public List <OpcItemValue> Read(string[] tag)
{
var nodesToRead = BuildReadValueIdCollection(tag, Attributes.Value);
DataValueCollection results;
DiagnosticInfoCollection diag;
_session.Read(
requestHeader: null,
maxAge: 0,
timestampsToReturn: TimestampsToReturn.Neither,
nodesToRead: nodesToRead,
results: out results,
diagnosticInfos: out diag);
List <OpcItemValue> value = new List <OpcItemValue>();
int i = 0;
foreach (DataValue v in results)
{
OpcItemValue oiv = new OpcItemValue {
ItemId = tag[i], Value = v.Value, Quality = v.StatusCode.ToString(), Timestamp = v.SourceTimestamp
};
i++;
value.Add(oiv);
}
return(value);
}
public OpcGroup AddGroup(string groupName)
{
OpcGroup _group = new OpcGroup {
IsActive = true, Name = groupName, UpdateRate = new TimeSpan(0, 0, 0, 0, _options.DefaultMonitorInterval)
};
var subItem = new OpcDa.SubscriptionState
{
Name = (++_sub).ToString(CultureInfo.InvariantCulture),
Active = true,
UpdateRate = DefaultMonitorInterval
};
var sub = _server.CreateSubscription(subItem);
Action unsubscribe = () => new Thread(o =>
_server.CancelSubscription(sub)).Start();
dic.Add(groupName, sub);
sub.DataChanged += (subscriptionHandle, requestHandle, values) =>
{
List <OpcItemValue> items = new List <OpcItemValue>();
foreach (OpcDa.ItemValueResult value in values)
{
OpcItemValue item = new OpcItemValue {
GroupName = groupName, Value = value.Value, ItemId = value.ItemName, Quality = value.Quality.ToString(), Timestamp = value.Timestamp
};
items.Add(item);
}
_group.SendValue(items);
};
return(_group);
}
private void GetChange(object sub)
{
Subscription _sub = ((Subscription)sub);
string groupName = _sub.DisplayName;
OpcGroup _group;
if (_groups.TryGetValue(groupName, out _group))
{
while (true)
{
lock (_datavalue)
{
List <MonitoredItem> _mo = _sub.MonitoredItems.ToList();
List <OpcItemValue> items = new List <OpcItemValue>();
foreach (MonitoredItem mitem in _mo)
{
object value;
List <DataValue> _value = mitem.DequeueValues().ToList();
if (_value.Count > 0)
{
OpcItemValue item = new OpcItemValue {
GroupName = groupName, Value = _value[0].WrappedValue.Value, Timestamp = _value[0].SourceTimestamp.ToLocalTime(), ItemId = mitem.DisplayName, Quality = _value[0].StatusCode.ToString()
};
if (_datavalue.TryGetValue(mitem.DisplayName, out value))
{
if (_value[0].WrappedValue.Value != value)
{
items.Add(item);
_datavalue[mitem.DisplayName] = _value[0].WrappedValue.Value;
}
}
else
{
items.Add(item);
_datavalue.Add(mitem.DisplayName, _value[0].WrappedValue.Value);
}
}
}
if (items.Count > 0)
{
_group.SendValue(items);
}
}
}
}
}
