private void StartMonitor()
{
monitoring = true;
SCardReaderState[] state = new SCardReaderState[readernames.Length];
for (int i = 0; i < readernames.Length; i++)
{
state[i] = new SCardReaderState();
state[i].ReaderName = readernames[i];
state[i].CurrentState = SCRState.Unaware; /* force SCardGetStatusChange to return
* immediately with the current reader state */
}
SCardError rc = context.GetStatusChange(IntPtr.Zero, state);
if (rc == SCardError.Success)
{
// initialize event
if (Initialized != null)
{
for (int i = 0; i < state.Length; i++)
{
Initialized(this,
new CardStatusEventArgs(readernames[i],
(state[i].EventState & (~(SCRState.Changed))),
state[i].ATR));
previousState[i] = state[i].EventState & (~(SCRState.Changed)); // remove "Changed"
previousStateValue[i] = state[i].EventStateValue;
}
}
while (true)
{
for (int i = 0; i < state.Length; i++)
{
state[i].CurrentStateValue = previousStateValue[i];
}
// block until status change occurs
rc = context.GetStatusChange(SCardReader.Infinite, state);
// Cancel?
if (rc != SCardError.Success)
{
break;
}
for (int i = 0; i < state.Length; i++)
{
SCRState newState = state[i].EventState;
newState &= (~(SCRState.Changed)); // remove "Changed"
byte[] Atr = state[i].ATR;
// Status change
if (StatusChanged != null &&
(previousState[i] != newState))
{
StatusChanged(this,
new StatusChangeEventArgs(readernames[i],
previousState[i],
newState,
Atr));
}
// Card inserted
if (((newState & SCRState.Present) == SCRState.Present) &&
((previousState[i] & SCRState.Empty) == SCRState.Empty))
{
if (CardInserted != null)
{
CardInserted(this,
new CardStatusEventArgs(readernames[i],
newState,
Atr));
}
}
// Card removed
if (((newState & SCRState.Empty) == SCRState.Empty) &&
((previousState[i] & SCRState.Present) == SCRState.Present))
{
if (CardRemoved != null)
{
CardRemoved(this,
new CardStatusEventArgs(readernames[i],
newState,
Atr));
}
}
previousState[i] = newState;
previousStateValue[i] = state[i].EventStateValue;
}
}
}
monitoring = false;
if (rc != SCardError.Cancelled)
{
if (MonitorException != null)
{
MonitorException(this, new PCSCException(rc,
"An error occured during SCardGetStatusChange(..)."));
}
}
}
