ISO 15693: SCardReconnect fails even though SCardConnect and SCardTransmit succeed (C#)

Question

I am trying to implement code that will perform an SCardReconnect for certain error conditions when trying to read a TI Tag-IT RFID card with an HID 5321 smart card reader. In the event of a transmit error, I try a reconnect and retry the operation. However, when I perform the reconnect, I get a return value of 6 (INVALID HANDLE). Here is the code for the call for a working SCardConnect, and the non working SCardReconnect.

int iRetval = HID.SCardConnect(
                    m_hContext,
                    m_sReaderName,
                    HiDWinscard.SCARD_SHARE_SHARED,
                    HiDWinscard.SCARD_PROTOCOL_T1,
                    ref m_hCard,
                    ref m_protocol);

int iRetval = HID.SCardReconnect(ref m_hCard,
                                      HiDWinscard.SCARD_SHARE_SHARED,
                                      HiDWinscard.SCARD_PROTOCOL_T1,
                                      0,  //Leave card alone SCARD_LEAVE_CARD
                                      ref m_protocol);

Where m_hCard and m_protocol are the same (IntPtr).

The following SCardTransmit works as well, and it uses the same reference to m_hCard

iRetval = HID.SCardTransmit(m_hCard, ref sioreq, 
                            sendBuffer, sendbufferlen, 
                            ref rioreq, receiveBuffer, 
                            ref receivebufferlen);

This is quite a pressing matter. Does anyone happen to have an idea of what may be going on? I thank everyone in advance for their help!

Answer 1

On a first quess, I would assume that you should not pass m_hCard as reference. Also I would reconnect using the protocol received from the initial connect as prefered protocol:

int iRetval = HID.SCardReconnect(m_hCard,
                                 HiDWinscard.SCARD_SHARE_SHARED,
                                 m_protocol,
                                 0,  //Leave card alone SCARD_LEAVE_CARD
                                 ref m_protocol);