private void UpdateState()
{
uint rc;
IntPtr hContext = IntPtr.Zero;
_reader_state = SCARD.STATE_UNAWARE;
_card_atr = null;
rc =
SCARD.EstablishContext(_scope, IntPtr.Zero, IntPtr.Zero, ref hContext);
if (rc != SCARD.S_SUCCESS)
{
_last_error = rc;
return;
}
SCARD.READERSTATE[] states = new SCARD.READERSTATE[1];
states[0] = new SCARD.READERSTATE();
states[0].szReader = _reader_name;
states[0].pvUserData = IntPtr.Zero;
states[0].dwCurrentState = 0;
states[0].dwEventState = 0;
states[0].cbAtr = 0;
states[0].rgbAtr = null;
try
{
rc = SCARD.GetStatusChange(hContext, 0, states, 1);
}
catch (ThreadInterruptedException)
{
rc = SCARD.E_CANCELLED;
}
if (rc != SCARD.S_SUCCESS)
{
SCARD.ReleaseContext(hContext);
return;
}
SCARD.ReleaseContext(hContext);
_reader_state = states[0].dwEventState;
if ((_reader_state & SCARD.STATE_PRESENT) != 0)
{
_card_atr = new CardBuffer(states[0].rgbAtr, (int)states[0].cbAtr);
}
}
public static string[] GetReaderList(uint Scope, string Groups)
{
IntPtr hContext = IntPtr.Zero;
uint rc;
rc = SCARD.EstablishContext(Scope, IntPtr.Zero, IntPtr.Zero, ref hContext);
if (rc != SCARD.S_SUCCESS)
{
return(null);
}
string[] readers = GetReaderList(hContext, Groups);
SCARD.ReleaseContext(hContext);
return(readers);
}
private void StatusChangeMonitor()
{
try
{
_last_error = SCARD.EstablishContext(_scope, IntPtr.Zero, IntPtr.Zero, ref _status_change_context);
if (_last_error != SCARD.S_SUCCESS)
{
_status_change_callback(null, 0, null);
return;
}
uint global_notification_state = SCARD.STATE_UNAWARE;
while (_status_change_running)
{
if (_status_change_context == IntPtr.Zero)
{
_last_error = SCARD.EstablishContext(_scope, IntPtr.Zero, IntPtr.Zero, ref _status_change_context);
if (_last_error != SCARD.S_SUCCESS)
{
_status_change_callback(null, 0, null);
return;
}
}
/* Construct the list of readers we'll have to monitor */
/* --------------------------------------------------- */
bool global_notification_fired = false;
int monitor_count = 0;
if (_auto_update_list)
{
if (_reader_names != null)
{
monitor_count = _reader_names.Length;
if (monitor_count > 10)
{
Trace.WriteLine("PC/SC: not able to monitor more than 10 readers (Windows limitation)");
monitor_count = 10;
}
}
monitor_count += 1;
}
else
{
if (_reader_names == null)
{
SCARD.ReleaseContext(_status_change_context);
_status_change_context = IntPtr.Zero;
_status_change_callback(null, 0, null);
return;
}
monitor_count = _reader_names.Length;
if (monitor_count > 10)
{
Trace.WriteLine("PC/SC: not able to monitor more than 10 readers (Windows limitation)");
monitor_count = 10;
}
}
SCARD.READERSTATE[] states = new SCARD.READERSTATE[monitor_count];
for (int i = 0; i < states.Length; i++)
{
states[i] = new SCARD.READERSTATE();
if (_auto_update_list && (i == 0))
{
/* Magic string to be notified of reader arrival/removal */
states[i].szReader = "\\\\?PNP?\\NOTIFICATION";
states[i].dwCurrentState = global_notification_state;
}
else
{
/* Reader name */
states[i].szReader = _reader_names[i - 1];
states[i].dwCurrentState = SCARD.STATE_UNAWARE;
}
states[i].dwEventState = 0;
states[i].cbAtr = 0;
states[i].rgbAtr = null;
states[i].pvUserData = IntPtr.Zero;
}
/* Now wait for an event */
/* --------------------- */
while (_status_change_running && !global_notification_fired)
{
uint rc = SCARD.GetStatusChange(_status_change_context, 250, states, (uint)states.Length);
if ((rc == SCARD.E_SERVICE_STOPPED) || (rc == SCARD.E_NO_SERVICE))
{
Trace.WriteLine("PC/SC: no service");
