DigitalMultiChannelReader.MemoryOptimizedReadSingleSampleMultiLine Method
- Updated2023-02-21
- 2 minute(s) read
Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.40.49302
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: BooleanA reference to the data parameter containing samples from the task.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException |
|
| DaqException | The NI-DAQmx driver returned an error. |
| OutOfMemoryException | There 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.