public string GetReaderStatus()
{
SCardContext context = new SCardContext();
context.Establish(SCardScope.System);
if (context.GetReaders().All(r => r != _connectedReader)) // Check to see if the context has _connectedReader as a reader before we use it.
{
context.Dispose();
return string.Format("{0} cannot be found in the list of connected readers", _connectedReader);
}
var state = context.GetReaderStatus(_connectedReader);
if (state == null)
{
context.Dispose();
return string.Format("Cannot get the reader status of {0}.", _connectedReader);
}
context.Dispose();
return string.Format("Name: {1}{0}Current State: {2}{0}Event State: {3}{0}" +
"Current State Value: {4}{0}Event State Value: {5}{0}" +
"User Data: {6}{0}Card Change Event Count: {7}{0}" +
"ATR: {8}{0}", Environment.NewLine, state.ReaderName, state.CurrentState,
state.EventState, state.CurrentStateValue, state.EventStateValue, state.UserData,
state.CardChangeEventCnt, state.Atr.Length == 0 ? "0" : BitConverter.ToString(state.Atr));
}
/// <summary>
/// Tries to populate the list of readers and returns it.
/// </summary>
/// <returns>Null if an error occurs. The populated string[] is successful.</returns>
public string[] PopulateReaders()
{
SCardContext context = new SCardContext();
context.Establish(SCardScope.System);
try
{
_readers = context.GetReaders();
}
catch (Exception)
{
if (_readers == null)
return null;
}
context.Dispose();
return _readers;
}
/// <summary>
/// Will try to connect to _connectedReader and read the card.
/// </summary>
/// <returns>Either the data from the card or the error message. Or if 'uidOnly' is true, just the UID prefixed with 'UID^' and ending with '^'</returns>
public string ReadCard(bool uidOnly = false)
{
SCardContext context = new SCardContext();
context.Establish(SCardScope.System);
SCardReader reader = new SCardReader(context);
SCardError result = reader.Connect(_connectedReader, SCardShareMode.Shared, SCardProtocol.Any);
if (result != SCardError.Success)
{
context.Dispose();
reader.Dispose();
return string.Format("No card is detected (or reader reserved by another application){0}{1}",
Environment.NewLine, SCardHelper.StringifyError(result));
}
string[] readerNames; SCardProtocol protocol; SCardState state; byte[] atr;
result = reader.Status(out readerNames, out state, out protocol, out atr);
if (result != SCardError.Success)
{
context.Dispose();
reader.Dispose();
return string.Format("Unable to read from card.{0}{1}", Environment.NewLine, SCardHelper.StringifyError(result));
}
string message = string.Format("Card detected:{0}Protocol: {1}{0}State: {2}{0}ATR: {3}{0}",
Environment.NewLine, protocol, state, BitConverter.ToString(atr ?? new byte[0]));
CommandApdu apdu = new CommandApdu(IsoCase.Case2Short, reader.ActiveProtocol)
{
CLA = 0xFF,
Instruction = InstructionCode.GetData,
P1 = 0x00,
P2 = 0x00,
Le = 0
};
result = reader.BeginTransaction();
if (result != SCardError.Success)
{
context.Dispose();
reader.Dispose();
return string.Format("Cannot start transaction.{0} {1}", Environment.NewLine, SCardHelper.StringifyError(result));
}
SCardPCI recievePci = new SCardPCI();
IntPtr sendPci = SCardPCI.GetPci(reader.ActiveProtocol);
byte[] recieveBuffer = new byte[256];
result = reader.Transmit(sendPci, apdu.ToArray(), recievePci, ref recieveBuffer);
if (result != SCardError.Success)
{
context.Dispose();
reader.Dispose();
return string.Format("Cannot transmit data.{0} {1}", Environment.NewLine, SCardHelper.StringifyError(result));
}
var responseApdu = new ResponseApdu(recieveBuffer, IsoCase.Case2Short, reader.ActiveProtocol);
message += string.Format("SW1: {1}{0}SW2: {2}{0}", Environment.NewLine, responseApdu.SW1, responseApdu.SW2);
string data = responseApdu.HasData ? BitConverter.ToString(responseApdu.GetData()) : "--";
if (uidOnly)
{
context.Dispose();
reader.Dispose();
return string.Format("UID^{0}^", data);
}
message += string.Format("UID: {0}",data);
reader.EndTransaction(SCardReaderDisposition.Leave);
reader.Disconnect(SCardReaderDisposition.Reset);
context.Dispose();
reader.Dispose();
return message;
}
/// <summary>
/// Will try to connect to the _connectedReader, see if there is a card present, and if so try to read the data.
/// </summary>
/// <returns>Either the error message or data from the card.</returns>
public string TryToReadCard()
{
SCardContext context = new SCardContext();
context.Establish(SCardScope.System);
SCardReader reader = new SCardReader(context);
SCardError result = SCardError.InternalError;
try
{
result = reader.Connect(_connectedReader, SCardShareMode.Shared, SCardProtocol.Any);
}
catch (Exception)
{
context.Dispose();
reader.Dispose();
return SCardHelper.StringifyError(result);
}
string message;
if (result == SCardError.Success)
{
string[] readerNames; SCardProtocol protocol; SCardState state; byte[] atr;
result = reader.Status(out readerNames, out state, out protocol, out atr);
if (result == SCardError.Success)
message = string.Format("Card detected:{0} Protocol: {1}{0} State: {2}{0} ATR: {3}",
Environment.NewLine, protocol, state, BitConverter.ToString(atr ?? new byte[0]));
else
message = string.Format("Unable to read from card.{0}{1}", Environment.NewLine,
SCardHelper.StringifyError(result));
}
else
message = string.Format("No card is detected (or reader reserved by another application){0} {1}",
Environment.NewLine, SCardHelper.StringifyError(result));
context.Dispose();
reader.Dispose();
return message;
}
/// <summary>
/// Tries to connect to the selected reader.
/// </summary>
/// <returns>Null if successful. The error message if not.</returns>
public string StartMonitoringSelectedReader(string readerName)
{
if (string.IsNullOrEmpty(readerName)) return "Reader name is null or empty";
if (!_readers.Contains(readerName)) return "The reader does not exist. [Logic Error]";
_connectedReader = readerName;
SCardContext context = new SCardContext();
context.Establish(SCardScope.System);
SCardReader reader = new SCardReader(context);
SCardError result = SCardError.InternalError;
try
{
result = reader.Connect(readerName, SCardShareMode.Shared, SCardProtocol.Any);
}
catch (Exception)
{
context.Dispose();
reader.Dispose();
return SCardHelper.StringifyError(result);
}
_monitor = new SCardMonitor(new SCardContext(), SCardScope.System, true);
_monitor.Initialized += (_cardInitalised);
_monitor.CardInserted += (_cardInserted);
_monitor.CardRemoved += (_cardRemoved);
_monitor.Start(readerName);
return null;
}
