public void fillReader()
{
int ReaderCount = 255;
byte[] retData;
byte[] sReaderGroup = null;
string[] readerList;
string readerStr = string.Empty;
readerList = null;
int retCode;
IntPtr hContext = new IntPtr();
if (doCardPolling)
{
throw new Exception("Card polling already started");
}
retCode = PcscProvider.SCardEstablishContext(PcscProvider.SCARD_SCOPE_USER, 0, 0, ref hContext);
if (retCode != PcscProvider.SCARD_S_SUCCESS)
{
throw new Exception("Unable to establish context - " + PcscProvider.GetScardErrMsg(retCode));
}
retCode = PcscProvider.SCardListReaders(hContext, null, null, ref ReaderCount);
if (retCode != PcscProvider.SCARD_S_SUCCESS)
{
throw new Exception("List Reader Failed - " + PcscProvider.GetScardErrMsg(retCode));
}
retData = new byte[ReaderCount];
retCode = PcscProvider.SCardListReaders(hContext, sReaderGroup, retData, ref ReaderCount);
if (retCode != PcscProvider.SCARD_S_SUCCESS)
{
throw new Exception("List Reader Failed - " + PcscProvider.GetScardErrMsg(retCode));
}
//Convert retData(Hexadecimal) value to String
readerStr = System.Text.ASCIIEncoding.ASCII.GetString(retData).Trim('\0');
readerList = readerStr.Split('\0');
foreach (string rdr in readerList)
{
_readers.Add(rdr);
}
}
public PcscException(int errCode)
{
_errorCode = errCode;
_message = PcscProvider.GetScardErrMsg(errCode);
}
void bw_DoWork(object sender, DoWorkEventArgs e)
{
try
{
int retCode;
IntPtr hContext = new IntPtr();
CardPollingEventArg arg = new CardPollingEventArg();
arg.reader = e.Argument.ToString();
arg.status = CARD_STATUS.UNKNOWN;
retCode = PcscProvider.SCardEstablishContext(PcscProvider.SCARD_SCOPE_USER, 0, 0, ref hContext);
if (retCode != PcscProvider.SCARD_S_SUCCESS)
{
throw new Exception("Unable to establish context", new Exception(PcscProvider.GetScardErrMsg(retCode)));
}
BackgroundWorker bwOwner = (BackgroundWorker)sender;
while (!bwOwner.CancellationPending)
{
PcscProvider.SCARD_READERSTATE state = new PcscProvider.SCARD_READERSTATE();
state.szReader = e.Argument.ToString();
retCode = PcscProvider.SCardGetStatusChange(hContext, 3000, ref state, 1);
if (retCode != 0)
{
if (arg.status != CARD_STATUS.ERROR)
{
arg.status = CARD_STATUS.ERROR;
CardPollingErrorEventArg errorArg = new CardPollingErrorEventArg();
errorArg.errorCode = retCode;
errorArg.errorMessage = PcscProvider.GetScardErrMsg(retCode);
errorArg.reader = e.Argument.ToString();
bwOwner.ReportProgress(-1, errorArg);
}
}
else
{
//state.dwCurrentState >>= 32;
if ((state.dwEventState & PcscProvider.SCARD_STATE_PRESENT) == PcscProvider.SCARD_STATE_PRESENT)
{
if (arg.status != CARD_STATUS.CARD_FOUND)
{
arg.status = CARD_STATUS.CARD_FOUND;
arg.atr = state.rgbAtr.Take(state.cbAtr).ToArray();
bwOwner.ReportProgress(0, arg);
}
}
else
{
if (arg.status != CARD_STATUS.CARD_NOT_FOUND)
{
arg.status = CARD_STATUS.CARD_NOT_FOUND;
bwOwner.ReportProgress(0, arg);
}
}
}
System.Threading.Thread.Sleep(500);
}
PcscProvider.SCardReleaseContext(hContext);
}
catch (Exception ex)
{
}
}