linux获得本地IP
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/types.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <iostream>
using namespace std;
//获取地址
//返回IP地址字符串
//返回:0=成功,-1=失败
int getlocalip(char* outip)
{
int i = 0;
int sockfd;
struct ifconf ifconf;
char buf[512];
struct ifreq *ifreq;
char* ip;
//初始化ifconf
ifconf.ifc_len = 512;
ifconf.ifc_buf = buf;
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
return -1;
}
ioctl(sockfd, SIOCGIFCONF, &ifconf); //获取所有接口信息
close(sockfd);
//接下来一个一个的获取IP地址
ifreq = (struct ifreq*) buf;
for (i = (ifconf.ifc_len / sizeof(struct ifreq)); i > 0; i--)
{
ip = inet_ntoa(((struct sockaddr_in*) &(ifreq->ifr_addr))->sin_addr);
if (strcmp(ip, "127.0.0.1") == 0)
{
ifreq++;
continue;
}
strcpy(outip, ip);
return 0;
}
return -1;
}
//——————————-函数的调用方式————————————-
int main(int argc, char** argv)
{
char ip[20];
if(getlocalip(ip)==0)
{
cout << "本机IP地址是:" << ip;
}
else
{
cout << "无法获得本地IP地址" << endl;
}
getchar();
return 0;
}