ConnexReadIP

Syntax

int ConnexReadIP(int fildes,unsigned char **buffer);

Header

base/connex.h

Library

cnx

Description

The ConnexReadIP function reads formatted data packets from a TCP/IP socket stream connection.

The file descriptor of the socket is given by the argument fildes. Memory is allocated to store the decoded data and the pointer to the buffer is stored at the location pointed to by the argument buffer.

The memory allocated for the data should be freed when it is no longer required.

Returns

Returns the size of the decoded data on success. On error, (-1) is returned.

Errors

On error, (-1) is returned.

Example

Source Code: ConnexReadIP.c

/* ConnexReadIP.c
   ==============
   Author: R.J.Barnes
 Copyright (c) 2012 The Johns Hopkins University/Applied Physics Laboratory

This file is part of the Radar Software Toolkit (RST).

RST is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

Modifications:



#include <stdio.h>
#include <stdlib.h>
#include "connex.h"

int main(int argc,char *argv[]) {
  int sock;
  int port=0;
  char *host=NULL;
  int size;
  unsigned char *buffer=NULL;
 
  
  if (argc<3) { 
    fprintf(stderr,"host and port must be specified.'n");
    exit(-1);
  }

  host=argv[1];
  port=atoi(argv[2]);
 
  sock=ConnexOpen(host,port); 
  if (sock<0) {
    fprintf(stderr,"Could not connect to host.'n");
    exit(-1);
  }
  do {
   size=ConnexReadIP(sock,&buffer);
   if (size==-1) break;
   fprintf(stderr,"Message size:%d'n",size);
     
  } while(1);
  fprintf(stderr,"Connection failed.'n");
  return 0;

}