public static bool CardPresent(string readerName)
{
int retCode;
IntPtr hContext = new IntPtr();
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)));
}
PcscProvider.SCARD_READERSTATE state = new PcscProvider.SCARD_READERSTATE();
state.szReader = readerName;
retCode = PcscProvider.SCardGetStatusChange(hContext, 3000, ref state, 1);
if (retCode != 0)
{
throw new Exception("Unable to get status", new Exception(PcscProvider.GetScardErrMsg(retCode)));
}
else
{
//state.dwCurrentState >>= 32;
if (((Int32)(state.dwEventState) & PcscProvider.SCARD_STATE_PRESENT) == PcscProvider.SCARD_STATE_PRESENT)
{
return(true);
}
else
{
return(false);
}
}
}
void establishContext()
{
int retCode;
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));
}
}