is needed. Install it using "pip install pypiwin32". # CAUTION: We now recommend using Python.NET package instead. Full set of examples with Python.NET is available! import win32com.client from pywintypes import com_error # Instantiate the client object client = win32com.client.Dispatch('OpcLabs.EasyOpc.UA.EasyUAClient') # Perform the operation try: value = client.ReadValue('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853') except com_error as e: print('*** Failure: ' + e.args[2][1] + ': ' + e.args[2][2]) exit() # Display results print('value: ', value)
Rem This example shows how to read value of a single node, and display it. Public Sub ReadValue_Main_Command_Click() OutputText = "" ' Instantiate the client object Dim Client As New EasyUAClient ' Perform the operation On Error Resume Next Dim value As Variant value = Client.ReadValue("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853") If Err.Number <> 0 Then OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf Exit Sub End If On Error GoTo 0 ' Display results OutputText = OutputText & "value: " & value & vbCrLf End Sub
Rem This example shows how to read value of a single node, and display it. Option Explicit ' Instantiate the client object Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.UA.EasyUAClient") ' Perform the operation On Error Resume Next Dim value: value = Client.ReadValue("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853") If Err.Number <> 0 Then WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description WScript.Quit End If On Error Goto 0 ' Display results WScript.Echo "value: " & value
Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows
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