CounterMultiChannelReader.EndReadMultiSampleDouble Method
- Updated2023-02-21
- 2 minute(s) read
CounterMultiChannelReaderEndReadMultiSampleDouble Method
Handles the end of an asynchronous read initiated with BeginReadMultiSampleDouble(Int32, AsyncCallback, Object)
and retrieves the read samples.
Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.40.49302
Syntax
public double[,] EndReadMultiSampleDouble( IAsyncResult asyncResult )
Public Function EndReadMultiSampleDouble ( asyncResult As IAsyncResult ) As Double(,)
Parameters
- asyncResult
- Type: SystemIAsyncResult
An IAsyncResult that represents an asynchronous call started by calling BeginReadMultiSampleDouble(Int32, AsyncCallback, Object) .
Return Value
Type: DoubleA 2D array of Double samples from the task. Each element in the first dimension of the array corresponds to a channel in the task. Each element in the second dimension of the array corresponds to a sample from each of the channels. The order of the channels in the array corresponds to the order in which you add the channels to the task or to the order of the channels you specify in ChannelsToRead.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException | asyncResult is or is not an instance of IAsyncResult returned from a call to BeginReadMultiSampleDouble(Int32, AsyncCallback, Object). |
| DaqException | The NI-DAQmx driver returned an error during the asynchronous operation. |
| OutOfMemoryException | There is not enough memory to carry out this operation. |
Remarks
If you call EndReadMultiSampleDouble(IAsyncResult) before the asynchronous read represented by the provided IAsyncResult is complete, EndReadMultiSampleDouble(IAsyncResult) waits for the read to complete before returning.
NI-DAQmx scales the returned data to the units of the measurement, including any custom scaling you apply to the channel. You specify these units with the create channel methods or the DAQ Assistant.
NI-DAQmx read and write methods time out after the amount of time specified by the Timeout property on the task you are reading from or writing to.
 Note |
|---|
| Refer to Asynchronous Reads and Writes for additional information. |