private void WaitChangeStatus(object sender, DoWorkEventArgs e)
{
while (!e.Cancel)
{
SmartCardErrors result;
// Obtain a lock when we use the context pointer, which may be modified in the Dispose() method.
lock (this) {
if (context == IntPtr.Zero)
{
return;
}
// This thread will be executed every 1000ms. The thread also blocks for 1000ms, meaning that the application
// may keep on running for one extra second after the user has closed the Main Form.
result = GetStatusChange(context, 1000, states, readers.Count);
}
if (result == SmartCardErrors.SCARD_E_TIMEOUT)
{
// Time out has passed, but there is no new info. Just go on with the loop
continue;
}
CheckResult(result);
for (int i = 0; i < states.Length; i++)
{
// Check if the state changed from the last time
if ((states[i].EventState & CardState.Changed) == CardState.Changed)
{
// Check what changed.
SmartCardState state = SmartCardState.None;
if ((states[i].EventState & CardState.Present) == CardState.Present &&
(states[i].CurrentState & CardState.Present) != CardState.Present)
{
// The card was inserted.
state = SmartCardState.Inserted;
}
else if ((states[i].EventState & CardState.Empty) == CardState.Empty &&
(states[i].CurrentState & CardState.Empty) != CardState.Empty)
{
// The card was ejected.
state = SmartCardState.Ejected;
}
if (state != SmartCardState.None && states[i].CurrentState != CardState.Unaware)
{
// Raise an event to indicate the change, if we weren't previously unaware of the state
// This prevents from the event being raised the first time.
this.OnStateChanged(
new SmartCardStateChangedEventArgs(
states[i].Reader, state, states[i].rgbAtr));
}
// Update the current state
// for the next time they are checked.
states[i].CurrentState = states[i].EventState;
}
}
}
}
public void WaitForState(SmartCardState state, int timeout)
{
SmartCardState retState;
int ret = MCardWaitForCardState(context, state, out retState, (uint)timeout);
if (ret != 0)
{
throw new Exception(ret.ToString("X"));
}
}
public void WaitForStatusChange(string reader, SmartCardState currentState, SmartCardState newState, long timeout)
{
if ((timeout < 0) || (timeout > uint.MaxValue))
{
throw new ArgumentOutOfRangeException("timeout must be a 32-bit unsigned integer value");
}
ReaderState readerState = new ReaderState();
readerState.Reader = reader;
readerState.UserData = IntPtr.Zero;
readerState.CurrentState = currentState;
readerState.EventState = newState;
readerState.AtrLength = 0;
int ret = SCardGetStatusChange(context, (uint)timeout, ref readerState, 1);
if (ret != 0)
{
throw ToException(ret);
}
}
private static extern int MCardWaitForCardState(IntPtr context, SmartCardState expectedCardState, out SmartCardState cardState, uint timeout);
public void WaitForState(SmartCardState state, int timeout) {
SmartCardState retState;
int ret = MCardWaitForCardState(context, state, out retState, (uint)timeout);
if (ret != 0)
throw new Exception(ret.ToString("X"));
}
private static extern int MCardWaitForCardState(IntPtr context, SmartCardState expectedCardState, out SmartCardState cardState, uint timeout);
private static extern int SCardGetStatus(IntPtr card, IntPtr readerName, ref uint readerLength, out SmartCardState state, out SmartCardProtocols protocol, IntPtr atr, out uint atrLength);
public SmartCardStateChangedEventArgs(string reader, SmartCardState state, byte[] atr)
{
this.reader = reader;
this.state = state;
this.atr = atr;
}
public void WaitForStatusChange(string reader, SmartCardState currentState, SmartCardState newState)
{
WaitForStatusChange(reader, currentState, newState, uint.MaxValue);
}
private static extern int SCardGetStatus(IntPtr card, IntPtr readerName, ref uint readerLength, out SmartCardState state, out SmartCardProtocols protocol, IntPtr atr, out uint atrLength);
public SmartCardStateChangedEventArgs(string reader, SmartCardState state, byte[] atr) {
this.reader = reader;
this.state = state;
this.atr = atr;
}
public void WaitForStatusChange(string reader, SmartCardState currentState, SmartCardState newState, long timeout) {
if ((timeout < 0) || (timeout > uint.MaxValue))
throw new ArgumentOutOfRangeException("timeout must be a 32-bit unsigned integer value");
ReaderState readerState = new ReaderState();
readerState.Reader = reader;
readerState.UserData = IntPtr.Zero;
readerState.CurrentState = currentState;
readerState.EventState = newState;
readerState.AtrLength = 0;
int ret = SCardGetStatusChange(context, (uint)timeout, ref readerState, 1);
if (ret != 0)
throw ToException(ret);
}
public void WaitForStatusChange(string reader, SmartCardState currentState, SmartCardState newState) {
WaitForStatusChange(reader, currentState, newState, uint.MaxValue);
}
