/// <summary>
/// Recursively collects the variables in a NodeState and returns a collection of BrowsePaths.
/// </summary>
public void GetBrowsePathFromNodeState(
ISystemContext context,
NodeId rootId,
NodeState parent,
RelativePath parentPath,
BrowsePathCollection browsePaths)
{
List<BaseInstanceState> children = new List<BaseInstanceState>();
parent.GetChildren(context, children);
for (int ii = 0; ii < children.Count; ii++)
{
BaseInstanceState child = children[ii];
BrowsePath browsePath = new BrowsePath();
browsePath.StartingNode = rootId;
browsePath.Handle = child;
if (parentPath != null)
{
browsePath.RelativePath.Elements.AddRange(parentPath.Elements);
}
RelativePathElement element = new RelativePathElement();
element.ReferenceTypeId = child.ReferenceTypeId;
element.IsInverse = false;
element.IncludeSubtypes = false;
element.TargetName = child.BrowseName;
browsePath.RelativePath.Elements.Add(element);
if (child.NodeClass == NodeClass.Variable)
{
browsePaths.Add(browsePath);
}
GetBrowsePathFromNodeState(context, rootId, child, browsePath.RelativePath, browsePaths);
}
}
/// <summary>
/// Returns the node ids for a set of relative paths.
/// </summary>
/// <param name="session">An open session with the server to use.</param>
/// <param name="startNodeId">The starting node for the relative paths.</param>
/// <param name="relativePaths">The relative paths.</param>
/// <returns>A collection of local nodes.</returns>
static List<NodeOfInterest> GetNodeIds(
Session session,
NodeId startNodeId,
params string[] relativePaths)
{
// build the list of browse paths to follow by parsing the relative paths.
BrowsePathCollection browsePaths = new BrowsePathCollection();
if (relativePaths != null)
{
for (int ii = 0; ii < relativePaths.Length; ii++)
{
BrowsePath browsePath = new BrowsePath();
// The relative paths used indexes in the namespacesUris table. These must be
// converted to indexes used by the server. An error occurs if the relative path
// refers to a namespaceUri that the server does not recognize.
// The relative paths may refer to ReferenceType by their BrowseName. The TypeTree object
// allows the parser to look up the server's NodeId for the ReferenceType.
browsePath.RelativePath = RelativePath.Parse(
relativePaths[ii],
session.TypeTree,
session.NamespaceUris,
session.NamespaceUris);
browsePath.StartingNode = startNodeId;
browsePaths.Add(browsePath);
}
}
// make the call to the server.
BrowsePathResultCollection results;
DiagnosticInfoCollection diagnosticInfos;
ResponseHeader responseHeader = session.TranslateBrowsePathsToNodeIds(
null,
browsePaths,
out results,
out diagnosticInfos);
// ensure that the server returned valid results.
Session.ValidateResponse(results, browsePaths);
Session.ValidateDiagnosticInfos(diagnosticInfos, browsePaths);
Console.WriteLine("Translated {0} browse paths.", relativePaths.Length);
// collect the list of node ids found.
List<NodeOfInterest> nodes = new List<NodeOfInterest>();
for (int ii = 0; ii < results.Count; ii++)
{
// check if the start node actually exists.
if (StatusCode.IsBad(results[ii].StatusCode))
{
ServiceResult error = new ServiceResult(
results[ii].StatusCode,
diagnosticInfos[ii],
responseHeader.StringTable);
Console.WriteLine("Path '{0}' is not valid. Error = {1}", relativePaths[ii], error);
continue;
}
// an empty list is returned if no node was found.
if (results[ii].Targets.Count == 0)
{
Console.WriteLine("Path '{0}' does not exist.", relativePaths[ii]);
continue;
}
// Multiple matches are possible, however, the node that matches the type model is the
// one we are interested in here. The rest can be ignored.
BrowsePathTarget target = results[ii].Targets[0];
if (target.RemainingPathIndex != UInt32.MaxValue)
{
Console.WriteLine("Path '{0}' refers to a node in another server.", relativePaths[ii]);
continue;
}
// The targetId is an ExpandedNodeId because it could be node in another server.
// The ToNodeId function is used to convert a local NodeId stored in a ExpandedNodeId to a NodeId.
NodeOfInterest node = new NodeOfInterest();
node.NodeId = ExpandedNodeId.ToNodeId(target.TargetId, session.NamespaceUris);
nodes.Add(node);
}
Console.WriteLine("Translate found {0} local nodes.", nodes.Count);
// return whatever was found.
return nodes;
}
/// <summary>
/// Updates the list of references.
/// </summary>
private void UpdateArguments(Session session, NodeId nodeId)
{
ArgumentsLV.Items.Clear();
// need to fetch the node ids for the argument properties.
BrowsePathCollection browsePaths = new BrowsePathCollection();
foreach (string browseName in new string[] { BrowseNames.InputArguments, BrowseNames.OutputArguments })
{
BrowsePath browsePath = new BrowsePath();
browsePath.StartingNode = nodeId;
browsePath.Handle = browseName;
RelativePathElement element = new RelativePathElement();
element.ReferenceTypeId = ReferenceTypeIds.HasProperty;
element.IsInverse = false;
element.IncludeSubtypes = true;
element.TargetName = browseName;
browsePath.RelativePath.Elements.Add(element);
browsePaths.Add(browsePath);
}
// translate property names.
BrowsePathResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.TranslateBrowsePathsToNodeIds(
null,
browsePaths,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, browsePaths);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, browsePaths);
// create a list of values to read.
ReadValueIdCollection valuesToRead = new ReadValueIdCollection();
for (int ii = 0; ii < results.Count; ii++)
{
if (StatusCode.IsBad(results[ii].StatusCode) || results[ii].Targets.Count <= 0)
{
continue;
}
ReadValueId valueToRead = new ReadValueId();
valueToRead.NodeId = (NodeId)results[ii].Targets[0].TargetId;
valueToRead.AttributeId = Attributes.Value;
valueToRead.Handle = browsePaths[ii].Handle;
valuesToRead.Add(valueToRead);
}
// read the values.
if (valuesToRead.Count > 0)
{
DataValueCollection values = null;
session.Read(
null,
0,
TimestampsToReturn.Neither,
valuesToRead,
out values,
out diagnosticInfos);
ClientBase.ValidateResponse(results, valuesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, valuesToRead);
// update the list control.
for (int ii = 0; ii < values.Count; ii++)
{
// all structures are wrapped in extension objects.
ExtensionObject[] extensions = values[ii].GetValue<ExtensionObject[]>(null);
if (extensions != null)
{
// convert to an argument structure.
Argument[] arguments = (Argument[])ExtensionObject.ToArray(extensions, typeof(Argument));
UpdateList(session, arguments, (string)valuesToRead[ii].Handle);
}
}
}
// auto size the columns.
for (int ii = 0; ii < ArgumentsLV.Columns.Count; ii++)
{
ArgumentsLV.Columns[ii].Width = -2;
}
}