Inputscancallback delegate, Daqdevice.disablecallback(), Daqdevice.geterrormessage() – Measurement Computing DAQFlex User Guide User Manual

Page 29: Disablecallback(), Geterrormessage()

DAQFlex Software User's Guide

DAQFlex Software Reference

Return value

The value of callbackType.

Remarks



This method is used in conjunction with input scan operations.



EnableCallback may be called once for each callback type. If it is called more than once for the

sample callback type, a DaqException is thrown.

InputScanCallback Delegate

A delegate is a data structure that refers either to a static method, or to a class instance and an

instance method of that class. You call the delegate by passing either its address or a pointer to the

delegate to the callback parameter of the

EnableCallback()

method.

C#:

public delegate void
InputScanCallbackDelegate(MeasurementComputing.DAQFlex.ErrorCodes
errorCode, MeasurementComputing.DAQFlex.CallbackType callbackType,
object callbackData)

VB:

Public Delegate Sub InputScanCallbackDelegate(ByVal errorCode As
MeasurementComputing.DAQFlex.ErrorCodes, ByVal callbackType As
MeasurementComputing.DAQFlex.CallbackType, ByVal callbackData As
Object)

DaqDevice.DisableCallback()

Disables the invocation of the user-defined callback method associated with the callback type.

C#:

void DisableCallback(CallbackType callbackType)

VB:

Sub DisableCallback(ByVal callbackType As CallbackType)

Parameter

callbackType

The callback type to disable.

DaqDevice.GetErrorMessage()

Gets the error message associated with the error code that is passed to the user-defined callback.

C#:

string GetErrorMessage(ErrorCodes errorCode)

VB:

Function GetErrorMessage(ByVal errorCode As ErrorCodes)

Parameter

errorCode

The error code that was passed to the user-defined callback method.

Return value

The error message associated with the error code passed to the user-defined callback method.