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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>

#define PORT 4711
#define BUF_SIZE 1024

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

  int                   sock, run;
  char                  buf[BUF_SIZE];
  struct sockaddr_in    server;
  struct hostent       *hp;
  struct in_addr        ia;

  if (argc != 2) {
    fprintf(stderr,"usage: client <hostname>\n");
    exit(2);
  }

  // create socket
  sock = socket(AF_INET, SOCK_STREAM, 0);
  if (sock < 0) {
    perror("error opening stream socket!");
    exit(1);
  }
  server.sin_family = AF_INET;
  // get internet address of host specified by command line
  hp = gethostbyname(argv[1]);
  if (hp == NULL) {
    fprintf(stderr, "%s unknown host.\n", argv[1]);
    exit(2);
  } else {
    printf("%s is a known host! adress = %d.%d.%d.%d = \n", hp->h_name, hp->h_addr_list[0][0], hp->h_addr_list[0][1], hp->h_addr_list[0][2], hp->h_addr_list[0][3]); //, inet_ntoa(server.sin_addr));

  }

  // copies the internet address to server adress
  bcopy(hp->h_addr, &server.sin_addr, hp->h_length);

  // set port
  server.sin_port = PORT;

  // open connection
  printf("Trying to connect...\n");
  if(connect(sock, (struct sockaddr*)&server,sizeof(struct sockaddr_in)) < 0)
  {
     perror("connecting stream socket");
     exit(1);
  } else {
    printf("connect OK\n");
  }
  printf("OK\n");

 strcpy(buf, "HELLO\n");
 write(sock, buf, strlen(buf));

 /*
  // read input from stdin
  while(run=read(0,buf,BUF_SIZE)) {
    if(run<0) {
      perror("error reading from stdin");
      exit(1);
    }
    // write buffer to stream socket
    if(write(sock,buf,run) < 0)
    {
      perror("writing on stream socket");
      exit(1);
    }
  }
*/

  close(sock);

}

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#ifndef CLASSVISUALISETCPDATADIALOG_H
#define CLASSVISUALISETCPDATADIALOG_H

#include <QTcpServer>
#include <QMessageBox>
#include "ui_visualiseTCPData.h"

class visualiseTCPDataDialog : public QDialog, public Ui_visualiseTCPDataDialog
{
  Q_OBJECT

  public:
  visualiseTCPDataDialog(QWidget *parent = 0);

  private slots:
  void slot_pbStartServerPressed();
  void slot_pbStopServerPressed();
  void slot_NewConnection();

  private:
  QTcpServer *tcpServer;

};

#endif

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#include "gpsview_visualiseTCPDataDialog.h"

visualiseTCPDataDialog::visualiseTCPDataDialog(QWidget *parent) : QDialog(parent)
{

  setupUi(this);

  connect( pbStartServer, SIGNAL(clicked()), this, SLOT(slot_pbStartServerPressed()) );
  connect( pbStopServer, SIGNAL(clicked()), this, SLOT(slot_pbStopServerPressed()) );

}

void visualiseTCPDataDialog::slot_pbStartServerPressed() {
  printf("Starting server...\n");

  tcpServer = new QTcpServer(this);

  if (!tcpServer->listen(QHostAddress::Any, 4711)) {
        QMessageBox::critical(this, tr("TCP Server"), tr("Unable to start the server: %1.") .arg(tcpServer->errorString()));
        close();
        return;
     } else {
        QMessageBox::information(this, tr("TCP Server"), tr("The server is running on port %1.\n"
                            "Run the Fortune Client example now.")
                          .arg(tcpServer->serverPort()));

        connect( tcpServer, SIGNAL(newConnection()), this, SLOT(slot_NewConnection()) );

        lbPort->setText( QString( "%1" ).arg(tcpServer->serverPort()) );
     }

   if (tcpServer->isListening()) {
      printf("Server is listening!\n");
   } else {
      printf("Server is not listening!\n");
   }

   if (tcpServer->hasPendingConnections() ) {
      printf("Server has pending connections!\n");
   } else {
      printf("Server has no pending connections!\n");
   }

   connect(tcpServer, SIGNAL(newConnection()), this, SLOT(slot_NewConnection()));

}

void visualiseTCPDataDialog::slot_pbStopServerPressed() {
  printf("Stopping server...\n");

   if (tcpServer->hasPendingConnections() ) {
      printf("Server has pending connections!\n");
   } else {
      printf("Server has no pending connections!\n");
   }

  tcpServer->close();
  lbPort->setText( QString( "?" ) );

   if (tcpServer->isListening()) {
      printf("Server is listening!\n");
   } else {
      printf("Server is not listening!\n");
   }

}

void visualiseTCPDataDialog::slot_NewConnection() {
  printf("New connection!\n");
}

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cc -o client client.c && client localhost
client.c: In function ‘main’:
client.c:42: warning: incompatible implicit declaration of built-in function ‘bcopy’
client.c:58: warning: incompatible implicit declaration of built-in function ‘strcpy’
client.c:59: warning: incompatible implicit declaration of built-in function ‘strlen’
localhost is a known host! adress = 127.0.0.1 =
Trying to connect...
connecting stream socket: Connection refused

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server.sin_port = PORT;

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server.sin_port = htons(PORT);