64位网络字节序与主机字节序转换

unsigned long long ntohll(unsigned long long val)  {     if (__BYTE_ORDER == __LITTLE_ENDIAN)      {         return (((unsigned long long )htonl((int)((val << 32) >> 32))) << 32) | (unsigned int)htonl((int)(val >> 32));     }     else if (__BYTE_ORDER == __BIG_ENDIAN)      {         return val;     } }  unsigned long long htonll(unsigned long long val)  {     if (__BYTE_ORDER == __LITTLE_ENDIAN)      {         return (((unsigned long long )htonl((int)((val << 32) >> 32))) << 32) | (unsigned int)htonl((int)(val >> 32));     }     else if (__BYTE_ORDER == __BIG_ENDIAN)      {         return val;     } }

来源：http://www.2cto.com/kf/201206/136762.html