Linux下C语言实现“域名“转“ip“

原文
#include
#include
#include
#include
#include
#include
#include
#include
#include

int main(int argc, char** argv)
{
assert(argc == 2);
const char* hostname = argv[1];
struct hostent* host;

host = gethostbyname(hostname); if (NULL == host) { perror("can not get host by hostname"); exit(EXIT_FAILURE); } printf("host ip=%s\n", inet_ntoa(*((struct in_addr*)host->h_addr))); return EXIT_SUCCESS;

}

本人在centos6平台验证
[root@www ble_mesh]# ./a.out
host ip=14.215.177.38
[root@www ble_mesh]#
另外加入：
#define SOCKADDR_IN(addr, ip, port) do{
memset(&(addr), 0, sizeof(addr));
(addr).sin_family = AF_INET;
(addr).sin_addr.s_addr = inet_addr(ip);
(addr).sin_port = htons(port);
if ((addr).sin_addr.s_addr == INADDR_NONE){
struct hostent* pHost = gethostbyname(ip);
if (pHost == NULL){return ;}
memcpy(&(addr).sin_addr, pHost->h_addr_list[0], pHost->h_length);}
}while(0)

struct sockaddr_in servaddr; SOCKADDR_IN(servaddr,"", 5000); //SOCKADDR_IN(servaddr,"192.168.0.11", 5000); printf("baidu%s\n",inet_ntoa(servaddr.sin_addr));