internal void UpdateReaderStates()
{
//suspend poll thread & wait until current update is finished
this.synchronousStateUpdateInProgress.Reset();
this.scardApi.Cancel();
this.currentStatusUpdateFinished.WaitOne();
SCardCardReaderState[] CardReaderstates = new SCardCardReaderState[this.Readers.Count];
for (int Index = 0; Index < this.Readers.Count; Index++)
{
CardReaderstates[Index] = ((PcscCardReader)this.Readers[Index]).CardReaderState;
CardReaderstates[Index].dwCurrentState = SCardReaderState.Unaware;
}
if (this.scardApi.GetStatusChange(-1, CardReaderstates))
{
//Only update if not cancelled (at app end)
foreach (SCardCardReaderState Readerstate in CardReaderstates)
{
if ((Readerstate.dwEventState & SCardReaderState.Changed) != 0)
{
this.UpdateReaderState(Readerstate, Readerstate.szCardReader);
}
}
}
//resume polling thread
this.synchronousStateUpdateInProgress.Set();
}
private void UpdateReaderState(SCardCardReaderState state, string cardReaderName)
{
PcscCardReader CardReader = (PcscCardReader)this.Readers[cardReaderName];
SCardReaderState NewState = state.dwEventState;
if ((NewState & SCardReaderState.Unavailable) != 0 && this.scardApi.ListReaders().Contains(cardReaderName) == false)
{
//CardReader was removed, if state changes to unavailiable _and_ reader is not in the list anymore.
//Otherwise, reader was opened in direct mode
this.RemoveCardReader(CardReader);
return;
}
else
{
try
{
// CardReader state changed
CardReader.CardReaderState = state;
return;
}
catch (Exception Error)
{
Trace.Fail($"Exception was thrown inside status change handler. This may lead to a blocking application! Origianl Exception was: {Error.Message}");
throw;
}
}
}
private void UpdateCardReaderStatus()
{
SCardCardReaderState[] CardReaderstates = new SCardCardReaderState[this.owner.Readers.Count + 1];
for (int Index = 0; Index < this.owner.Readers.Count; Index++)
{
CardReaderstates[Index] = ((PcscCardReader)this.owner.Readers[Index]).CardReaderState;
}
SCardCardReaderState PnpNotificationReaderstate = new SCardCardReaderState
{
szCardReader = PollThread.PnpNotificationDeviceName,
dwCurrentState =
this.pnpNotificationDeviceState
};
CardReaderstates[CardReaderstates.Length - 1] = PnpNotificationReaderstate;
if (this.scardApi.GetStatusChange(-1, CardReaderstates))
{
//Only update if not cancelled (at app end)
foreach (SCardCardReaderState Readerstate in CardReaderstates)
{
if ((Readerstate.dwEventState & SCardReaderState.Changed) != 0)
{
this.HandleCardReaderStateChange(Readerstate.szCardReader, Readerstate);
}
}
}
}
internal PcscCardReader(PcscSmartCardSubsystem pcscSubsystem, SCardApi scardApi, string name)
: base(name)
{
this.pcscSubsystem = pcscSubsystem;
this.scardApi = scardApi;
this.cardReaderState = new SCardCardReaderState
{
dwCurrentState = SCardReaderState.Unaware,
szCardReader = name
};
}
private void HandleCardReaderStateChange(string cardReaderName, SCardCardReaderState state)
{
if (cardReaderName == PollThread.PnpNotificationDeviceName)
{
this.pnpNotificationDeviceState = state.dwEventState;
this.owner.InsertNewCardReaders();
}
else
{
this.owner.UpdateReaderState(state, cardReaderName);
return;
}
}