NI-DAQmx .NET Framework 4.0 API Reference

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Table of Contents

CounterMultiChannelReader.BeginReadMultiSampleUInt32 Method

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  • Updated2023-02-21
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CounterMultiChannelReader.BeginReadMultiSampleUInt32 Method
Begins an asynchronous read of one or more UInt32 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 IAsyncResult BeginReadMultiSampleUInt32(
	int samplesPerChannel,
	AsyncCallback callback,
	Object state
)
Public Function BeginReadMultiSampleUInt32 ( 
	samplesPerChannel As Integer,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

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.
callback
Type: SystemAsyncCallback
An optional asynchronous callback that is called when the read is complete. Specify if you do not want a callback when the read is complete.
state
Type: SystemObject
A user-provided object that distinguishes this asynchronous read request from other requests. Use this parameter to provide information to the callback. Specify if you do not need to pass any additional information to the callback.

Return Value

Type: IAsyncResult
An IAsyncResult that represents the asynchronous call.

Remarks

To get the read data or any exceptions that occurred during an asynchronous read initiated with BeginReadMultiSampleUInt32(Int32, AsyncCallback, Object), call EndReadMultiSampleUInt32(IAsyncResult) with the returned IAsyncResult.

NI-DAQmx scales the read 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.

Note Note
Refer to Asynchronous Reads and Writes for additional information.

See Also

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