c语言取非,C语言 获取本机IP地址，非回环地址

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define ETH_NAME "eth1" /*这个是网卡的标识符*/

int main()

{

int sock;

struct sockaddr_in sin;

struct ifreq ifr;

sock = socket(AF_INET, SOCK_DGRAM, 0);

if (sock == -1)

{

perror("socket");

return -1;

}

strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);

ifr.ifr_name[IFNAMSIZ - 1] = 0;

if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)

{

perror("ioctl");

return -1;

}

memcpy(&sin, &ifr.ifr_addr, sizeof(sin));

fprintf(stdout, "eth0: %s/n", inet_ntoa(sin.sin_addr));

return 0;

}

运行过程中有可能会报错：

ioctl: Cannot assign requested address

或者no device

说明网卡的标识符不对，找出网卡的标识符比如为eth2，改eth1为eth2即可