[C#] How do I read an NFC tag using WinScard.dll

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C#

RFID

Hello

my name is Frederic. For two weeks I've been working on the task to read the tag, and a stored link, of an active NFV TI Chip.

I also have a problem reading the ATR.

My reader is a Springcard H663.

I use the winScard.dll and managed to use SCardEstablishContext() and SCardConnect() sucessfully to get to work, including them as an wrapper.

Now I have issues for a week and nothing is moving forward.

I do not know how to access the tag or the stored Information or which values to give to the function.

[StructLayout(LayoutKind.Sequential)]

public struct SCARD_IO_REQUEST
{
public int dwProtocol;
public int cbPciLength;
}

and

[DllImport("WinScard.dll")]
public static extern int SCardTransmit( IntPtr hCard,
ref SCARD_IO_REQUEST pioSendPci,
ref byte[] pbSendBuffer,
int cbSendLength,
ref SCARD_IO_REQUEST pioRecvPci,
ref byte[] pbRecvBuffer,
ref int pcbRecvLength);

are the implementation of the io structure and the wrapper.

This is the way I tried to access the information:

internal static void _readtag(string readername) {

IntPtr phCard = IntPtr.Zero;
IntPtr activeProtocoll = IntPtr.Zero;

try
{
get_readerconnection(readername, (uint)PROTOCOL_T1 ,phCard, activeProtocoll);// SCardEstablishContext and SCardConnection

int Rueckgabewert;


SCARD_IO_REQUEST ioRequest = new SCARD_IO_REQUEST();
ioRequest.dwProtocol = (int)wrapper.PROTOCOL_T0;
ioRequest.cbPciLength = 8;

byte[] commandBytes = new byte[] { 0xFF, 0xCA, 0x00, 0x00, 0x00 };
byte[] reciveBytes = new byte[10];
int rcvLenght = 0;

Rueckgabewert = SCardTransmit(phCard,ref ioRequest, ref commandBytes,commandBytes.Length, ref ioRequest, ref reciveBytes, ref rcvLenght);

if (Rueckgabewert != 0)
Console.WriteLine("Failed querying tag UID: " + Error_in_String((uint)Rueckgabewert));

Console.WriteLine(Methoden.ByteToString(reciveBytes));

wrapper.SCardDisconnect(phCard, 0);
}

finally
{
wrapper.SCardReleaseContext(phCard);
}

return;

To be complete I show you my ByteToString function:

public static string ByteToString(byte[] ByteArray)
{
ASCIIEncoding ascii = new ASCIIEncoding();
string multi_string = ascii.GetString(ByteArray);
return multi_string;
}

also my get_readerconnection(...) function:

internal static void get_readerconnection(string readername, uint Reader_Protocol ,IntPtr phCard, IntPtr ActiveProtocol )
{
try
{ phCard = IntPtr.Zero;
ActiveProtocol = IntPtr.Zero;
IntPtr hContext = get_hContext();
// using mode =2
// readerprotocol =3
int result = SCardConnect(hContext, readername, 2, Reader_Protocol, ref phCard, ref ActiveProtocol);
Error_in_String((uint)result);
}
catch
{

}
}

My problem is how do I adress the _readertag(..) function for getting the tag, the link or the ATR.And how can I display the result?

I searched the web, but most of the codes are to far advanced for me to understand and msdn does not help me, also the code on code-project is to complicated for me.

I would be very thankful for your help!

Frederic