public DataTable ReadRaw(DateTime startTime, DateTime endTime, int maxValues, bool inclubeBounds)
{
Opc.Hda.Time hdaStartTime = new Time(startTime);
Opc.Hda.Time hdaEndTime = new Time(endTime);
DataTable dataTable = new DataTable("Data");
DataColumn timestamp = new DataColumn("TimeStamp");
DataColumn value = new DataColumn("Value");
DataColumn quality = new DataColumn("Quality");
dataTable.Columns.Add(timestamp);
dataTable.Columns.Add(value);
dataTable.Columns.Add(quality);
Opc.ItemIdentifierCollection itemIdentifierCollection = null;
Opc.ItemIdentifier[] items = null;
int index = 0;
if (_hdaServer.Items.Count != 0)
{
itemIdentifierCollection = _hdaServer.Items;
items = new Opc.ItemIdentifier[itemIdentifierCollection.Count];
}
Opc.Hda.Trend group = new Opc.Hda.Trend(_hdaServer);
foreach (Opc.ItemIdentifier itemIdentifier in itemIdentifierCollection)
{
items[index] = itemIdentifier;
Opc.IdentifiedResult[] results = group.Server.ValidateItems(new Opc.ItemIdentifier[] { itemIdentifier });
group.AddItem(itemIdentifier);
index++;
}
group.Name = String.Format("{0}-{1}", group.Server.Url.HostName, Guid.NewGuid().ToString());
group.EndTime = new Opc.Hda.Time(endTime);
group.StartTime = new Opc.Hda.Time(startTime);
TimeSpan span = endTime.Subtract(startTime);
int calcinterval = ((int)span.TotalSeconds);
group.ResampleInterval = (decimal)calcinterval;
group.AggregateID = Opc.Hda.AggregateID.DURATIONGOOD;
group.MaxValues = maxValues;
ItemValueCollection[] values = group.ReadRaw();
foreach (ItemValueCollection itemValueCollection in values)
{
foreach (ItemValue itemValue in itemValueCollection)
{
DataRow dataRow = dataTable.NewRow();
dataRow["Timestamp"] = itemValue.Timestamp;
dataRow["Value"] = itemValue.Value;
dataRow["Quality"] = itemValue.Quality;
dataTable.Rows.Add(dataRow);
}
}
return dataTable;
}