UDP socket code

Server (acceptor) Program:

1. Create a socket)

2. Bind the socket to a local address and port (BIND)

3. Data to be received (recvfrom)

4. Disable socket.

Client (sender) Program

1. Create a socket)

2. Send data (sendto) to the server)

3. Close the socket.

Server code:

# Include <winsock2.h>

# Include <stdio. h>

Void main ()

{

Word wversionrequested;

Wsadata;

Int err;

Wversionrequested = makeword (1, 1 );

Err = wsastartup (wversionrequested, & wsadata );

If (Err! = 0)

{

Reutrn;

}

If (lobyte (wsadata. wversion )! = 1 | hibyte (wsadata. wversion )! = 1)

{

Wsacleanup ();

Return;

}

Socket socksrv = socket (af_inet, sock_dgram, 0 );

Sockaddr_in addrsrv;

Addrsrv. sin_addr.s_un.s_addr = htonl (inaddr_any );

Addrsrv. sin_family = af_inet;

Addrsrv. sin_port = htons (6000 );

BIND (socksrv, (sockaddr *) & addrsrv, sizeof (sockaddr ));

Sockaddr_in addrclient;

Int Len = sizeof (sockaddr );

Char recvbuf [100];

Recvfrom (socksrv, recvbuf, 100,0, (sockaddr *) & addrclient, & Len );

Printf ("% s/n", recvbuf );

Cloasesocket (socksrv );

Wsacleanup ();

}

Client Lu code:

# Include (winsock2.h>

# Include <stdio. h>

Void main ()

{

Word wversionrequested;

Wsadata;

Int err;

Wversionrequested = makeword (1, 1 );

Err = wsastartup (wversionrequested, & wsadata );

If (Err! = 0)

{

Return;

}

If (lobyte (wsadata. wversion )! = 1 | hibyte (wsadata. wversion )! = 1)

{

Wsacleanup ();

Return;

}

Socket sockclient = socket (af_inet, sock_dgram <0 );

Sockaddr_in addrsrv;

Addrsrv. sin_addr.s_un.s_addr = inet_addr ("127.0.0.1 ");

Addrsrv. sin_family = af_inet;

Addrsrv. sin_port = htons (6000 );

Sendto (sockclient, "hello", strlen ("hello") + 1,0, (sockaddr *) & addrsrv, sizeof (sockaddr )):

Closesocket (sockclient );

Wsacleanup ();

}