private void EventTypeBTN_Click(object sender, EventArgs e)
{
try
{
if (m_session == null)
{
return;
}
TypeDeclaration type = new SelectTypeDlg().ShowDialog(m_session, Opc.Ua.ObjectTypeIds.BaseEventType, "Select Event Type");
if (type == null)
{
return;
}
m_filter = new FilterDeclaration(type, m_filter);
EventTypeTB.Text = m_session.NodeCache.GetDisplayText(m_filter.EventTypeId);
EventFilterTB.Text = GetFilterFields(m_filter);
ResultsLV.ChangeFilter(m_filter, false);
}
catch (Exception exception)
{
ClientUtils.HandleException(this.Text, exception);
}
}
private void EventAreaBTN_Click(object sender, EventArgs e)
{
try
{
if (m_session == null)
{
return;
}
NodeId areaId = new SelectNodeDlg().ShowDialog(m_session, Opc.Ua.ObjectIds.Server, "Select Event Area", Opc.Ua.ReferenceTypeIds.HasEventSource);
if (areaId == null)
{
return;
}
m_areaId = areaId;
EventAreaTB.Text = m_session.NodeCache.GetDisplayText(m_areaId);
ResultsLV.ChangeArea(areaId, false);
}
catch (Exception exception)
{
ClientUtils.HandleException(this.Text, exception);
}
}
/// <summary>
/// Starts a new read operation.
/// </summary>
private void ReadFirst()
{
ResultsLV.ClearEventHistory();
// set up the request parameters.
ReadEventDetails details = new ReadEventDetails();
details.StartTime = DateTime.MinValue;
details.EndTime = DateTime.MinValue;
details.NumValuesPerNode = 0;
details.Filter = m_filter.GetFilter();
if (StartTimeCK.Checked)
{
details.StartTime = StartTimeDP.Value.ToUniversalTime();
}
if (EndTimeCK.Checked)
{
details.EndTime = EndTimeDP.Value.ToUniversalTime();
}
if (MaxReturnValuesCK.Checked)
{
details.NumValuesPerNode = (uint)MaxReturnValuesNP.Value;
}
// read the events from the server.
HistoryReadValueId nodeToRead = new HistoryReadValueId();
nodeToRead.NodeId = m_areaId;
ReadNext(details, nodeToRead);
}
/// <summary>
/// Continues a read operation.
/// </summary>
private void ReadNext(ReadEventDetails details, HistoryReadValueId nodeToRead)
{
HistoryReadValueIdCollection nodesToRead = new HistoryReadValueIdCollection();
nodesToRead.Add(nodeToRead);
HistoryReadResultCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
ResponseHeader responseHeader = m_session.HistoryRead(
null,
new ExtensionObject(details),
TimestampsToReturn.Neither,
false,
nodesToRead,
out results,
out diagnosticInfos);
Session.ValidateResponse(results, nodesToRead);
Session.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
if (StatusCode.IsBad(results[0].StatusCode))
{
throw ServiceResultException.Create(results[0].StatusCode, 0, diagnosticInfos, responseHeader.StringTable);
}
// display results.
HistoryEvent data = ExtensionObject.ToEncodeable(results[0].HistoryData) as HistoryEvent;
ResultsLV.AddEventHistory(data);
// check if a continuation point exists.
if (results[0].ContinuationPoint != null && results[0].ContinuationPoint.Length > 0)
{
nodeToRead.ContinuationPoint = results[0].ContinuationPoint;
NextBTN.Visible = true;
StopBTN.Enabled = true;
GoBTN.Visible = false;
m_details = details;
m_nodeToRead = nodeToRead;
}
// all done.
else
{
NextBTN.Visible = false;
StopBTN.Enabled = false;
GoBTN.Visible = true;
m_details = null;
m_nodeToRead = null;
}
}
/// <summary>
/// Displays the dialog.
/// </summary>
public bool ShowDialog(Session session, NodeId areaId, FilterDeclaration filter)
{
m_session = session;
m_areaId = areaId;
m_filter = filter;
EventAreaTB.Text = session.NodeCache.GetDisplayText(m_areaId);
EventTypeTB.Text = session.NodeCache.GetDisplayText(filter.EventTypeId);
EventFilterTB.Text = GetFilterFields(m_filter);
ResultsLV.IsSubscribed = false;
ResultsLV.ChangeSession(session, false);
ResultsLV.ChangeArea(areaId, false);
ResultsLV.ChangeFilter(filter, false);
// get the beginning of data.
DateTime startTime;
try
{
startTime = ReadFirstDate().ToLocalTime();
}
catch (Exception)
{
startTime = new DateTime(2000, 1, 1);
}
StartTimeDP.Value = startTime;
StartTimeCK.Checked = true;
EndTimeDP.Value = DateTime.Now;
EndTimeCK.Checked = true;
MaxReturnValuesNP.Value = 10;
MaxReturnValuesCK.Checked = true;
GoBTN.Visible = true;
NextBTN.Visible = false;
StopBTN.Enabled = false;
if (ShowDialog() != DialogResult.OK)
{
return(false);
}
return(true);
}
private void EventFilterBTN_Click(object sender, EventArgs e)
{
try
{
if (m_session == null)
{
return;
}
if (!new ModifyFilterDlg().ShowDialog(m_filter))
{
return;
}
EventFilterTB.Text = GetFilterFields(m_filter);
ResultsLV.ChangeFilter(m_filter, false);
}
catch (Exception exception)
{
ClientUtils.HandleException(this.Text, exception);
}
}