Linux下C语言实现“域名“转“ip“

原文#include#include#include#include#include#include#include#include#includeint 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[rootwww ble_mesh]# ./a.outhost ip14.215.177.38[rootwww 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));