struct_addr_n_addrIn

struct sockaddr:

//
// Structure used to store most addresses.
//
typedef struct sockaddr {

#if (_WIN32_WINNT < 0x0600)
    u_short sa_family;
#else 
    ADDRESS_FAMILY sa_family;           // Address family.
#endif //(_WIN32_WINNT < 0x0600)

    CHAR sa_data[14];                   // Up to 14 bytes of direct address.
} SOCKADDR, *PSOCKADDR, FAR *LPSOCKADDR;

struct sockaddr_in:

//
// IPv4 Socket address, Internet style
//

typedef struct sockaddr_in {

#if(_WIN32_WINNT < 0x0600)
    short   sin_family;    
#else //(_WIN32_WINNT < 0x0600)
    ADDRESS_FAMILY sin_family;
#endif //(_WIN32_WINNT < 0x0600)

    USHORT sin_port;
    IN_ADDR sin_addr;
    CHAR sin_zero[8];
} SOCKADDR_IN, *PSOCKADDR_IN;