Windows平台：
char* getlocalhostip ()
{
char *ip=NULL;
WORD wVersionRequested;
WSADATA wsaData;
char name[255];
PHOSTENT hostinfo;
wVersionRequested = MAKEWORD(2,0);
if(WSAStartup(wVersionRequested, &wsaData) == 0)
{
if(gethostname(name, sizeof(name)) == 0)
{
if((hostinfo = gethostbyname(name)) != NULL)
{
ip = inet_ntoa(*(struct in_addr *)*hostinfo->h_addr_list);
}
}
WSACleanup();
}
return ip;
}
Linux平台：
char* getlocalhostip ()
{
int MAXINTERFACES=16;
char *ip=NULL;
int fd, intrface;
struct ifreq buf[MAXINTERFACES]; ///if.h
struct ifconf ifc; ///if.h
if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0) //socket.h
{
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl (fd, SIOCGIFCONF, (char *) &ifc)) //ioctl.h
{
intrface = ifc.ifc_len / sizeof (struct ifreq);
while (intrface-->0)
{
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
ip=(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));//types
break;
}
}
}
close (fd);
}
return ip;
}