Browses the Methods, specifying an endpoint descriptor, and a starting Node Id.
Syntax
'Declaration
<JetBrains.Annotations.ItemNotNullAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
Function BrowseMethods( _
ByVal As String, _
ByVal As String _
) As UANodeElementCollection
'Usage
Dim instance As _EasyUAClient
Dim endpointDescriptorString As String
Dim nodeDescriptorString As String
Dim value As UANodeElementCollection
value = instance.BrowseMethods(endpointDescriptorString, nodeDescriptorString)
Parameters
- endpointDescriptorString
- Endpoint descriptor. Identifies the OPC-UA server.
The value represents an OPC UA endpoint descriptor string. Any string can be passed to this parameter (i.e. will not cause System.ArgumentException), but not all values make sense and will work when an operation using them is attempted. The OPC UA endpoint descriptor string is typically the URL of the server endpoint.
The value of this parameter can be null
(Nothing
in Visual Basic).
- nodeDescriptorString
- Node descriptor. Identifies the node in OPC server's address space.
The value of this parameter can be null
(Nothing
in Visual Basic).
Return Value
The method returns a node element collection, which contains
OpcLabs.EasyOpc.UA.AddressSpace.UANodeElement values. Each element contains information about a particular node found.
This method never returns null
(Nothing
in Visual Basic).
The individual elements of the returned value are never null
(Nothing
in Visual Basic).
Example
COM
// This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
// For each node, it displays its browse name and node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// 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.
#include "stdafx.h" // Includes "QuickOpc.h", and other commonly used files
#include "BrowseMethods.h"
namespace _EasyUAClient
{
void BrowseMethods::Main()
{
// Initialize the COM library
CoInitializeEx(NULL, COINIT_MULTITHREADED);
{
// Instantiate the client object
_EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient));
// Perform the operation
_UANodeElementCollectionPtr NodeElementsPtr = ClientPtr->BrowseMethods(
//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=10755");
// Display results
IEnumVARIANTPtr EnumNodeElementPtr = NodeElementsPtr->GetEnumerator();
_variant_t vNodeElement;
while (EnumNodeElementPtr->Next(1, &vNodeElement, NULL) == S_OK)
{
_UANodeElementPtr NodeElementPtr(vNodeElement);
_tprintf(_T("%s: "), (LPCTSTR)CW2CT(NodeElementPtr->BrowseName->ToString));
_tprintf(_T("%s\n"), (LPCTSTR)CW2CT(NodeElementPtr->NodeId->ToString));
vNodeElement.Clear();
}
}
// Release all interface pointers BEFORE calling CoUninitialize()
CoUninitialize();
}
}
// This example shows how to obtain all method nodes under a given node of
// the OPC-UA address space. For each node, it displays its browse name and
// node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// 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.
class procedure BrowseMethods.Main;
var
Client: EasyUAClient;
Count: Cardinal;
Element: OleVariant;
NodeElement: _UANodeElement;
NodeElementEnumerator: IEnumVariant;
NodeElements: _UANodeElementCollection;
begin
// Instantiate the client object
Client := CoEasyUAClient.Create;
NodeElements := Client.BrowseMethods(
//'http://opcua.demo-this.com:51211/UA/SampleServer',
'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer',
'nsu=http://test.org/UA/Data/ ;i=10755');
NodeElementEnumerator := NodeElements.GetEnumerator;
while (NodeElementEnumerator.Next(1, Element, Count) = S_OK) do
begin
NodeElement := IUnknown(Element) as _UANodeElement;
WriteLn(NodeElement.BrowseName.ToString, ': ', NodeElement.NodeId.ToString);
end;
end;
// This example shows how to obtain all method nodes under a given node of
// the OPC-UA address space. For each node, it displays its browse name and
// node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in Object Pascal (Delphi) on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-OP .
// 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.
class procedure BrowseMethods.Main;
var
Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient;
Count: Cardinal;
Element: OleVariant;
NodeElement: _UANodeElement;
NodeElementEnumerator: IEnumVariant;
NodeElements: _UANodeElementCollection;
begin
// Instantiate the client object
Client := CoEasyUAClient.Create;
try
NodeElements := Client.BrowseMethods(
//'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=10755');
except
on E: EOleException do
begin
WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
Exit;
end;
end;
NodeElementEnumerator := NodeElements.GetEnumerator;
while (NodeElementEnumerator.Next(1, Element, Count) = S_OK) do
begin
NodeElement := IUnknown(Element) as _UANodeElement;
WriteLn(NodeElement.BrowseName.ToString, ': ', NodeElement.NodeId.ToString);
end;
// Example output:
// ScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10756
// ScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10759
// ScalarMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10762
// ArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10765
// ArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10768
// ArrayMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10771
// UserScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10774
// UserScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10777
// UserArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10780
// UserArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10783
end;
// This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
// For each node, it displays its browse name and node ID.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in PHP on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PHP .
// 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.
// Instantiate the client object
$Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient");
// Perform the operation
try
{
$NodeElements = $Client->BrowseMethods(
//"http://opcua.demo-this.com:51211/UA/SampleServer",
"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer",
"nsu=http://test.org/UA/Data/ ;i=10755");
}
catch (com_exception $e)
{
printf("*** Failure: %s\n", $e->getMessage());
Exit();
}
// Display results
foreach ($NodeElements as $NodeElement)
{
printf(" s\n", $NodeElement->BrowseName, $NodeElement->NodeId);
}
REM This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
REM For each node, it displays its browse name and node ID.
REM
REM Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
REM OPC client and subscriber examples in Visual Basic on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VB .
REM Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
REM a commercial license in order to use Online Forums, and we reply to every post.
Public Sub BrowseMethods_Main_Command_Click()
OutputText = ""
' Instantiate the client object
Dim Client As New EasyUAClient
' Perform the operation
On Error Resume Next
Dim NodeElements As UANodeElementCollection
Set NodeElements = Client.BrowseMethods("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10755")
If Err.Number <> 0 Then
OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf
Exit Sub
End If
On Error GoTo 0
' Display results
Dim NodeElement: For Each NodeElement In NodeElements
OutputText = OutputText & NodeElement.BrowseName & ": " & NodeElement.NodeId & vbCrLf
Next
End Sub
Rem This example shows how to obtain all method nodes under a given node of the OPC-UA address space.
Rem For each node, it displays its browse name and node ID.
Rem
Rem Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
Rem OPC client and subscriber examples in VBScript on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBScript .
Rem Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
Rem a commercial license in order to use Online Forums, and we reply to every post.
Option Explicit
' Instantiate the client object
Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.UA.EasyUAClient")
' Perform the operation
On Error Resume Next
Dim NodeElements: Set NodeElements = Client.BrowseMethods("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10755")
If Err.Number <> 0 Then
WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description
WScript.Quit
End If
On Error Goto 0
' Display results
Dim NodeElement: For Each NodeElement In NodeElements
WScript.Echo NodeElement.BrowseName & ": " & NodeElement.NodeId
Next
' Example output:
'ScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10756
'ScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10759
'ScalarMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10762
'ArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10765
'ArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10768
'ArrayMethod3: nsu=http://test.org/UA/Data/ ;ns=2;i=10771
'UserScalarMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10774
'UserScalarMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10777
'UserArrayMethod1: nsu=http://test.org/UA/Data/ ;ns=2;i=10780
'UserArrayMethod2: nsu=http://test.org/UA/Data/ ;ns=2;i=10783
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