Measurement-computing DAQFlex User Guide Uživatelský manuál stáhnout pdf (Strana 28)

DAQFlex Software User's Guide DAQFlex Software Reference

DaqDevice.WriteScanData()

Outputs scan data.

C#:

void WriteScanData(double[,] scanData, int numberOfSamplesPerChannel,

int timeOut);

VB:

Sub WriteScanData(ByVal ScanData(,) As Double, ByVal

NumberOfSamplesPerChannel As Integer, ByVal TimeOut As Integer)

Parameter

scanData

Array of data samples to output.

numberOfSamplesPerChannel

The number of data samples per channel to transfer from the scanData array to the device's output

buffer.

timeOut

The number of milliseconds to wait for available space in the buffer to write to. This only takes

effect when an output scan is running.

Remarks

 WriteScanData may be called while a scan is running. However, the maximum number of total

samples must be less than or equal to half the number of samples for which the buffer is allocated.

Set the buffer size with the "AOSCAN:BUFSIZE" message.

DaqDevice.EnableCallback()

Enables a user-defined callback method to be invoked when a certain condition is met.

C#:

void EnableCallback(ErrorCodes errorCode, InputScanCallbackDelegate

callback, CallbackType callbackType, Object callbackData

VB:

Sub EnableCallback(ByVal errorCode as ErrorCodes, ByVal callback as

InputScanCallbackDelegate, ByVal callbackType As CallbackType, ByVal

callbackData As Object)

Parameter

callback

The method to be invoked when the condition specified by callbackType is met. Refer to

InputScanCallback Delegate on page 29 for the format of the method.

callbackType

The condition that invokes the callback method. Callback types are defined by the CallbackType

enumeration. The supported types are:

o CallbackType.OnDataAvailable – Invokes the callback method when the number of samples

available for reading data is ≥ the number of samples specified by the callbackData parameter.

o CallbackType.OnInputScanComplete – Invokes the callback method when an input scan

completes or is stopped.

o CallbackType.OnInputScanError – Invokes the callback method when an input scan error

occurs.

callbackData

When callbackType is set to OnDataAvailable, set callbackData to the number of samples per

channel to acquire before invoking the user-defined callback method. When callbackType is set to

OnInputScanComplete or OnInputScanError, set callbackData to null or Nothing.

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