请问如何在pc端获取USB读卡器里SD卡的CID 信息？？？用VC++的。

void GetSD_CID()

{

  // TODO: Add your control notification handler code here

  //CComboBoxEx * pComBox = (CComboBoxEx *) GetDlgItem(IDC_COMBO1);

  TCHAR StrDeviceName[64] = {0};

  wsprintf(StrDeviceName,_T("\\\\.\\%C:"),'G'/*pComBox->GetCurSel()*/);

  // Create device handle

  HANDLE hVol = CreateFile(StrDeviceName,

    GENERIC_READ|GENERIC_WRITE,                // no access to the drive

    FILE_SHARE_READ | // share mode

    FILE_SHARE_WRITE,

    NULL,             // default security attributes

    OPEN_EXISTING,    // disposition

    0,                // file attributes

    NULL);            // do not copy file attributes

  //CString strOutputMsg;

  UCHAR ucSDCID[SD_CID_LENGTH] = {0};

  if(INVALID_HANDLE_VALUE != hVol && NULL != hVol){

    // Structure used in IOCTL_SFFDISK_DEVICE_COMMAND

    // The layout of the buffer passed to this IOCTL is as follows:

    //

    //        +-----------------------------+

    //        | header (this structure)     |

    //        +-----------------------------+

    //        | protocol arguments          |

    //        +-----------------------------+

    //        | device data buffer          |

    //        +-----------------------------+

    //

    // The actual layout of the protocol arguments depends on the protocol of

    // the target device. So as an example, if the target device an SD (Secure Digital)

    // storage device, then the protocol arguments would consist of an SDCMD_DESCRIPTOR,

    // which is defined in SDDEF.H. The SD argument for the command should be stored

    // in the "Information" field of this structure. In that case, ProtocolArgumentSize

    // would be sizeof(SDCMD_DESCRIPTOR).

    //

    // The three size fields in the structure (HeaderSize, ProtocolArgumentSize,

    // DeviceDataBufferSize) each hold the length in bytes of each respective area as

    // described by the diagram above. Thus, the entire length of the buffer must be

    // at least as large as the sum of these three fields.

    //

    int nSizeOfCmd = sizeof(SFFDISK_DEVICE_COMMAND_DATA) + sizeof(SDCMD_DESCRIPTOR) + SD_CID_LENGTH;

    SFFDISK_DEVICE_COMMAND_DATA *pCmdBuf = (SFFDISK_DEVICE_COMMAND_DATA*) new BYTE[nSizeOfCmd];

        SFFDISK_DEVICE_COMMAND_DATA *pCmdBufout = (SFFDISK_DEVICE_COMMAND_DATA*) new BYTE[nSizeOfCmd];

    ULONG_PTR info = 0;

    memset(pCmdBuf, 0, nSizeOfCmd);       

    pCmdBuf->HeaderSize = sizeof (SFFDISK_DEVICE_COMMAND_DATA);

    pCmdBuf->Command = SFFDISK_DC_DEVICE_COMMAND;

    pCmdBuf->ProtocolArgumentSize = sizeof (SDCMD_DESCRIPTOR);

    pCmdBuf->DeviceDataBufferSize = SD_CID_LENGTH;

    pCmdBuf->Information = info;

    ///Command protocol

    SDCMD_DESCRIPTOR sdCmdDescriptor = { 0 };

    sdCmdDescriptor.Cmd = SFFDISK_SC_GET_CARD_VERSION;   // Issue CMD10 to driver

    sdCmdDescriptor.CmdClass = SDCC_STANDARD;

    sdCmdDescriptor.TransferDirection = SDTD_READ;

    sdCmdDescriptor.TransferType = SDTT_CMD_ONLY;

    sdCmdDescriptor.ResponseType = SDRT_1;       

/*    memcpy((BYTE *)(&(pCmdBuf->Data[0])), &sdCmdDescriptor, sizeof(SDCMD_DESCRIPTOR));   */    

    memcpy(pCmdBuf->Data, &sdCmdDescriptor, sizeof(SDCMD_DESCRIPTOR));   

    DWORD dwBytesReturned = 0;

    BOOL bResult = DeviceIoControl(hVol,

      IOCTL_SFFDISK_DEVICE_COMMAND,

      pCmdBuf,

      nSizeOfCmd,

      pCmdBufout,

      nSizeOfCmd,

      &dwBytesReturned,

      NULL);       

    DWORD dwErr = GetLastError();

    CloseHandle(hVol);

    int nCIDBaseIndex = sizeof(SDCMD_DESCRIPTOR);

    if(!bResult){

      printf("Failed to get CID, err code is |%d|",dwErr);

    }else{

    }

    ////////////////////////////////////////////////////////////////

    delete [] pCmdBuf;

  }else{

    //strOutputMsg.Format(L"Failed to open device handle |%s|", StrDeviceName);

  }

}