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用下面的函数可以直接找到你的ip地址
- #include <stdio.h>;
- #include <sys/types.h>;
- #include <sys/socket.h>;
- #include <sys/ioctl.h>;
- #include <netinet/in.h>;
- #include <net/if.h>;
- #include <net/if_arp.h>;
- #include <arpa/inet.h>;
- #include <errno.h>;
- #define ETH_NAME "eth0"
- 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;
- }
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