CounterSingleChannelReader.BeginReadSingleSampleDouble Method
- Updated2023-02-21
- 2 minute(s) read
CounterSingleChannelReaderBeginReadSingleSampleDouble Method
Begins an asynchronous read of a Double sample from a counter task.
Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.40.49302
Syntax
public IAsyncResult BeginReadSingleSampleDouble( AsyncCallback callback, Object state )
Public Function BeginReadSingleSampleDouble ( callback As AsyncCallback, state As Object ) As IAsyncResult
Parameters
- 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: IAsyncResultAn IAsyncResult that represents the asynchronous call.
Remarks
To get the read data or any exceptions that occurred during an asynchronous read initiated with BeginReadSingleSampleDouble(AsyncCallback, Object), call EndReadSingleSampleDouble(IAsyncResult) with the returned IAsyncResult.
Use this method when counter samples are scaled to a floating-point value, such as for frequency and period measurement.
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 |
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| Refer to Asynchronous Reads and Writes for additional information. |