NI-DAQ™mx C Reference

Status >> Total Samples Per Channel Acquired

Data Type: uInt64
Description: Indicates the total number of samples acquired by each channel. NI-DAQmx returns a single value because this value is the same for all channels. For retriggered acquisitions, this value is the cumulative number of samples across all retriggered acquisitions.
Restrictions: Not Settable

You can get this property using:
  DAQmxGetReadTotalSampPerChanAcquired

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