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NI-DAQmx Base 3.x C Function Reference Help
Conventions
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Key Concepts
Clocks
Terminal Names
Task Configuration/Control
DAQmxBaseClearTask
DAQmxBaseCreateTask
DAQmxBaseIsTaskDone
DAQmxBaseLoadTask
DAQmxBaseResetDevice
DAQmxBaseStartTask
DAQmxBaseStopTask
Channel Configuration/Creation
Create Analog Input Channels
DAQmxBaseCreateAIThrmcplChan
DAQmxBaseCreateAIVoltageChan
Create Analog Output Channel
DAQmxBaseCreateAOVoltageChan
Create Digital Input Channels
DAQmxBaseCreateDIChan
Create Digital Output Channels
DAQmxBaseCreateDOChan
Create Counter Input Channels
DAQmxBaseCreateCIPeriodChan
DAQmxBaseCreateCICountEdgesChan
DAQmxBaseCreateCIPulseWidthChan
Position
DAQmxBaseCreateCILinEncoderChan
DAQmxBaseCreateCIAngEncoderChan
Create Counter Output Channels
DAQmxBaseCreateCOPulseChanFreq
Timing
DAQmxBaseCfgSampClkTiming
DAQmxBaseCfgImplicitTiming
Triggering
Start Trigger
DAQmxBaseDisableStartTrig
DAQmxBaseCfgDigEdgeStartTrig
DAQmxBaseCfgAnlgEdgeStartTrig
Reference Trigger
DAQmxBaseCfgAnlgEdgeRefTrig
DAQmxBaseCfgDigEdgeRefTrig
DAQmxBaseDisableRefTrig
Read Functions
DAQmxBaseReadAnalogF64
DAQmxBaseReadBinaryI16
DAQmxBaseReadCounterF64
DAQmxBaseReadCounterScalarF64
DAQmxBaseReadCounterScalarU32
DAQmxBaseReadCounterU32
DAQmxBaseReadDigitalScalarU32
DAQmxBaseReadDigitalU32
DAQmxBaseReadDigitalU8
Write Functions
DAQmxBaseWriteAnalogF64
DAQmxBaseWriteDigitalU8
DAQmxBaseWriteDigitalU32
DAQmxBaseWriteDigitalScalarU32
Export HW Signals
DAQmxBaseExportSignal
Internal Buffer Configuration
DAQmxBaseCfgInputBuffer
Error Handling
DAQmxBaseGetExtendedErrorInfo
Glossary
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WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
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DAQmxBaseReadAnalogF64

int32 DAQmxBaseReadAnalogF64 (TaskHandle taskHandle, int32 numSampsPerChan, float64 timeout, bool32 fillMode, float64 readArray[ ], uInt32 arraySizeInSamps, int32 *sampsPerChanRead, bool32 *reserved);

Purpose

Reads multiple floating-point samples from a task that contains one or more analog input channels.

Parameters

Input
Name Type Description
taskHandle TaskHandle The task to read samples from.
numSampsPerChan int32 The number of samples, per channel, to read. If the task acquires a finite number of samples and you set this parameter to -1, the function waits for the task to acquire all requested samples, and then reads those samples.
timeout float64 The amount of time, in seconds, to wait for the function to read the sample(s). This function returns an error if the timeout elapses.

fillMode bool32 Specifies whether or not the samples are interleaved.
Value Description
DAQmx_Val_GroupByChannel Group by channel (non-interleaved)
DAQmx_Val_GroupByScanNumber Group by scan number (interleaved)
arraySizeInSamps uInt32 The size of the array, in samples, into which data is read.
reserved bool32 * Reserved for future use. Pass NULL to this parameter.
Output
Name Type Description
readArray float64 [ ] The array to read data into, organized according to fillMode.
sampsPerChanRead int32 * The actual number of samples read from each channel.

Return Value

Name Type Description
status int32 The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error.
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