Bonjour à tous,

J'ai un Segmentation fault à l'entrée des fonctions displayAllStats(); et updateStat(index); et displayStat(index);

Si, je n'utilise pas ces fonctions le reste du code va très bien.




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#include <iostream>  
#include <fstream>	
#include <sstream>	
 
........
int main()
{
std::cout << "3a" << std::endl;
    displayAllStats();
 
 
.....
}
 
void displayAllStats()
{
 
	 std::cout << "1a line "<< __LINE__  << std::endl;
 
	std::fstream ifile("tempStats.bin", std::ios_base::binary | std::ios_base::out | std::ios_base::out);
 
 std::cout << "1bline "<< __LINE__  << std::endl;
 
...........
PROMPT

3a
1a line 52
Segmentation fault


Code complet:
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#ifdef _c
#error This source file is not C  but rather C++
#endif
 
/*
cd /home/Another/softc++/files
cd /home/Another/softc++/files
 
x86_64-w64-mingw32-c++.exe   -Wall     -fmax-errors=5     -Wextra       -O2     tst.cpp  -o  tst.exe
history -c
*/
#include "stdafx.h"
#include <iostream>   // For std::cout etc. 
#include <fstream>	//file  stream classes:
#include <sstream>
#include "tempStat.h"
/*
typedef basic_istringstream string istringstream;
typedef basic_ostream char* ostream;
typedef basic_fstream char* fstream; */
 
 
using std::cout;    // le programme utilise cout.
using std::cin;     // le programme utilise cin.
using std::endl;    // le programme utilise endl.
using std::string;
 
void updateStat(int index);
void displayStat(int index);
void displayAllStats();
std::ostream &operator << (std::ostream &os, const tempStat &ts);
std::istream &operator >> (std::istream &is, const tempStat &ts);
 
//Insert formatted output (public member function )
std::ostream &operator << (std::ostream &os, const tempStat &ts)
{
  os << ts.minimum << "," << ts.maximum;
  return os;
}
//Extract formatted input
std::istream &operator >> (std::istream &is, tempStat &ts)
{
  is >> ts.minimum  >> ts.maximum;
  return is;
}
 
 
void displayAllStats()
{
 
 
  std::cout << "1a line " << __LINE__  << std::endl;
  /*   std::fstream ifile;
  ifile.open ("tempStats.bin", std::ios_base::binary);
  if ( (ifile.rdstate() & std::fstream::failbit ) != 0 )
  {
  std::cerr << "Error opening 'tempStats.bin'\n";
  }
  else
  { */
 
  std::fstream ifile("tempStats.bin", std::ios_base::binary | std::ios_base::out | std::ios_base::out);
 
 
  std::cout << "1c line " << __LINE__  << std::endl;
  int index = 0;
  while(!ifile.eof())
    {
    tempStat ts ;
    ts.read(ifile);
 
    if (ifile.gcount() == 0)
      {
      break;
      }
 
    std::cout
        << "Index " << index
        << ", tempStat: " << ts
        << std::endl;
 
    index++;
    }
 
  ifile.close();
  /*   } */
 
 
}
 
void updateStat(int index)
{
  tempStat ts ;
  std::cout << "Enter minimum and maximum temperatures: ";
  std::cin >> ts;
  std::cout << "4a" << endl;
  std::fstream ofile("tempStats.bin", std::ios_base::binary | std::ios_base::out | std::ios_base::in);
  std::cout << "4b" << endl;
  if (ofile.is_open())
    {
    ts.write(ofile, index);
    ofile.close();
    }
  else
    {
    std::cerr << "Couln't open tempStats.bin for writing." << std::endl;
    }
}
 
void displayStat(int index)
{
  return;
  std::fstream ifile("tempStats.bin", std::ios_base::binary | std::ios_base::out | std::ios_base::in);
  if (ifile.is_open())
    {
    tempStat ts ;
    ts.read(ifile, index);
    ifile.close();
    }
  else
    {
    std::cerr << "Couln't open tempStats.bin for reading." << std::endl;
    }
}
 
 
 
/*
history -c
*/
 
int main()
{
 
  std::cout << "Temperature utility." << endl;
  std::ofstream ofile;
  ofile.open ("tempStats.bin", std::ios_base::binary);
  if ( (ofile.rdstate() & std::ofstream::failbit ) != 0 )
    {
    std::cerr << "Error opening 'tempStats.bin'\n";
    }
  else
    {
    tempStat(-2.5, 7.5).write(ofile);
    tempStat(0, 9.9).write(ofile);
    tempStat(2.5, 11.0).write(ofile);
    tempStat(5.5, 14.5).write(ofile);
    tempStat(7.0, 17.7).write(ofile);
    tempStat(10.5, 23.7).write(ofile);
    tempStat(11.7, 29.5).write(ofile);
    tempStat(7.6, 22.9).write(ofile);
    tempStat(7.2, 21.5).write(ofile);
    tempStat(2.0, 16.0).write(ofile);
    tempStat(-4.7, 12.5).write(ofile);
    tempStat(-1.9, 8.5).write(ofile);
 
    ofile.close();
 
    std::cout << "Finished writing binary data to tempStats.bin." << std::endl;
    std::cout << "3a" << std::endl;
    displayAllStats();
    std::cout << "3b" << std::endl;
 
 
    std::cout << "Temp stats initially:" << endl;
    int index = 0;
    std::cout << "Which month?:" << std::endl;
    std::cin  >> index;
 
    if (index < 0 || index >= 12)
      {
      std::cerr << "Invalid index." << std::endl;
      }
    else
      {
      updateStat(index);
      displayStat(index);
 
      std::cerr << "Temp stats finally.." << std::endl;
      displayAllStats();
 
      }
 
    }
 
  return 0;
}
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#ifdef _c
#error This source file is not C  but rather C++.
#endif
 
#pragma once
#include <iostream>	//  std::cin, std::cout, std::hex
#include <string> //http://www.cplusplus.com/reference/string/string/?kw=string
 
 
class tempStat
{
public:
	double minimum, maximum;
	static const size_t RECORD_SIZE = 2 * sizeof(double);
 
 
	tempStat(double min = 0.0, double max = 0.0)
	: minimum(min), maximum(max)
	{}
 
	void write (std::ostream& os)
	{
		os.write((char*)&minimum, sizeof(double));
		os.write((char*)&maximum, sizeof(double));
	}
//can read input file stream or  input stream 
	void read (std::istream& is)
	{
		is.read((char*)&minimum, sizeof(double));
		is.read((char*)&maximum, sizeof(double));
	}
 
//write  tempStat  at specified index in file stream
	void write (std::ostream& os, int index)
	{
		std::streampos pos(index * RECORD_SIZE);
 
		os.seekp(pos); 
		std::cout<< "About to write record at position"  << os.tellp() << std::endl;
 
		os.write((char*)&minimum, sizeof(double));
		os.write((char*)&maximum, sizeof(double));
	}
 
//read tempStat at specified index in file stream
	void read (std::istream& is, int index)
	{
		std::streampos pos(index * RECORD_SIZE);
 
		is.seekg(pos);
		std::cout<< "About to read record at position" << is.tellg() << std::endl;
 
		is.read((char*)&minimum, sizeof(double));
		is.read((char*)&maximum, sizeof(double));
	}
 
 
 
	//plus others , as appropriate
};
Merci de votre attention,

JPDaviau