I made a test program (altered this code) to browse into nodes from my opc ua server (siemens s7-1200):
using (var session = Session.Create(config, new ConfiguredEndpoint(null, selectedEndpoint, EndpointConfiguration.Create(config)), false, "", 60000, null, null).GetAwaiter().GetResult())
{
Console.WriteLine("Step 3 - Browse the server namespace.");
ReferenceDescriptionCollection refs;
byte[] bts;
session.Browse(null, null, ObjectIds.ObjectsFolder, 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out bts, out refs);
Console.WriteLine("DisplayName: BrowseName, NodeClass");
foreach (var rd in refs.Where(r => r.DisplayName == "ServerInterfaces"))
{
Console.WriteLine("{0}: {1}, {2}", rd.DisplayName, rd.BrowseName, rd.NodeClass);
ReferenceDescriptionCollection refs2;
byte[] bts2;
session.Browse(null, null, ExpandedNodeId.ToNodeId(rd.NodeId, session.NamespaceUris), 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out bts2, out refs2);
foreach (var nextRd in refs2)
{
ReferenceDescriptionCollection refs3;
byte[] bts3;
Console.WriteLine("NameSpace+ {0}: {1}, {2}", nextRd.DisplayName, nextRd.BrowseName, nextRd.NodeClass);
session.Browse(null, null, ExpandedNodeId.ToNodeId(nextRd.NodeId, session.NamespaceUris), 0u, BrowseDirection.Forward, ReferenceTypeIds.HierarchicalReferences, true, (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method, out bts3, out refs3);
foreach (var nextRd2 in refs3.Where(n => n.DisplayName != "Icon"))
{
NodeId nodeId = new NodeId(nextRd2.NodeId.ToString());
var value = session.ReadValue(nodeId);
Console.WriteLine("Node+ {0}: {1}, {2}, NodeId = {3}, Value = {4}", nextRd2.DisplayName, nextRd2.BrowseName, nextRd2.NodeClass, nextRd2.NodeId, value);
}
}
}
The problem I am facing is arrays. I have an array of INTs in my OPC ua server. Currently this is what the console displays:
ServerInterfaces: 3:ServerInterfaces, Object
NameSpace+ Server interface_1: 4:Server interface_1, Object
Node+ read: 4:read, Variable, NodeId = ns=4;i=2, Value = (null)
Node+ IntValue1: 4:IntValue1, Variable, NodeId = ns=4;i=7, Value = 100
This is my expected output:
ServerInterfaces: 3:ServerInterfaces, Object
NameSpace+ Server interface_1: 4:Server interface_1, Object
Node+ read: 4:read, Variable, NodeId = ns=4;i=2, Value = (null)
Node+ read: 4:read[0], Variable, NodeId = ns=4;i=3, Value = 1
Node+ read: 4:read[1], Variable, NodeId = ns=4;i=4, Value = 1
Node+ read: 4:read[2], Variable, NodeId = ns=4;i=5, Value = 1
Node+ read: 4:read[3], Variable, NodeId = ns=4;i=6, Value = 1
Node+ IntValue1: 4:IntValue1, Variable, NodeId = ns=4;i=7, Value = 100
How to alter this code (or new code) to get the expected output?
I made another program to get every node. The weird thing is I can get an array from some automaticaly generated content:
ServerProfileArray: System.String[]
[0] Variable = http://opcfoundation.org/UA-Profile/Server/StandardUA
[1] Variable = http://opcfoundation.org/UA-Profile/Server/Methods
[2] Variable = http://opcfoundation.org/UA-Profile/Server/StandardEventSubscription
[3] Variable = http://opcfoundation.org/UA-Profile/Server/DataAccess
But when I goes by my "read" it still doesn't display the array items:
read
read:
I figured it out sort off so better answer are still appreciated (:
Using: var references = session.FetchReferences(nodeId);
You can get all references from a node. You will also get more info that you might not need but you can filter that out later.
foreach (var ref3 in refs3.Where(n => n.DisplayName != "Icon"))
{
NodeId nodeId = new NodeId(ref3.NodeId.ToString());
var value = session.ReadValue(nodeId);
Console.WriteLine("----------------------");
Console.WriteLine("Node+ {0}: {1}, {2}, NodeId = {3}, Value = {4}", ref3.DisplayName, ref3.BrowseName, ref3.NodeClass, ref3.NodeId, value);
var references = session.FetchReferences(nodeId);
if (references != null)
{
Console.WriteLine("array");
foreach (var reference in references.Where(r => r.NodeClass.ToString() == "Variable"))
{
Console.WriteLine(reference.BrowseName + " NodeId: " + reference.NodeId.ToString());
}
}
Console.WriteLine("----------------------");
}
Output:
Node+ read: 4:read, Variable, NodeId = ns=4;i=2, Value = (null)
array
4:[0] NodeId: ns=4;i=3
4:[1] NodeId: ns=4;i=4
4:[2] NodeId: ns=4;i=5
4:[3] NodeId: ns=4;i=6
Edit: Made something better.
When you input a nodeId you get the HierarchicalReferences beneath it, when you input a nodeId (from the array) and put array on true you get the arrayitems beneath it.
public ReferenceDescriptionCollection BrowseNode(string nodeId, bool array = false)
{
NodeId expandedNodeId = ExpandedNodeId.ToNodeId(nodeId, Session.NamespaceUris);
NodeClass nodeClass = array ? NodeClass.Variable : (NodeClass.Variable | NodeClass.Object | NodeClass.Method);
NodeId referenceType = array ? ReferenceTypeIds.HasComponent : ReferenceTypeIds.HierarchicalReferences;
Session.Browse(
null,
null,
expandedNodeId,
0u,
BrowseDirection.Forward,
referenceType,
true,
(uint)nodeClass,
out _,
out ReferenceDescriptionCollection references
);
if (array && references.Count == 0)
{
return null;
}
return references;
}