这个程序的功能用来获得本机的主机名（Hostname）和IP地址。
程序如下：
#include <stdio.h>
#include <winsock.h>
int doit(int rgc,char** rgv)
{
char ac[80];
struct hostent* phe;
struct in_addr addr;
int i;
if(gethostname(ac,sizeof(ac))==SOCKET_ERROR)
{
printf("Error %d when getting local hostname.\n",WSAGetLastError());
return 1;
}
printf("The host name is:%s\n",ac);
phe=gethostbyname(ac);
if(phe==0)
{
printf("Error!Bad host lookup.\n");
return 1;
}
for (i=0;phe->h_addr_list[i]!=0;++i)
{
memcpy(&addr,phe->h_addr_list[i],sizeof(struct in_addr));
printf("Address %d is %s.\n",i,inet_ntoa(addr));
}
return 0;
}
int main(int argc,char* argv[])
{
WSADATA wsaData;
int retval;
if(WSAStartup(MAKEWORD(1,1),&wsaData)!=0)
{
return 255;
}
retval=doit(argc,argv);
WSACleanup();
return retval;
}
