CounterMultiChannelReader.ReadMultiSampleDouble Method
- Updated2023-02-21
- 2 minute(s) read
CounterMultiChannelReaderReadMultiSampleDouble Method
Reads one or more Double samples from one or more CIChannel objects in a task.
Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.40.49302
Syntax
public double[,] ReadMultiSampleDouble( int samplesPerChannel )
Public Function ReadMultiSampleDouble ( samplesPerChannel As Integer ) As Double(,)
Parameters
- samplesPerChannel
- Type: SystemInt32
The number of samples to read. If you set samplesPerChannel to -1 for a continuous acquisition, the read retrieves all samples available in the buffer at the time of the read. If you set samplesPerChannel to -1 for a finite acquisition, the read behavior is set by the ReadAllAvailableSamples property of the DaqStream you are reading from.
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 |
|---|---|
| DaqException | The NI-DAQmx driver returned an error. |
| OutOfMemoryException | There is not enough memory to carry out this operation. |
Remarks
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.
Refer to NI-DAQmx Readers and Writers for more information about memory limitations in NI-DAQmx read methods.