/// <summary>
/// Monitor a card reader device for card insertion and removal
/// Use OnCardInserted+= and OnCardRemoved+= to establish the handlers
/// </summary>
/// <param name="reader">The reader name to monitor</param>
protected override void RunCardDetection(String reader)
{
const long SCARD_S_SUCCESS = 0x00; // for readability
IntPtr hContext = IntPtr.Zero; // SCARDCONTEXT (ULONG_PTR)
IntPtr phContext = IntPtr.Zero; // *SCARDCONTEXT (*ULONG_PTR)
try
{
phContext = Marshal.AllocHGlobal(Marshal.SizeOf(hContext));
if (PCSC.SCardEstablishContext((uint)SCOPE.User, IntPtr.Zero, IntPtr.Zero, phContext) != SCARD_S_SUCCESS)
return;
hContext = Marshal.ReadIntPtr(phContext);
UInt32 nbReaders = 1;
PCSC.SCard_ReaderState[] readerState = new PCSC.SCard_ReaderState[nbReaders];
readerState[0].CurrentState = (UInt32)PCSC.CARD_STATE.UNAWARE;
readerState[0].Reader = reader;
while (true)
{
if (PCSC.SCardGetStatusChange(hContext, WAIT_TIME, readerState, nbReaders) == SCARD_S_SUCCESS)
{
UInt32 currentState = readerState[0].CurrentState; // the old state (as known by the application)
UInt32 eventState = readerState[0].EventState; // the new state (as known by Windows)
// fatal status codes, stop monitoring for insertion/removal
if (((eventState & (uint)PCSC.CARD_STATE.UNKNOWN) == (uint)PCSC.CARD_STATE.UNKNOWN) || // reader is unknown
((eventState & (uint)PCSC.CARD_STATE.IGNORE) == (uint)PCSC.CARD_STATE.IGNORE) || // reader should be ignored
((eventState & (uint)PCSC.CARD_STATE.UNAVAILABLE) == (uint)PCSC.CARD_STATE.UNAVAILABLE)) // reader is unavailable
m_bRunCardDetection = false;
// we can't determine card insertion/removal on first pass (CurrentState == UNAWARE)
if (readerState[0].CurrentState != (uint)PCSC.CARD_STATE.UNAWARE)
{
bool cardIsPresent = ((eventState & (uint)PCSC.CARD_STATE.PRESENT) == (uint)PCSC.CARD_STATE.PRESENT);
bool cardWasPresent = ((currentState & (uint)PCSC.CARD_STATE.PRESENT) == (uint)PCSC.CARD_STATE.PRESENT);
if (cardIsPresent && !cardWasPresent)
CardInserted(reader);
if (cardWasPresent && !cardIsPresent)
CardRemoved(reader);
}
// The current state is now the event state
readerState[0].CurrentState = eventState;
}
if (m_bRunCardDetection == false)
break;
Thread.Sleep(100);
}
}
catch // since this executes in a thread we must prevent
{ } // exceptions from escaping or they will be unhandled
finally
{
if (phContext != IntPtr.Zero)
Marshal.FreeHGlobal(phContext);
if (hContext != IntPtr.Zero)
PCSC.SCardReleaseContext(hContext);
}
}
/// <summary>
/// This function must implement a card detection mechanism.
