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.
PROMPT
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25 #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; ...........
3a
1a line 52
Segmentation fault
Code complet:
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188 #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; }Merci de votre attention,
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61 #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 };
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