/// <summary>
/// Raise tag lost event
/// </summary>
/// <param name="nfcTagType">NFC tag type</param>
/// <param name="conn">Connection instance to NFC tag</param>
private void OnTagLost(NfcTagType nfcTagType, NfcTagConnection conn)
{
TagLost?.Invoke(this, new NfcTagEventArgs(nfcTagType, conn));
}
protected void Poller()
{
SCW.SCARD_READERSTATE[] State = new SCW.SCARD_READERSTATE[1];
State[0].RdrName = this.Name;
State[0].UserData = IntPtr.Zero;
State[0].RdrCurrState = SCW.SCARD_STATE_UNKNOWN;
int retCode;
retCode = SCW.SCardGetStatusChange(hContext, 100, State, 1);
if (retCode != SCW.SCARD_S_SUCCESS)
{
throw new Exception("Failed initial get status change: " + SCW.GetScardErrMsg(retCode));
}
State[0].RdrCurrState = State[0].RdrEventState;
while (!stopPollingSignal)
{
retCode = SCW.SCardGetStatusChange(hContext, 1000, State, 1);
if (retCode == SCW.SCARD_E_TIMEOUT)
{
continue;
}
if (retCode != SCW.SCARD_S_SUCCESS)
{
throw new Exception("Failed cycling get status change: " + SCW.GetScardErrMsg(retCode));
}
if (((State[0].RdrEventState & SCW.SCARD_STATE_PRESENT) == SCW.SCARD_STATE_PRESENT) &&
((State[0].RdrEventState & SCW.SCARD_STATE_CHANGED) == SCW.SCARD_STATE_CHANGED))
{
try {
NFCTag tag = Connect();
foreach (Delegate d in TagFound.GetInvocationList())
{
ISynchronizeInvoke syncer = d.Target as ISynchronizeInvoke;
if (syncer != null)
{
syncer.BeginInvoke(d, new NFCTag[] { tag });
}
else
{
d.DynamicInvoke(tag);
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Connect failed:" + ex.ToString());
}
}
else if (((State[0].RdrEventState & SCW.SCARD_STATE_EMPTY) == SCW.SCARD_STATE_EMPTY) &&
((State[0].RdrEventState & SCW.SCARD_STATE_CHANGED) == SCW.SCARD_STATE_CHANGED))
{
foreach (Delegate d in TagLost.GetInvocationList())
{
ISynchronizeInvoke syncer = d.Target as ISynchronizeInvoke;
if (syncer != null)
{
syncer.BeginInvoke(d, null);
}
else
{
d.DynamicInvoke();
}
}
}
State[0].RdrCurrState = State[0].RdrEventState;
}
}
