private void cmdEnableEvent_Click(object sender, System.EventArgs e)
{
/// Enable and connect one or more event types to a single user callback
/// function using MccDaq.MccBoard.EnableEvent().
///
/// If we want to attach a single callback function to more than one event
/// type, we can do it in a single call to MccDaq.MccBoard.EnableEvent, or we can do this in
/// separate calls for each event type. The main disadvantage of doing this in a
/// single call is that if the call generates an error, we will not know which
/// event type caused the error. In addition, the same error condition could
/// generate multiple error messages.
///
/// Parameters:
/// eventType :the condition that will cause an event to fire
/// eventSize :only used for MccDaq.EventType.OnDataAvailable to determine how
/// many samples to collect before firing an event
/// _ptrMyCallback : a pointer to the user function or event handler
/// to call when above event type occurs. Note that the handler
/// can be a delegate or a static member function. Here, we use
/// a pointer to a static member function.
///
/// _ptrUserData : a pointer to a value type that will be used within the event
/// handler. Since our handler is a static member function which
/// does NOT include a reference to this class instance, we're
/// sending the pointer to a struct that holds a reference to the class.
uint eventSize = 0;
MccDaq.EventType eventType = MccDaq.EventType.OnEndOfAiScan;
MccDaq.ErrorInfo ULStat =
DaqBoard.EnableEvent(eventType, eventSize, _ptrMyCallback, _ptrUserData);
bool ValidEntry = uint.TryParse(txtEventSize.Text, out eventSize);
eventType = MccDaq.EventType.OnDataAvailable;
if (ValidEntry)
{
ULStat = DaqBoard.EnableEvent
(eventType, eventSize, _ptrMyCallback, _ptrUserData);
}
else
{
ULStat = DaqBoard.DisableEvent(eventType);
}
eventType = MccDaq.EventType.OnScanError;
ULStat = DaqBoard.EnableEvent(eventType, 0, _ptrOnScanError, _ptrUserData);
cmdEnableEvent.Enabled = false;
}
