public void PerformCardOperation()
{
switch (state)
{
case CardReaderState.Discard:
IdleState();
break;
case CardReaderState.Insert:
state = CardReaderState.Hold;
InsertCard();
break;
case CardReaderState.Hold:
state = CardReaderState.Discard;
CardTasks();
break;
}
}
private void PollCardReaderState()
{
CardReaderState NewState = CardReaderState.Unknown;
bool SimulateCardRemoved = false;
this.BeginAtomic();
try
{
IntPtr Handle = this.AcquireHandle();
try
{
// Get Card status
ScpCommands.CardStatus Status = ScpCommands.GetStatus(Handle);
switch (Status)
{
case ScpCommands.CardStatus.NoCard:
NewState = CardReaderState.NoCard;
break;
case ScpCommands.CardStatus.CardInsertedPowerOff:
NewState = CardReaderState.CardPresent;
break;
case ScpCommands.CardStatus.CardInsertedPowerOn:
NewState = CardReaderState.CardExclusivelyInUse;
break;
default:
NewState = CardReaderState.Unknown;
break;
}
// Get ATR
if (Status == ScpCommands.CardStatus.CardInsertedPowerOff) //do NOT check power on cards, because the ATR cannot chnage when the card is powered!
{
ScpCommands.SelectApplicationProtocol(Handle, Scap.T0);
byte[] Atr = ScpCommands.PowerOn(Handle, false);
if (this.atr != null && !Atr.HasEqualValue(this.atr))
{
//Card was changed during polls -> simulate 'card removed' event
SimulateCardRemoved = true;
}
this.atr = Atr;
ScpCommands.PowerOff(Handle);
}
else if (Status == ScpCommands.CardStatus.CardInsertedPowerOn && this.handleCount == 0)
{
// the card is powered, but we didn't do it (is done at 'connect', but then the handle count must be greater)
NewState = CardReaderState.Unknown;
}
}
// ReSharper disable EmptyGeneralCatchClause
catch
{
//Do nothing in case of error (next loop)
}
finally
{
this.ReleaseHandle();
}
}
catch
{
//Do nothing in case of error (next loop)
}
finally
{
this.EndAtomic();
}
// ReSharper restore EmptyGeneralCatchClause
if (SimulateCardRemoved)
{
this.state = CardReaderState.NoCard;
this.InvokeStateChanged();
}
if (this.State != NewState)
{
this.state = NewState;
this.InvokeStateChanged();
}
Thread.Sleep(1000);
}