public async Task ReadValiesAsynchronously()
{
Uri url = UrlBuilder.Build("Matrikon.OPC.Simulation.1");
using (var server = new OpcDaServer(url))
{
// Connect to the server first.
server.Connect();
// Create a group with items.
OpcDaGroup group = CreateGroupWithItems(server);
// Read values of items from device asynchronously.
OpcDaItemValue[] values = await group.ReadAsync(group.Items);
// Output values
foreach (OpcDaItemValue value in values)
{
Console.WriteLine("ItemId: {0}; Value: {1}; Quality: {2}; Timestamp: {3}",
value.Item.ItemId, value.Value, value.Quality, value.Timestamp);
}
// The output should be like the following:
// ItemId: Bucket Brigade.Int4; Value: 0; Quality: Good+Good+NotLimited; Timestamp: 04/18/2016 13:40:57 +03:00
// ItemId: Random.Int2; Value: 26500; Quality: Good+Good+NotLimited; Timestamp: 04/18/2016 13:40:57 +03:00
values.Should().OnlyContain(v => v.Error.Succeeded);
values.Should().OnlyContain(v => v.Quality.Master == OpcDaQualityMaster.Good);
}
}
public OpcDaItemValue[] readTag(bool _sync = false, Action <OpcDaItemValue[]> _callBack = null)
{
//da excecao caso o argumento callback seja nulo com o comando assyncrono
if ((_sync == false) && (_callBack == null))
{
throw(new ArgumentNullException());
}
// Create a group with items.
readingGroup.SyncItems();
Console.Write("reading group -> ");
Console.WriteLine(readingGroup);
Console.WriteLine("lendo");
//faz leitura das tags
if (_sync)
{
// Read all items of the group synchronously.
var values = readingGroup.Read(readingGroup.Items, OpcDaDataSource.Device);
foreach (var val in values)
{
Console.Write(val.Item.ItemId);
Console.Write(" -- \t");
Console.Write(val.Value);
Console.Write(" -- \t\t\t\t");
Console.Write((int)val.Quality);
Console.Write(" -- \t\t");
Console.Write(val.Timestamp);
Console.Write(" -- \t\t");
Console.WriteLine((int)val.Error);
}
}
else
{
void completed(Task <OpcDaItemValue[]> values)
{/*
* //OpcDaItemValue[] values = group.ReadAsync(group.Items);
* foreach(OpcDaItemValue val in values.Result)
* {
* Console.Write(val.Item.ItemId);
* Console.Write(" -- \t");
* Console.Write(val.Value);
* Console.Write(" -- \t\t\t\t");
* Console.Write((int) val.Quality);
* Console.Write(" -- \t\t");
* Console.Write(val.Timestamp);
* Console.Write(" -- \t\t");
* Console.WriteLine((int) val.Error);
* }
*/
//chama o callback definido na funcao
_callBack((OpcDaItemValue[])values.Result);
}
var readingTask = readingGroup.ReadAsync(readingGroup.Items, this.readingCancelationToken);
Action <Task <OpcDaItemValue[]> > receiverData = completed;
readingTask.ContinueWith(receiverData);
// Read all items of the group asynchronously.
//OpcDaItemValue[] values = group.ReadAsync(group.Items);
//foreach(var val in values)
//{
// Console.WriteLine(val);
//}
}
return(null);
}
