NI-DAQmx .NET Framework 4.5 API Reference

DigitalMultiChannelReader.MemoryOptimizedReadSingleSampleMultiLine Method

  • Updated2023-02-21
  • 2 minute(s) read
DigitalMultiChannelReader.MemoryOptimizedReadSingleSampleMultiLine Method
Reads a single sample containing Boolean values from one or more DIChannel objects in a task. Each channel can contain multiple digital lines.

Namespace:  NationalInstruments.DAQmx
Assembly:  NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.45.49302

Syntax

public bool[,] MemoryOptimizedReadSingleSampleMultiLine(
	bool[,] data
)
Public Function MemoryOptimizedReadSingleSampleMultiLine ( 
	data As Boolean(,)
) As Boolean(,)

Parameters

data
Type: SystemBoolean
An initialized 2D array of boolean samples that contains the read data. 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 line in that channel. 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

Return Value

Type: Boolean
A reference to the data parameter containing samples from the task.

Exceptions

ExceptionCondition
ArgumentException
  1. If data is or is uninitialized; or
  2. If the first dimension of data does not match the number of channels.
DaqExceptionThe NI-DAQmx driver returned an error.
OutOfMemoryExceptionThere is not enough memory to carry out this operation.

Remarks

If the data buffer is large enough to hold the number of samples requested, this overload attempts to reuse existing memory allocated from the array to acquire data. This results in more efficient memory allocation when performing multiple reads with a continuous digital input task.

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.

See Also

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