// This example shows how to browse objects under the "Objects" node and display notifiers.
//
// 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 BrowseNotifiers.Main;
var
ObjectNodeId: _UANodeId;
begin
ObjectNodeId := CoUANodeId.Create;
ObjectNodeId.StandardName := 'Objects';
try
BrowseFrom(ObjectNodeId);
except
on E: EOleException do
begin
WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
Exit;
end;
end;
end;
class procedure BrowseNotifiers.BrowseFrom(NodeId: _UANodeId);
var
Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient;
Count: Cardinal;
Element: OleVariant;
EndpointDescriptor: string;
NotifierNodeElement: _UANodeElement;
NotifierNodeElementEnumerator: IEnumVariant;
NotifierNodeElements: _UANodeElementCollection;
ObjectNodeElement: _UANodeElement;
ObjectNodeElementEnumerator: IEnumVariant;
ObjectNodeElements: _UANodeElementCollection;
begin
EndpointDescriptor := 'opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer';
WriteLn;
WriteLn;
WriteLn('Parent node: ', NodeId.ToString);
// Instantiate the client object
Client := CoEasyUAClient.Create;
// Obtain notifiers
NotifierNodeElements := Client.BrowseNotifiers(EndpointDescriptor, NodeId.ExpandedText);
// Display notifires
if NotifierNodeElements.Count <> 0 then
begin
WriteLn;
WriteLn('Notifiers:');
NotifierNodeElementEnumerator := NotifierNodeElements.GetEnumerator;
while (NotifierNodeElementEnumerator.Next(1, Element, Count) = S_OK) do
begin
NotifierNodeElement := IUnknown(Element) as _UANodeElement;
WriteLn(NotifierNodeElement.ToString);
end;
end;
// Obtain objects
ObjectNodeElements := Client.BrowseObjects(EndpointDescriptor, NodeId.ExpandedText);
// Recurse
ObjectNodeElementEnumerator := ObjectNodeElements.GetEnumerator;
while (ObjectNodeElementEnumerator.Next(1, Element, Count) = S_OK) do
begin
ObjectNodeElement := IUnknown(Element) as _UANodeElement;
BrowseFrom(ObjectNodeElement.NodeId);
end;
end;
// Example output (truncated):
//
//
//Parent node: ObjectsFolder
//
//
//Parent node: Server
//
//Notifiers:
//Green -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Green (Object)
//Yellow -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Yellow (Object)
//
//
//Parent node: Server_ServerCapabilities
//...
// This example shows how to browse objects under the "Objects" node and display notifiers.
//
// 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.
// Start browsing from the "Objects" node
$ObjectNodeId = new COM("OpcLabs.EasyOpc.UA.AddressSpace.UANodeId");
$ObjectNodeId->StandardName = "Objects";
try
{
BrowseFrom($ObjectNodeId);
}
catch (com_exception $e)
{
printf("*** Failure: %s\n", $e->getMessage());
exit();
}
function BrowseFrom($NodeId) {
$EndpointDescriptor = "opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer";
printf("\n");
printf("\n");
printf("Parent node: %s\n", $NodeId);
// Instantiate the client object
$Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient");
// Obtain notifiers
$NotifierNodeElements = $Client->BrowseNotifiers($EndpointDescriptor, $NodeId->ExpandedText);
// Display notifires
if ($NotifierNodeElements->Count != 0) {
printf("\n");
printf("Notifiers:\n");
foreach ($NotifierNodeElements as $NotifierNodeElement)
{
printf("%s\n", $NotifierNodeElement);
}
}
// Obtain objects
$ObjectNodeElements = $Client->BrowseObjects($EndpointDescriptor, $NodeId->ExpandedText);
// Recurse
foreach ($ObjectNodeElements as $ObjectNodeElement)
{
BrowseFrom($ObjectNodeElement->NodeId);
}
}
// Example output (truncated):
//
//
//Parent node: ObjectsFolder
//
//
//Parent node: Server
//
//Notifiers:
//Green -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Green (Object)
//Yellow -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Yellow (Object)
//
//
//Parent node: Server_ServerCapabilities
//...
Rem This example shows how to browse objects under the "Objects" node and display notifiers.
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
' Start browsing from the "Objects" node
Dim ObjectsNodeId: Set ObjectsNodeId = CreateObject("OpcLabs.EasyOpc.UA.AddressSpace.UANodeId")
ObjectsNodeId.StandardName = "Objects"
On Error Resume Next
BrowseFrom ObjectsNodeId
If Err.Number <> 0 Then
WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description
WScript.Quit
End If
On Error Goto 0
Sub BrowseFrom(NodeId)
Dim endpointDescriptor
endpointDescriptor = "opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer"
WScript.Echo
WScript.Echo
WScript.Echo "Parent node: " & NodeId
' Instantiate the client object
Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.UA.EasyUAClient")
' Obtain notifiers
Dim NotifierNodeElementCollection: Set NotifierNodeElementCollection = Client.BrowseNotifiers( _
endpointDescriptor, NodeId.ExpandedText)
' Display notifiers
If NotifierNodeElementCollection.Count <> 0 Then
WScript.Echo
WScript.Echo "Notifiers:"
Dim NotifierNodeElement: For Each NotifierNodeElement In NotifierNodeElementCollection
WScript.Echo NotifierNodeElement
Next
End If
' Obtain objects
Dim ObjectNodeElementCollection: Set ObjectNodeElementCollection = Client.BrowseObjects( _
endpointDescriptor, NodeId.ExpandedText)
' Recurse
Dim ObjectNodeElement: For Each ObjectNodeElement In ObjectNodeElementCollection
BrowseFrom ObjectNodeElement.NodeId
Next
End Sub
' Example output (truncated):
'
'
'Parent node: ObjectsFolder
'
'
'Parent node: Server
'
'Notifiers:
'Green -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Green (Object)
'Yellow -> nsu=http://opcfoundation.org/Quickstarts/AlarmCondition ;ns=2;s=0:/Yellow (Object)
'
'
'Parent node: Server_ServerCapabilities
'...