///
/// When card insertion is detected, it must call the method CardInserted()
/// When card removal is detected, it must call the method CardRemoved()
///
/// </summary>
protected override void RunCardDetection(string reader)
{
bool bFirstLoop = true;
IntPtr hContext = IntPtr.Zero; // Local context
IntPtr phContext;
phContext = Marshal.AllocHGlobal(Marshal.SizeOf(hContext));
if (PCSC.SCardEstablishContext((uint)SCOPE.User, IntPtr.Zero, IntPtr.Zero, phContext) == 0)
{
hContext = Marshal.ReadIntPtr(phContext);
Marshal.FreeHGlobal(phContext);
UInt32 nbReaders = 1;
PCSC.SCard_ReaderState[] readerState = new PCSC.SCard_ReaderState[nbReaders];
readerState[0].CurrentState = (UInt32)PCSC.CARD_STATE.UNAWARE;
readerState[0].Reader = reader;
UInt32 eventState;
UInt32 currentState = readerState[0].CurrentState;
// Card detection loop
do
{
if (PCSC.SCardGetStatusChange(hContext, WAIT_TIME
, readerState, nbReaders) == 0)
{
eventState = readerState[0].EventState;
currentState = readerState[0].CurrentState;
if (bFirstLoop)
{
// Check if a card is already inserted
if ((eventState & (uint)PCSC.CARD_STATE.PRESENT) == (uint)PCSC.CARD_STATE.PRESENT)
{
CardInserted(reader);
}
}
else if (((eventState & (uint)PCSC.CARD_STATE.CHANGED) == (uint)PCSC.CARD_STATE.CHANGED) && !bFirstLoop)
{
// State has changed
if ((eventState & (uint)PCSC.CARD_STATE.EMPTY) == (uint)PCSC.CARD_STATE.EMPTY)
{
// There is no card, card has been removed -> Fire CardRemoved event
CardRemoved(reader);
}
if (((eventState & (uint)PCSC.CARD_STATE.PRESENT) == (uint)PCSC.CARD_STATE.PRESENT) &&
((eventState & (uint)PCSC.CARD_STATE.PRESENT) != (currentState & (uint)PCSC.CARD_STATE.PRESENT)) &&
((eventState & (uint)PCSC.CARD_STATE.MUTE) != (uint)PCSC.CARD_STATE.MUTE))
{
// There is a card in the reader -> Fire CardInserted event
CardInserted(reader);
}
if ((eventState & (uint)PCSC.CARD_STATE.ATRMATCH) == (uint)PCSC.CARD_STATE.ATRMATCH)
{
// There is a card in the reader and it matches the ATR we were expecting-> Fire CardInserted event
CardInserted(reader);
}
}
// The current state is now the event state
readerState[0].CurrentState = eventState;
bFirstLoop = false;
}
Thread.Sleep(100);
if (m_bRunCardDetection == false)
break;
}
while (true); // Exit on request
}
else
{
Marshal.FreeHGlobal(phContext);
throw new Exception("PC/SC error");
}
PCSC.SCardReleaseContext(hContext);
}
/// <summary>
/// This function must implement a card detection mechanism.
///
/// When card insertion is detected, it must call the method CardInserted()
/// When card removal is detected, it must call the method CardRemoved()
///
/// </summary>
private void RunCardDetection(object Reader)
{
bool bFirstLoop = true;
IntPtr hContext = IntPtr.Zero; // Local context
IntPtr phContext;
phContext = Marshal.AllocHGlobal(Marshal.SizeOf(hContext));
if (PCSC.SCardEstablishContext((uint)SCOPE.User, IntPtr.Zero, IntPtr.Zero, phContext) == 0)
{
hContext = Marshal.ReadIntPtr(phContext);
Marshal.FreeHGlobal(phContext);
UInt32 nbReaders = 1;
PCSC.SCard_ReaderState[] readerState = new PCSC.SCard_ReaderState[nbReaders];
readerState[0].CurrentState = (UInt32)PCSC.CARD_STATE.UNAWARE;
readerState[0].Reader = (string)Reader;
UInt32 eventState;
UInt32 currentState = readerState[0].CurrentState;
// Card detection loop
do
{
if (PCSC.SCardGetStatusChange(hContext, WAIT_TIME, readerState, nbReaders) == 0)
{
eventState = readerState[0].EventState;
currentState = readerState[0].CurrentState;
// Check state
if (((eventState & (uint)PCSC.CARD_STATE.CHANGED) == (uint)PCSC.CARD_STATE.CHANGED) && !bFirstLoop)
{
// State has changed
if ((eventState & (uint)PCSC.CARD_STATE.EMPTY) == (uint)PCSC.CARD_STATE.EMPTY)
{
// There is no card, card has been removed -> Fire CardRemoved event
RaiseCardRemoved((string)Reader);
}
if (((eventState & (uint)PCSC.CARD_STATE.PRESENT) == (uint)PCSC.CARD_STATE.PRESENT) &&
((eventState & (uint)PCSC.CARD_STATE.PRESENT) != (currentState & (uint)PCSC.CARD_STATE.PRESENT)))
{
// There is a card in the reader -> Fire CardInserted event
RaiseCardInserted((string)Reader);
}
if ((eventState & (uint)PCSC.CARD_STATE.ATRMATCH) == (uint)PCSC.CARD_STATE.ATRMATCH)
{
// There is a card in the reader and it matches the ATR we were expecting-> Fire CardInserted event
RaiseCardInserted((string)Reader);
}
}
// The current stateis now the event state
readerState[0].CurrentState = eventState;
bFirstLoop = false;
}
Thread.Sleep(100);
if (runCardDetectionFlag == false)
{
break;
}
}while (true); // Exit on request
}
else
{
Marshal.FreeHGlobal(phContext);
throw new Exception("PC/SC error");
}
PCSC.SCardReleaseContext(hContext);
}
