private void WaitChangeStatus(object sender, DoWorkEventArgs e)
{
while (!e.Cancel)
{
if (context == IntPtr.Zero)
{
return;
}
int result = WinSCard.SCardGetStatusChange(context, 1000, readerStates, readerStates.Length);
for (int i = 0; i < readerStates.Length; i++)
{
// Check if the state changed from the last time.
if ((readerStates[i].dwEventState & (int)WinSCard.CardState.Changed) == (int)WinSCard.CardState.Changed)
{
// Check what changed
WinSCard.CardState state = WinSCard.CardState.None;
if ((readerStates[i].dwEventState & (int)WinSCard.CardState.Present) == (int)WinSCard.CardState.Present &&
(readerStates[i].dwCurrentState & (int)WinSCard.CardState.Present) != (int)WinSCard.CardState.Present)
{
// The card was inserted
state = WinSCard.CardState.Present;
}
else if ((readerStates[i].dwEventState & (int)WinSCard.CardState.Empty) == (int)WinSCard.CardState.Empty &&
(readerStates[i].dwCurrentState & (int)WinSCard.CardState.Empty) != (int)WinSCard.CardState.Empty)
{
// The card was removed
state = WinSCard.CardState.Empty;
}
if (state != WinSCard.CardState.None && readerStates[i].dwCurrentState != (int)WinSCard.CardState.None)
{
switch (state)
{
case WinSCard.CardState.Present:
if (CardInserted != null)
{
Connect(readerStates[i].szReader);
CardInserted(readerStates[i].szReader, ATR);
Disconnect();
}
break;
case WinSCard.CardState.Empty:
if (CardRemoved != null)
{
CardRemoved(readerStates[i].szReader);
}
break;
}
}
// Update the current state for the next time they are checked
readerStates[i].dwCurrentState = readerStates[i].dwEventState;
}
}
}
}
