gethostname(); gethostbyname(); gethostbyaddr() 的用法

来源：互联网发布：sony投影仪网络连接编辑：程序博客网时间：2024/04/28 02:23

#include <winsock2.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32")

int main()
{
WSADATA wSdata;
if (WSAStartup(MAKEWORD(2,2), &wSdata)!=0)
{
  printf("WSAStartup() error %d", GetLastError());
  WSACleanup();
  system("pause");
  return -1;
}
char hname[100]={0};
char buff[20]={0};
struct in_addr addr;

gethostname(hname, sizeof(hname));   //获得主机名
printf("hostname: %s/n", hname);
//
printf("*************/n");
hostent *p=gethostbyname(hname);
printf("p->h_name:%s/n", p->h_name);
printf("p->h_length:%d/n", p->h_length);
printf("p->h_addrtype:%d/n", p->h_addrtype);
printf("p->h_aliases[0]:%s/n", p->h_aliases[0]);

int i=0;
while(p->h_addr_list[i])
{
  addr.S_un.S_addr = *(unsigned long *)p->h_addr_list[i];
  printf("p->h_addr_list[%d]:%s/n",i , inet_ntoa(addr));
  i++;

}

i=0;
while(p->h_aliases[i])
{

  printf("p->h_aliases[%d]:%s/n",i ,p->h_aliases[i]);
  i++;

}
printf("*************/n");
//gethostbyaddr()
in_addr addrss;
addrss.S_un.S_addr = inet_addr("127.0.0.1");
p = gethostbyaddr((char *)&addrss, sizeof(in_addr), AF_INET);
printf("p->h_name:%s/n", p->h_name);
printf("p->h_length:%d/n", p->h_length);
printf("p->h_addrtype:%d/n", p->h_addrtype);
printf("p->h_aliases[0]:%s/n", p->h_aliases[0]);
i=0;
while(p->h_addr_list[i])
{
  addr.S_un.S_addr = *(unsigned long *)p->h_addr_list[i];
  printf("p->h_addr_list[%d]:%s/n",i , inet_ntoa(addr));
  i++;

}

//
printf("*************/n");
p=gethostbyname("www.baidu.com");
printf("p->h_name:%s/n", p->h_name);
printf("p->h_length:%d/n", p->h_length);
printf("p->h_addrtype:%d/n", p->h_addrtype);
printf("p->h_aliases[0]:%s/n", p->h_aliases[0]);
i=0;
while(p->h_addr_list[i])
{
  addr.S_un.S_addr = *(unsigned long *)p->h_addr_list[i];
  printf("p->h_addr_list[%d]:%s/n",i ,inet_ntoa(addr));
  i++;

}
i=0;
while(p->h_aliases[i])
{

  printf("p->h_aliases[%d]:%s/n",i ,p->h_aliases[i]);
  i++;

}
system("pause");
WSACleanup();
return 0;

}