Can anyone have examples of the finished server and customer communicating via TCP / IP ? It is desirable to with . If there is, you can and under unix , and under Windows .

Answer 1, Authority 100%

For Unix (embroidered from Ineta):

Server.

# include & lt; stdio.h & gt;
#Include & lt; stdlib.h & gt;
#Include & lt; String.h & gt;
#Include & lt; unistd.h & gt;
#Include & lt; sys / Types.h & gt;
#Include & lt; sys / socket.h & gt;
#Include & lt; netinet / in.h & gt;
Void Error (Const Char * MSG)
{
  PERROR (MSG);
  EXIT (1);
}
Int Main (int argc, char * argv [])
{
   int sockfd, newsockfd, portno;
   SOCKLEN_T CLILEN;
   Char Buffer [256];
   STRUCT SOCADDR_IN SERV_ADDR, CLI_ADDR;
   int n;
   if (argc & lt; 2) {
     FPRINTF (STDERR, "ERROR, NO Port Provided \ N");
     EXIT (1);
   }
   SOCKFD = Socket (AF_INET, SOCK_STREAM, 0);
   if (Sockfd & lt; 0)
    ERROR ("Error Opening Socket");
   Bzero ((char *) & amp; serv_addr, sizeof (serv_addr));
   portno = ATOI (ARGV [1]);
   serv_addr.sin_family = af_inet;
   serv_addr.sin_addr.s_addr = inaddr_any;
   SERV_ADDR.SIN_PORT = HTNS (Portno);
   If (Bindddr *) & Amp; SERV_ADDR,
       SizeOF (SERV_ADDR)) & lt; 0)
       error ("Error On Binding");
   Listen (SOCKFD, 5);
   CLILEN = SIZEOF (CLI_ADDR);
   newsockfd = accept (sockfd,
         (struct SOCKADDR *) & amp; CLI_ADDR,
         & amp; clip);
   if (newsockfd & lt; 0)
     ERROR ("Error on Accept");
   BZERO (Buffer, 256);
   n = read (newsockfd, buffer, 255);
   if (N & LT; 0) Error ("Error Reading From Socket");
   PRINTF ("HERE IS THE MESSAGE:% S \ N", Buffer);
   n = write (Newsockfd, "I GOT Your Message", 18);
   if (N & LT; 0) Error ("Error Writing to Socket");
   Close (Newsockfd);
   Close (Sockfd);
   Return 0;
}

client.

# include & lt; stdio.h & gt;
#Include & lt; stdlib.h & gt;
#Include & lt; unistd.h & gt;
#Include & lt; String.h & gt;
#Include & lt; sys / Types.h & gt;
#Include & lt; sys / socket.h & gt;
#Include & lt; netinet / in.h & gt;
#Include & lt; netdb.h & gt;
Void Error (Const Char * MSG)
{
  PERROR (MSG);
  EXIT (0);
}
Int Main (int argc, char * argv [])
{
  INT SOCKFD, PORTNO, N;
  STRUCT SOCKADDR_IN SERV_ADDR;
  STRUCT HOSTENT * SERVER;
  Char Buffer [256];
  if (argc & lt; 3) {
    FPRINTF (STDERR, "Usage% s HostName Port \ n", argv [0]);
    EXIT (0);
  }
  portno = ATOI (ARGV [2]);
  SOCKFD = Socket (AF_INET, SOCK_STREAM, 0);
  if (Sockfd & lt; 0)
    ERROR ("Error Opening Socket");
  Server = GetHostByname (ARGV [1]);
  If (Server == NULL) {
    FPRINTF (STDERR, "ERROR, NO SUCH HOST \ N");
    EXIT (0);
  }
  Bzero ((char *) & amp; serv_addr, sizeof (serv_addr));
  serv_addr.sin_family = af_inet;
  BCOPY ((Char *) Server- & gt; h_addr,
     (char *) & amp; serv_addr.sin_addr.s_addr,
     Server- & gt; h_LENGTH);
  SERV_ADDR.SIN_PORT = HTNS (Portno);
  if (connectdr *) & amp; serv_addr, sizeof (serv_addr)) & lt; 0)
    ERROR ("Error Connecting");
  Printf ("Please Enter The Message:");
  BZERO (Buffer, 256);
  FGETS (Buffer, 255, Stdin);
  N = Write (Sockfd, Buffer, Strlen (Buffer));
  if (n & lt; 0)
     ERROR ("Error Writing to Socket");
  BZERO (Buffer, 256);
  n = read (sockfd, buffer, 255);
  if (n & lt; 0)
     error ("Error Reading From Socket");
  PrintF ("% s \ n", buffer);
  Close (Sockfd);
  Return 0;
}

Answer 2, Authority 33%

Alp – an excellent programming book on C. In details, an example of creating such applications is painted. The book is the truth is calculated on Linux programmers, but without a doubt Must Read those who decided to make deeper with, and from there there is something to learn.