MySocketTCP/MySocketTCP.h

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//version 1.0, base development ij 19/01/09

/* Modified by anna on 19.01.2008 */
/*
  canceled SetupParameters() and varaibles intialized in the constructors' headers;
  defined SEND_REC_MAX_SIZE (for compatibilty with mythen (and possibly other)  pure C servers (i would move it to the common header file)

  added #ifndef C_ONLY... to cutout class definition when including in pure C servers (can be removed if SEND_REC_MAX_SIZE is moved to the common header file)

  defined private variables char hostname[1000] and int portno to store connection informations;

  defined public functions  int getHostname(char *name) and  int getPortNumber() to retrieve connection informations
  
  added public function int getErrorStatus() returning 1 if socketDescriptor<0

  remove exits in the constructors and replace them with socketDescriptor=-1

  replaced the argument of send/receive data with void (to avoid too much casting or compiler errors/warnings)

  added a function which really does not close the socket between send/receive (senddataonly, receivedataonly)

*/
#ifndef MY_SOCKET_TCP_H
#define MY_SOCKET_TCP_H 

#define SEND_REC_MAX_SIZE 4096
#define DEFAULT_PORTNO    1952


#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>


#include <math.h>

class MySocketTCP{

 public:
  MySocketTCP(const char* const host_ip_or_name, unsigned short int const port_number); // sender (client): where to? ip 
  MySocketTCP(unsigned short int const port_number); // receiver (server) local no need for ip 
  ~MySocketTCP();

  int getHostname(char *name);
  int getPortNumber(){return portno;};
  int getErrorStatus(){if (socketDescriptor<0) return 1; else return 0;};



  int  Connect(); //establish connection a Disconnect should always follow
  void Disconnect(); //free connection

  //The following two functions will connectioned->send/receive->disconnect
  int  SendData(void* buf,int length);//length in characters
  int  ReceiveData(void* buf,int length);
 

  //The following two functions stay connected, blocking other connections, and must be manually disconnected,
  //          when the last call is a SendData() or ReceiveData() the disconnection will be done automatically
  //These function will also automatically disconnect->reconnect if
  //          two reads (or two writes) are called in a row to preserve the data send/receive structure 
  int  SendDataAndKeepConnection(void* buf,int length);
  int  ReceiveDataAndKeepConnection(void* buf,int length);


  // Danger! These functions do not connect nor disconnect nor flush the data! be sure that send-receive match perfectly on both server and client side!
  int  SendDataOnly(void* buf,int length);
  int  ReceiveDataOnly(void* buf,int length);

 private:

  char hostname[1000];
  int portno;

  int is_a_server;
  int socketDescriptor;
  struct sockaddr_in clientAddress, serverAddress;
  socklen_t clientAddress_length;

  int file_des;

  int send_rec_max_size;
  bool last_keep_connection_open_action_was_a_send;


  //  void SetupParameters();

};
#endif

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