Socket programming instance in UDP windows

Source code of the server program:
# Include <stdio. h>
# Include <winsock2.h>
Void main ()
{
Socket socket1;
// Initwinsock ();
Wsadata;
Int ierrorcode;
If (wsastartup (makeword (2, 1), & wsadata) // call Windows Sockets DLL
{
Printf ("Winsock cannot be initialized! \ N ");
Wsacleanup ();
Return;
}
Printf ("the server starts to create a socket. \ N ");
Struct sockaddr_in local;
Struct sockaddr_in from;
Int fromlen = sizeof (from );
Local. sin_family = af_inet;
Local. sin_port = htons (27015); // listener Port
Local. sin_addr.s_addr = inaddr_any; // Local Machine
Socket1 = socket (af_inet, sock_dgram, 0 );
BIND (socket1, (struct sockaddr *) & Local, sizeof (local ));
While (1)
{
Char buffer [1024] = "\ 0 ";
Printf ("waiting for message from others ------------- \ n ");
If (recvfrom (socket1, buffer, sizeof (buffer), 0, (struct sockaddr *) & from, & fromlen )! = Socket_error)
{
Printf ("received datainfrom % s -- % s \ n", inet_ntoa (from. sin_addr), buffer );
//// Send a message to cilent
Sendto (socket1, buffer, sizeof (buffer), 0, (struct sockaddr *) & from, fromlen );
}
// Sleep (1, 1000 );
}
Closesocket (socket1 );
Wsacleanup ();
}
Client source code:
# Include <stdio. h>
# Include <winsock2.h>
Void main ()
{
Socket socket1;
// Initwinsock ();
Wsadata;
Int ierrorcode;
If (wsastartup (makeword (2, 1), & wsadata) // call Windows Sockets DLL
{
Printf ("Winsock cannot be initialized! \ N ");
Wsacleanup ();
Return;
}
Printf ("the server starts to create a socket. \ N ");
Struct sockaddr_in server;
Int Len = sizeof (server );
Server. sin_family = af_inet;
Server. sin_port = htons (27015); // listener port of the server
Server. sin_addr.s_addr = inet_addr ("221.223.16.32"); // server address
Socket1 = socket (af_inet, sock_dgram, 0 );
While (1)
{
Char buffer [1024] = "\ 0 ";
Printf ("input message \ n ");
Scanf ("% s", buffer );
// Printf ("% s", buffer );
If (strcmp (buffer, "bye") = 0)
{
Printf ("quit! \ N ");
Sleep (100 );
Closesocket (socket1 );
Break;
}
If (sendto (socket1, buffer, sizeof (buffer), 0, (struct sockaddr *) & server, Len )! = Socket_error)
{
// Printf ("sending .. \ n ");
Sleep (100 );
If (recvfrom (socket1, buffer, sizeof (buffer), 0, (struct sockaddr *) & server, & Len )! = Socket_error)
Printf ("rece from server: % s \ n", buffer );
}
}
Closesocket (socket1 );
Wsacleanup ();

}