|
public static Browse ( |
||
| session | The session. | |
| nodeToBrowse | BrowseDescription | The NodeId for the starting node. |
| throwOnError | bool | if set to |
| return | ReferenceDescriptionCollection | |
public static ReferenceDescriptionCollection Browse(Session session, BrowseDescription nodeToBrowse, bool throwOnError)
{
try
{
ReferenceDescriptionCollection references = new ReferenceDescriptionCollection();
// construct browse request.
BrowseDescriptionCollection nodesToBrowse = new BrowseDescriptionCollection();
nodesToBrowse.Add(nodeToBrowse);
// start the browse operation.
BrowseResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
session.Browse(
null,
null,
0,
nodesToBrowse,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, nodesToBrowse);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToBrowse);
do
{
// check for error.
if (StatusCode.IsBad(results[0].StatusCode))
{
throw new ServiceResultException(results[0].StatusCode);
}
// process results.
for (int ii = 0; ii < results[0].References.Count; ii++)
{
references.Add(results[0].References[ii]);
}
// check if all references have been fetched.
if (results[0].References.Count == 0 || results[0].ContinuationPoint == null)
{
break;
}
// continue browse operation.
ByteStringCollection continuationPoints = new ByteStringCollection();
continuationPoints.Add(results[0].ContinuationPoint);
session.BrowseNext(
null,
false,
continuationPoints,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, continuationPoints);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, continuationPoints);
}
while (true);
//return complete list.
return references;
}
catch (Exception exception)
{
if (throwOnError)
{
throw new ServiceResultException(exception, StatusCodes.BadUnexpectedError);
}
return null;
}
}
|
ComAeUtils::Browse ( |
/// <summary>
/// Fetches the children from the server.
/// </summary>
private List <AeBrowseElement> Browse(Session session, AeBrowseElement start, bool isArea)
{
// browse for notifiers and sources.
BrowseDescription nodeToBrowse = new BrowseDescription();
nodeToBrowse.NodeId = start.NodeId;
nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
nodeToBrowse.ResultMask = (uint)(BrowseResultMask.BrowseName);
nodeToBrowse.NodeClassMask = (uint)0;
if (isArea)
{
nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasNotifier;
nodeToBrowse.IncludeSubtypes = true;
}
else
{
nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HasEventSource;
nodeToBrowse.IncludeSubtypes = true;
}
ReferenceDescriptionCollection references = ComAeUtils.Browse(
session,
nodeToBrowse,
false);
if (references == null)
{
throw ComUtils.CreateComException(ResultIds.E_FAIL);
}
List <AeBrowseElement> hits = new List <AeBrowseElement>();
for (int ii = 0; ii < references.Count; ii++)
{
// ignore remote references.
if (references[ii].NodeId.IsAbsolute)
{
continue;
}
// need to check if at the end of the tree.
if (references[ii].ReferenceTypeId != ReferenceTypeIds.HasEventSource)
{
nodeToBrowse.NodeId = (NodeId)references[ii].NodeId;
ReferenceDescriptionCollection children = ComAeUtils.Browse(session, nodeToBrowse, false);
if (!isArea)
{
if (children != null && children.Count > 0)
{
continue;
}
}
else
{
if (children == null || children.Count == 0)
{
continue;
}
}
}
string browseText = m_mapper.GetLocalBrowseName(references[ii].BrowseName);
// check for duplicate browse names.
for (int jj = 0; jj < hits.Count; jj++)
{
if (hits[jj].BrowseText == browseText)
{
hits[jj].Duplicated = true;
browseText = null;
break;
}
}
// add new element.
if (browseText != null)
{
AeBrowseElement element = new AeBrowseElement();
element.Parent = start;
element.NodeId = (NodeId)references[ii].NodeId;
element.BrowseText = m_mapper.GetLocalBrowseName(references[ii].BrowseName);
element.IsArea = isArea;
hits.Add(element);
StringBuilder itemId = new StringBuilder();
itemId.Append(start.ItemId);
itemId.Append('/');
itemId.Append(element.BrowseText);
element.ItemId = itemId.ToString();
}
}
// remove any duplicates.
for (int ii = 0; ii < hits.Count;)
{
if (hits[ii].Duplicated)
{
hits.RemoveAt(ii);
continue;
}
ii++;
}
return(hits);
}
