#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
/* Windows-System */
#ifdef _WIN32
#include <iostream.h>
#include <winsock.h>
#include <io.h>
/* Unix-System */
#else
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#endif

int main(int argc, char **argv)
{

int sock;
struct sockaddr_in host_addr;
struct hostent *hostinfo;
char *host;

char buf[1024];
unsigned int bytes_sent, bytes_recv;

/* ggf. Winsock initialisieren */
#ifdef _WIN32
WSADATA wsaData;
if (WSAStartup (MAKEWORD(1, 1), &wsaData) != 0) {
fprintf (stderr, "WSAStartup(): Kann Winsock nicht initialisieren.\n");
exit (EXIT_FAILURE);
}
#endif

/* Socket erzeugen */
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1) {
perror ("socket()");
exit (EXIT_FAILURE);
}

/* Adresse des Servers festlegen */
memset( &host_addr, 0, sizeof (host_addr));
host_addr.sin_family = AF_INET;
host_addr.sin_port = htons (7447);

host_addr.sin_addr.s_addr = inet_addr ("127.0.0.1");
if (host_addr.sin_addr.s_addr == INADDR_NONE) {
/* Server wurde nicht mit IP sondern mit dem Namen angegeben /
hostinfo = gethostbyname ("127.0.0.1");
if (hostinfo == NULL) {
perror ("gethostbyname()");
exit (EXIT_FAILURE);
}
memcpy((char) &host_addr.sin_addr.s_addr, hostinfo->h_addr, hostinfo->h_length);
}

/* Verbindung aufbauen */
if (connect(sock, (struct sockaddr &host_addr, sizeof(struct sockaddr)) == INVALID_SOCKET) {
{
puts("Fehler beim Erstellen des Socket!\n");
}
exit (EXIT_FAILURE);

}

// define variables (welcmsg is the welcome msg for the server)
char welcmsg[]="Willkommen.\n\n\r\r";
int bytes;

// send welcomemsg
send(sock, welcmsg, strlen(welcmsg), 0);

// send "TEXT ";
strcpy(buf, "Na Alles Fit: ");
bytes = send(sock, buf, strlen(buf), 0);

// Antwort des Servers empfangen und ausgeben */
while ((bytes_recv = recv (sock, buf, sizeof(buf), 0)) > 0) {
write (1, buf, bytes_recv);
}
if (bytes_recv == -1) {
perror ("recv()");
exit (EXIT_FAILURE);
}

printf ("\n");

#ifdef _WIN32
closesocket(sock);
WSACleanup();
#else
close(sock);
#endif

return 0;

}

Im Zweifelsfall bitte auch folgende Hinweise beachten:
C/C++ Forum :: FAQ - Sonstiges :: Wohin mit meiner Frage?

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