/// <summary>
/// Stops the read.
/// </summary>
public void Stop()
{
if (IsReading && CurReadWaitResult != null && !CurReadWaitResult.IsCompleted &&
(CounterReader != null || AnalogReader != null))
{
try
{
if (IsCounter)
{
CounterReader.EndReadMultiSampleUInt32(CurReadWaitResult);
}
else
{
AnalogReader.EndReadMultiSample(CurReadWaitResult);
}
}
catch (Exception ex)
{
/// attempt to end he read failed.
}
// clear the async result.
CurReadWaitResult = null;
}
IsReading = false;
DestroyReaderTask();
DestroyTimebaseTask();
}
/// <summary>
/// On data was read.
/// </summary>
/// <param name="rslt"></param>
protected void OnDataRead(IAsyncResult rslt)
{
if (!rslt.IsCompleted || !IsReading)
{
return;
}
DataChunk c = null;
TimeSpan offset = TimeSpan.FromSeconds(ReadTicks * 1.0 / SamplingFrequency);
if (IsCounter)
{
// data is counter.
uint[,] data = CounterReader.EndReadMultiSampleUInt32(rslt);
ReadTicks += data.GetLength(1);
c = new DataChunk(offset, data);
}
else
{
// data is analog.
double[,] data = AnalogReader.EndReadMultiSample(rslt);
// adding to the read ticks.
ReadTicks += data.GetLength(1);
c = new DataChunk(offset, data);
}
// call async again.
if (IsReading)
{
ReadData();
}
// No data.
if (c.DataCount == 0)
{
return;
}
m_dataQ.Enqueue(c);
// call to process the queue if needed.
DoQueueProcessing();
}