linux下编程获得本机IP地址

#include <sys/socket.h>#include <unistd.h>#include <sys/ioctl.h>#include <string>#include <stdio.h>#include <arpa/inet.h>#include <net/if.h>#include <netinet/in.h>using namespace std;const char* const ETH = "eth0";int  GetIP2(string &ip){int socket_fd;struct sockaddr_in *sin;struct ifreq ifr;struct ifconf;socket_fd = socket(AF_INET,SOCK_DGRAM,0); if(socket_fd ==-1){perror("socket error!\n");return -1;}strcpy(ifr.ifr_name,ETH);//这里要特别的注意，根据自己的系统的不同会有所差异有可能会是“eth0“。 如果出现错误提示 No such device 可能是这里的问题if(ioctl(socket_fd,SIOCGIFADDR,&ifr) < 0){perror("ioctl error\n");close(socket_fd);return -1;}else{sin = (struct sockaddr_in *)&(ifr.ifr_addr);ip = inet_ntoa(sin->sin_addr);}close(socket_fd);return 0;}int main(){string  ip;string  os;#ifdef WIN32os = "WIN7";#elseos = "CentOs";#endif GetIP2(ip);printf("current ip is : %s\n", ip.c_str());printf("current os is : %s\n", os.c_str());return 0;}