A "hello world" program has become the traditional first program that many people learn. Here’s i’ll show you how to print "Hello World" in A web page.
Using HTML
<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN"> <HTML> <HEAD> <TITLE> Hello World </TITLE> </HEAD> <BODY> <P>hello world</P> </BODY> </HTML>
In IPv4 environment(usually) we used to call function gethostbyname() to do DNS lookups.then the information is load into a struct hostent.
#include <netdb.h> struct hostent *gethostbyname(const char *name); struct hostent { char *h_name; /* official name of host */ char **h_aliases; /* alias list */ int h_addrtype; /* host address type */ int h_length; /* length of address */ char **h_addr_list; /* list of addresses from name server */ }; #define h_addr h_addr_list[0] /* address, for backward compatibility */
So, the easiest way to get information from gethostbyname() call is by extracting hostent structure.
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