ScopeChannelMeasurement.BeginFetchDouble Method

public IAsyncResult BeginFetchDouble(
	PrecisionTimeSpan timeout,
	long numberOfSamples,
	AnalogWaveformCollection<double> waveforms,
	AsyncCallback callback,
	Object asyncState
)

Public Function BeginFetchDouble ( 
	timeout As PrecisionTimeSpan,
	numberOfSamples As Long,
	waveforms As AnalogWaveformCollection(Of Double),
	callback As AsyncCallback,
	asyncState As Object
) As IAsyncResult

Parameters

timeout

Type: NationalInstrumentsPrecisionTimeSpan
The time to wait for data to be acquired. Using 0 for this parameter tells NI-SCOPE to fetch whatever is currently available. Using -1 for this parameter implies infinite timeout.

numberOfSamples

Type: SystemInt64
The maximum number of samples to fetch for each waveform. If the acquisition finishes with fewer points than requested, some instruments return partial data if the acquisition finished, was aborted, or a timeout of 0 was used. Use –1 for this parameter if you want to fetch all available samples. The method reads the actual record length and attempts to acquire all available samples. If it fails to complete within the timeout period, the method returns an error.

waveforms

Type: NationalInstrumentsAnalogWaveformCollectionDouble
A scaled voltage waveform array of type AnalogWaveformCollectionTData.

callback

Type: SystemAsyncCallback
A delegate of type AsyncCallback, which will be invoked once the operation is complete.

asyncState

Type: SystemObject
The state of the asynchronous operation.

Return Value

Reference