C# Signature:

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

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

One may Get the SCARD_IO_REQUEST values which are defined as pointer to initialised data export in WinSCard.dll using the LoadLibrary and GetProcAddress pair.

Sample Code:

// Paste here code for SCardEstablishContext, SCardConnect

[StructLayout(LayoutKind.Sequential)]
internal class SCARD_IO_REQUEST
   {
    internal uint dwProtocol;
    internal int cbPciLength;
    public SCARD_IO_REQUEST()
      {
    dwProtocol = 0;
      }
   }

[DllImport("kernel32.dll")]
private extern static IntPtr LoadLibrary(string lpFileName);

[DllImport("kernel32.dll")]
private extern static void FreeLibrary(IntPtr handle) ;

[DllImport("kernel32.dll")]
private extern static IntPtr GetProcAddress(IntPtr handle, string
procName);

//Get the address of Pci from "Winscard.dll".
private static IntPtr GetPciT0()
{
IntPtr handle = LoadLibrary("Winscard.dll") ;
IntPtr pci = GetProcAddress(handle, "g_rgSCardT0Pci") ;
FreeLibrary(handle) ;
return pci ;
}

SCARD_IO_REQUEST ioRecv = new SCARD_IO_REQUEST();
byte[] pbRecvBuffer=new byte [255];
int pcbRecvLength=255;
byte[] pbSendBuffer = { 0xC0, 0xA4, 0x00, 0x00, 0x02, 0x3F, 0x00 }; // Example Cla,Ins,P1,P2,P3,DataIN (Select MF)
int cbSendLength=pbSendBuffer.Length;
ioRecv.cbPciLength = 255;
IntPtr SCARD_PCI_T0 = PCSC.GetPciT0();
uint errors=SCardTransmit(nCard, SCARD_PCI_T0, pbSendBuffer, cbSendLength, ioRecv, pbRecvBuffer, ref pcbRecvLength);

// Paste here code for SCardDisconnect, pbRecvBuffer contains Answer as Byte[]

Alternative Managed API:

TODO