VC sockets Programming

There are three types of socket programming: stream socket (sock_stream), datagram socket (sock_dgram), and original socket (sock_raw). TCP-based socket programming is a streaming socket. In this Program To add two projects to one workspace. Link a library file of ws2_32.lib.

Server programming steps:

1: load the socket library and create a socket (wsastartup ()/socket ());

2: bind a socket to an IP address and a port (BIND ());

3: Set the socket to listening mode and wait for the connection request (Listen ());

4: after the request arrives, accept the connection request and return a new socket (accept () corresponding to the connection ());

5: Use the returned socket to communicate with the client (send ()/Recv ());

6: return. Wait for another connection request;

7. Close the socket and the loaded socket Library (closesocket ()/wsacleanup ()).

Server Code As follows: # Include < Stdio. h >
# Include < Winsock2.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 socksrv = Socket (af_inet, sock_stream, 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 ));

Listen (socksrv, 5 );

Sockaddr_in addrclient;
  Int Len = Sizeof (Sockaddr );
  While ( 1 )
  {
Socket sockconn = Accept (socksrv, (sockaddr * ) & Addrclient, & Len );
Char Sendbuf [ 50 ];
Sprintf (sendbuf, " Welcome % s to here! " , Inet_ntoa (addrclient. sin_addr ));
Send (sockconn, sendbuf, strlen (sendbuf) + 1 , 0 );
Char Recvbuf [ 50 ];
Recv (sockconn, recvbuf, 50 , 0 );
Printf ( " % S \ n " , Recvbuf );
Closesocket (sockconn );
}

}

Client programming steps:

1: load the socket library and create a socket (wsastartup ()/socket ());

2: Send a connection request (connect () to the server ());

3: communicate with the server (send ()/Recv ());

4: Close the socket and close the loaded socket Library (closesocket ()/wsacleanup ()).

The client code is as follows: # Include < Stdio. h >
# Include < Winsock2.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_stream, 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 );
Connect (sockclient, (sockaddr * ) & Addrsrv, Sizeof (Sockaddr ));
Send (sockclient, " Hello " , Strlen ( " Hello " ) + 1 , 0 );
  Char Recvbuf [ 50 ];
Recv (sockclient, recvbuf, 50 , 0 );
Printf ( " % S \ n " , Recvbuf );
 
Closesocket (sockclient );
Wsacleanup ();
}

(Transfer)