获取当前操作系统的ip

#include "stdafx.h"
#include <WinSock2.h>


int get_local_ip() {
    WSADATA wsaData;
    if(WSAStartup(MAKEWORD(2,2),&wsaData))
    {
        return -1;
    }
    char hostname[128];
    int ret = gethostname(hostname, sizeof(hostname));
    if (ret == -1) {
        return -1;
    }
    struct hostent *hent;
    hent = gethostbyname(hostname);
    if (NULL == hent) {
        return -1;
    }
    //直接取h_addr_list列表中的第一个地址h_addr
    char ip[128];
    sprintf_s(ip, "%s", inet_ntoa(*((struct in_addr *)hent->h_addr)));
    printf("%s\n", ip);
    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    get_local_ip();
    system( "PAUSE "); 
	return 0;
}