//Make the constructor private to hide it. This class adheres to the singleton pattern.
private SmartcardManager()
{
//Create a new SafeHandle to store the smartcard context.
this._context = new SmartcardContextSafeHandle();
//Establish a context with the PC/SC resource manager.
this.EstablishContext();
//Compose a list of the card readers which are connected to the
//system and which will be monitored.
ArrayList availableReaders = this.ListReaders();
this._states = new ReaderState[availableReaders.Count];
for (int i = 0; i <= availableReaders.Count - 1; i++)
{
this._states[i].Reader = availableReaders[i].ToString();
}
//Start a background worker thread which monitors the specified
//card readers.
if ((availableReaders.Count > 0))
{
this._worker = new BackgroundWorker();
this._worker.WorkerSupportsCancellation = true;
this._worker.DoWork += WaitChangeStatus;
this._worker.RunWorkerAsync();
}
}
static internal extern uint ListReaders(SmartcardContextSafeHandle context, string groups,
string readers, ref int size);
static internal extern uint GetStatusChange([In(), Out()] SmartcardContextSafeHandle context,
[In(), Out()] int timeout, [In(), Out()] ReaderState[] states, [In(), Out()] int count);
static internal extern uint EstablishContext(ScopeOption scope, IntPtr reserved1,
IntPtr reserved2, ref SmartcardContextSafeHandle context);