Measurement Computing DAQFlex User Guide - Manual (Page 29)

DAQFlex Software User's Guide DAQFlex Software Reference
29
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.