网络字节序 大端小端 IP地址格式转换

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <stdio.h>

 

int main()

{

       int a =0x12345678;

typedef unsigned char uchar;

       uchar *p = (char *)&a;

printf(“%d\n”, *p);

struct in_addr ia;

inet_aton(“172.16.1.35”, &ia);

printf(“%x\n”, ia.s_addr); //ac a0 01 23 => 0x2301a0ac

 

p =(char *)&ia.s_addr;

printf(“%x %x %x %x”, p[0], p[1], p[2], p[3]);

puts(inet_ntoa(ia));

in_addr_t ip = inet_addr(“202.106.0.20”);

 

p =(char *)&ia.s_addr;

printf(“%x %x %x %x”, p[0], p[1], p[2], p[3]);

 

return 0;

}