根据域名解析对应IP
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
int lookup_host (const char *host)
{
struct addrinfo hints, *res;
int errcode;
char addrstr[100];
void *ptr;
memset (&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags |= AI_CANONNAME;
errcode = getaddrinfo (host, NULL, &hints, &res);
if (errcode != 0)
{
perror ("getaddrinfo");
return -1;
}
printf ("Host: %s\n", host);
while (res)
{
inet_ntop (res->ai_family, res->ai_addr->sa_data, addrstr, 100);
//先判断IPV4 再IPV6
switch (res->ai_family)
{
case AF_INET:
ptr = &((struct sockaddr_in *) res->ai_addr)->sin_addr;
break;
case AF_INET6:
ptr = &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
break;
}
inet_ntop (res->ai_family, ptr, addrstr, 100);
printf ("IPv%d address: %s (%s)\n", res->ai_family == PF_INET6 ? 6 : 4,
addrstr, res->ai_canonname);
res = res->ai_next;
}
return 0;
}
NSDate *startDate =[NSDate date];
int re= lookup_host("www.baidu.com");
//查看下解析时间
NSDate *endDate =[NSDate date];
NSTimeInterval time = [endDate timeIntervalSinceDate:startDate];
NSLog(@"-->%lf",time);
测试结果.png
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