SCARD.ReleaseContext(_status_change_context);
_status_change_context = IntPtr.Zero;
continue;
}
if (!_status_change_running)
{
break;
}
if (rc == SCARD.E_TIMEOUT)
{
continue;
}
if (rc != SCARD.S_SUCCESS)
{
Trace.WriteLine("PC/SC: monitor failed with error " + rc);
_last_error = rc;
/* Broadcast a message saying we have a problem! */
for (int i = 0; i < states.Length; i++)
{
states[i].dwEventState = 0 | SCARD.STATE_CHANGED;
}
}
for (int i = 0; i < states.Length; i++)
{
if ((states[i].dwEventState & SCARD.STATE_CHANGED) != 0)
{
/* This reader has fired an event */
/* ------------------------------ */
if (_auto_update_list && (i == 0))
{
/* Not a reader but \\\\?PNP?\\NOTIFICATION */
/* ---------------------------------------- */
Trace.WriteLine("PC/SC: the list of readers has changed");
global_notification_fired = true;
global_notification_state = states[0].dwEventState;
SCARD.ReleaseContext(_status_change_context);
_last_error = SCARD.EstablishContext(_scope, IntPtr.Zero, IntPtr.Zero, ref _status_change_context);
if (_last_error != SCARD.S_SUCCESS)
{
_status_change_callback(null, 0, null);
return;
}
/* Refresh the list of readers */
_reader_names = SCARD.GetReaderList(_status_change_context, _groups);
/* Notify the application that the list of readers has changed */
try
{
_status_change_callback(null, global_notification_state & ~SCARD.STATE_CHANGED, null);
}
catch {}
}
else
{
/* This is a reader */
/* ---------------- */
Trace.WriteLine("PC/SC: status of reader " + states[i].szReader + " has changed");
states[i].dwCurrentState = states[i].dwEventState;
if ((states[i].dwCurrentState & SCARD.STATE_IGNORE) != 0)
{
states[i].dwCurrentState = SCARD.STATE_UNAVAILABLE;
}
CardBuffer card_atr = null;
/* Is there a card involved ? */
if ((states[i].dwEventState & SCARD.STATE_PRESENT) != 0)
{
try
{
card_atr = new CardBuffer(states[i].rgbAtr, (int)states[i].cbAtr);
}
catch {}
}
try
{
_status_change_callback(states[i].szReader, states[i].dwEventState & ~SCARD.STATE_CHANGED, card_atr);
}
catch {}
}
}
}
}
}
SCARD.ReleaseContext(_status_change_context);
_status_change_context = IntPtr.Zero;
}
catch (ThreadInterruptedException) { } /* Hide Interrupt */
}
protected virtual void StatusChangeMonitor()
{
uint rc;
IntPtr hContext = IntPtr.Zero;
_reader_state = SCARD.STATE_UNAWARE;
_card_atr = null;
rc =
SCARD.EstablishContext(_scope, IntPtr.Zero, IntPtr.Zero, ref hContext);
if (rc != SCARD.S_SUCCESS)
{
return;
}
SCARD.READERSTATE[] states = new SCARD.READERSTATE[1];
states[0] = new SCARD.READERSTATE();
states[0].szReader = _reader_name;
states[0].pvUserData = IntPtr.Zero;
states[0].dwCurrentState = 0;
states[0].dwEventState = 0;
states[0].cbAtr = 0;
states[0].rgbAtr = null;
while (_status_change_running)
{
try {
rc = SCARD.GetStatusChange(hContext, 1000, states, 1);
} catch (ThreadInterruptedException) {
break;
}
if (!_status_change_running)
{
break;
}
if (rc == SCARD.E_TIMEOUT)
{
continue;
}
if (rc != SCARD.S_SUCCESS)
{
_last_error = rc;
SCARD.ReleaseContext(hContext);
if (_status_change_callback != null)
{
_status_change_callback(0, null);
}
break;
}
if ((states[0].dwEventState & SCARD.STATE_CHANGED) != 0)
{
states[0].dwCurrentState = states[0].dwEventState;
if (_status_change_callback != null)
{
CardBuffer card_atr = null;
if ((states[0].dwEventState & SCARD.STATE_PRESENT) != 0)
{
card_atr =
new CardBuffer(states[0].rgbAtr, (int)states[0].cbAtr);
}
_status_change_callback(states[0].dwEventState & ~SCARD.
STATE_CHANGED, card_atr);
}
}
}
SCARD.ReleaseContext(hContext);
}