Winsock converts host names and IP addresses

# Include <winsock2.h>
# Include <stdio. h>
# Include <conio. h> wsadata; bool initsocket ()
{
Word wversionrequested;
Int err;

Wversionrequested = makeword (2, 0); // query Winsock 2.0
Err = wsastartup (wversionrequested, & wsadata); // load and initialize Windows Sockets DLL
If (Err! = 0 ){
Printf ("no windows socket dynamic library! \ N ");
Getch ();
Return false;
}
If (lobyte (wsadata. wversion )! = 2 | hibyte (wsadata. wversion )! = 0 ){
Printf ("Windows Socket 2 is required! \ N ");
Getch ();
Wsacleanup ();
Return false;
}
Return true;
} Int main (INT argc, char * argv [])
{
// Local variable Declaration
// Wsadata;
Lphostent;
DWORD dwipaddr;
Lpstr szipaddr;
Char buf_domname [24] = "";
Char buf_ip [15] = ""; if (! Initsocket ())
Printf ("Winsock start error! ");
Else
Printf ("program is running: \ n"); printf ("DNS resolve test program's ready ");
Printf ("(no input equals Local Machine) ...... \ n ");
Printf ("\ n"); // start domain name resolve here.
Printf ("Please enter the domain name :");
Gets (buf_domname); // perform resolve here.
Lphostent = gethostbyname (buf_domname );
If (! Lphostent)
{
// Error occurs!
Printf ("cocould not get IP address! ");
Printf ("\ n ");
}
Else
{
// Convert & Output
Szipaddr = inet_ntoa (* (lpin_addr) * (lphostent-> h_addr_list ));
Printf (szipaddr );
Printf ("\ n ");
} // Start IP resolve here.
Printf ("Please enter the IP Address :");
Gets (buf_ip); dwipaddr = inet_addr (buf_ip );
If (dwipaddr = inaddr_none)
// Ip address validation failed!
Printf ("invalid Internet address! \ N ");
Else
{
Lphostent = gethostbyaddr (lpstr) & dwipaddr, sizeof (dwipaddr), af_inet );
If (! Lphostent)
{
// Error occures!
Printf ("cocould not get host name! ");
Printf ("\ n ");
}
Else
{
// Output
Printf (lphostent-> h_name );
Printf ("\ n ");
}
} // Shut down the socket
Wsacleanup ();
Printf ("\ n ");
Return 0 ;}