Client/Server

Denne kode sender en Get kommando til en webserver (google.com) og får en hjemmeside tilbage.

#include <iostream.h>
#include <winsock.h>

void main()
{
char        tpkt[21] = "GET / HTTP/1.0 \n\n";  /* message to send to host */
char        servername[80]="216.239.37.101";    /* pointer to name of server */
struct      hostent *h;                        /* getnamebyhost info returned */
struct      sockaddr_in sa;                    /* socket address */
int        fd;                                /* socket descriptor */
short      portnum=80;                        /* port number of server */
int        funcstatus;                        /* returned status from socket functions */
int        inlen;                              /* length of input message */
char        inbuf[200000];                      /* input message buffer */
WSADATA    wsaData;                            /* Winsock parameters */

WSAStartup( 0x0101, &wsaData);

/* get host address */
h = gethostbyname(servername);
if (h == NULL) {
      cout << "gethostbyname error";
      exit(0);
      }


/*  build socket structure  */
memcpy((char *)&sa.sin_addr,(char *)h->h_addr, h->h_length);
sa.sin_family = h->h_addrtype;
sa.sin_port = htons(portnum);

/*  allocate an open socket */
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd == -1) {
      cout << "socket creation error";
      cin.ignore();
      exit(0);
      }
else
      cout << "socket created\n";



/*  connect to the server */
if (connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
      cout << "connect error";
        cin.ignore();
      exit(0);
      }
cout << "connected\n";

/* send a packet to the server */
funcstatus = send(fd, tpkt, strlen(tpkt)+1, 0 );
if (funcstatus == -1) {
      cout << "Error sending data to server\n";
      cin.ignore();
      exit(0);
      }
cout << "packet sent to server\n";

/* wait for a reply */
inlen = recv(fd, inbuf, 200000, 0);
if (inlen < 0)
      cout << "Error receiving data from the server\n";
else
      cout << inlen << " byte reply from server" << inbuf;

WSACleanup();
cin.ignore();
}

nice =)