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char *dest = "www.baidu.com";
struct hostent *ht=NULL;
ht = gethostbyname(dest);
unsigned int ip = *(unsigned long *)ht->h_addr_list[0];
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = ip;
server_addr.sin_port = 80;
if(connect(s,(struct sockaddr*)&server_addr,sizeof(struct sockaddr))){
perror("connect");
exit(1);
}
LPTSTR s = "192.168.0.1";//"www.baidu.com"
sockaddr_in6 sin6;
sockaddr_in sin4;
int slen;
slen = sizeof(sin6);
if (WSAStringToAddress(s, AF_INET6, 0, (sockaddr *)&sin6, &slen) == 0) {
//ipv6 的地址
} else {
slen = sizeof(sin4);
if (WSAStringToAddress((PTSTR)s, AF_INET, 0, (sockaddr *)&sin4, &slen) == 0) {
//ipv4的地址
} else {
//如果给出的是域名, 上面调用会失败
addrinfo hints={}, *res=NULL;
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = AF_INET;
char* p = 0;
#ifdef UNICODE
p = ConvertToMBCS(s);
#else
p = s;
#endif
if (getaddrinfo(p, NULL, &hints, &res) == 0) {
//ipv4 地址获取成功
freeaddrinfo(res);
} else {
hints.ai_family = AF_INET6;
if (getaddrinfo(p, NULL, &hints, &res) == 0) {
//ipv6
freeaddrinfo(res);
}
}
}
}
#include <stdio.h>
int main() {
int IP[4];
int i;
char c;
printf("请输入一个ip地址:");fflush(stdout);
while (1) {
rewind(stdin);
if (5==scanf("%d.%d.%d.%d%c",&IP[0],&IP[1],&IP[2],&IP[3],&c)) {
if (0<=IP[0] && IP[0]<=255
&& 0<=IP[1] && IP[1]<=255
&& 0<=IP[2] && IP[2]<=255
&& 0<=IP[3] && IP[3]<=255
&& '\n'==c) {
break;
} else printf("输入的ip地址格式不对!\n请重新输入:\n");
} else printf("输入的ip地址格式不对!\n请重新输入:\n");
}
for (i=0;i<4;i++) {
printf("IP[%d]=%d\n",i,IP[i]);
}
return 0;
}
再供参考:#include <stdio.h>
char s[]="123 ab 4";
char *p;
int v,n,k;
void main() {
p=s;
while (1) {
k=sscanf(p,"%d%n",&v,&n);
printf("k,v,n=%d,%d,%d\n",k,v,n);
if (1==k) {
p+=n;
} else if (0==k) {
printf("skip char[%c]\n",p[0]);
p++;
} else {//EOF==k
break;
}
}
printf("End.\n");
}
//k,v,n=1,123,3
//k,v,n=0,123,3
//skip char[ ]
//k,v,n=0,123,3
//skip char[a]
//k,v,n=0,123,3
//skip char[b]
//k,v,n=1,4,2
//k,v,n=-1,4,2
//End.