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SCardGetStatusChange (winscard)
.
C# Signature:
/// <summary>
/// The SCardGetStatusChange function blocks execution until the current availability of the cards in a specific set of readers changes.
/// </summary>
/// <param name="hContext">A handle that identifies the resource manager context. The resource manager context is set by a previous call to the SCardEstablishContext function.</param>
/// <param name="dwTimeout">The maximum amount of time, in milliseconds, to wait for an action. A value of zero causes the function to return immediately. A value of INFINITE causes this function never to time out.</param>
/// <param name="rgReaderStates">An array of SCARD_READERSTATE structures that specify the readers to watch, and that receives the result.</param>
/// <param name="cReaders">the number of elements in the rgReaderStates array.</param>
/// <returns>This function returns different values depending on whether it succeeds or fails</returns>
[DllImport("winscard.dll", CharSet=CharSet.Auto)]
static extern SCardFunctionReturnCodes SCardGetStatusChange(int hContext, int dwTimeout, [In, Out] SCARD_READERSTATE[] rgReaderStates, int cReaders);
static extern int SCardGetStatusChange(int hContext, int dwTimeout, [In, Out] SCARD_READERSTATE[] rgReaderStates, int cReaders);
private const int SCARD_STATE_UNAWARE = 0x00000000;
// get ATR of card
// hContext - previously established context
// reader - ATR will be read from card in this reader
private static byte[] atr(int hContext, string reader)
{
int ret;
byte[] atr = null;
SCARD_READERSTATE[] rs = new SCARD_READERSTATE[1];
rs[0].szReader = reader;
rs[0].dwCurrentState = SCARD_STATE_UNAWARE;
Tips & Tricks:
Please add some!
ret = SCardGetStatusChange(hContext, 100, rs, 1);
if (ret == 0 && rs[0].cbAtr > 0 && rs[0].rgbAtr != null)
{
atr = new byte[rs[0].cbAtr];
Array.Copy(rs[0].rgbAtr, atr, rs[0].cbAtr);
}
return atr;
}
Sample Code:
private const int SCARD_STATE_UNAWARE = 0x00000000;
// get ATR of card
// hContext - previously established context
// reader - ATR will be read from card in this reader
private static byte[] atr(int hContext, string reader)
{
int ret;
byte[] atr = null;
SCARD_READERSTATE[] rs = new SCARD_READERSTATE[1];
rs[0].szReader = reader;
rs[0].dwCurrentState = SCARD_STATE_UNAWARE;
Alternative Managed API:
TODO
ret = SCardGetStatusChange(hContext, 100, rs, 1);
if (ret == 0 && rs[0].cbAtr > 0 && rs[0].rgbAtr != null)
{
atr = new byte[rs[0].cbAtr];
Array.Copy(rs[0].rgbAtr, atr, rs[0].cbAtr);
}
return atr;
}
Alternative Managed API:
TODO
The SCardGetStatusChange function blocks execution until the current availability of the cards in a specific set of readers changes.
12/18/2012 1:16:42 PM - -173.167.132.185
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