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        ERROR_RECV_BUF_FULL,

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        public const int BadControlRecv = 2193;

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        /// Returned by WSARecv or WSARecvFrom to indicate the remote party has initiated a graceful shutdown sequence.

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    short frmr_recv;

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    short iframe_recv_err;

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    int recv_success;

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    short recv_buff_unavail;

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   Dim frmr_recv As Short

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   Dim iframe_recv_err As Short

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   Dim recv_success As Integer

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   Dim recv_buff_unavail As Short

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   WORD    frmr_recv;

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   WORD    iframe_recv_err;

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   DWORD   recv_success;

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   WORD    recv_buff_unavail;

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        //BufferRet = Native.recv(socketPtr, BufferPtr, Buffer, Native.MsgFlags.MSG_PEEK);

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        /// partial send or recv for message xport

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    public static extern int recvfrom(IntPtr Socket, IntPtr buf, int len, SendDataFlags flags, ref SockAddr from, IntPtr fromlen);

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    public static int recvfrom(IntPtr Socket, IntPtr buf, int len, SendDataFlags flags, ref SockAddr from)

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        return recvfrom(Socket, buf, len, flags, ref from, IntPtr.Zero);

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Declare Function RecvFrom Lib "ws2_32.dll" (TODO) As TODO

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Documentation

[RecvFrom] on MSDN

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        IP_RECVIF           =   24,

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        IP_RECVDSTADDR          =   25,

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        IP_RECVRTHDR        =   38,

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        IP_RECVTCLASS           =   40,

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        IPV6_RECVIF         =   24,

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        IPV6_RECVDSTADDR        =   25,

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        IPV6_RECVRTHDR          =   38,

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        IPV6_RECVTCLASS         =   40,

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        //BufferRet = Native.recv(socketPtr, BufferPtr, Buffer, Native.MsgFlags.MSG_PEEK);

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     ref SCARD_IO_REQUEST pioRecvRequest,

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     out byte RecvBuff,

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     ref UInt32 RecvBuffLen

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If you use a struct rather than a class for SCARD_IO_REQUEST, don't forget to add "ref" to the pioRecvPci parameter in the signature. Alternatively, if you don't care about the returned protocol control information, change the pioRecvPci parameter to an "IntPtr" and pass "IntPtr.Zero" in as this parameter

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SCARD_IO_REQUEST ioRecv = new SCARD_IO_REQUEST();

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byte[] pbRecvBuffer=new byte [255];

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int pcbRecvLength=255;

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ioRecv.cbPciLength = 255;

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uint errors=SCardTransmit(nCard, SCARD_PCI_T0, pbSendBuffer, cbSendLength, ioRecv, pbRecvBuffer, ref pcbRecvLength);

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