C++ write to files

Question

#include <fstream>
#include <iostream>

using namespace std;

int main()
{
    ofstream f_out;
    f_out.open("teste.txt");

    if(! f_out.good())
        return -1;
    else cout << "Arquivo criado!";

    string str = "String";
    f_out << str;

    f_out.close();

    return 0;
}

This code should write in a file txt, but it doesn’t. What should I do to get something written in a file txt using the function open to open the file?

Answer 1

You may be using ofstream which is an output stream class that operates on files.

EDIT: Remember to be passing the opening mode and the complete directory of the file you want to handle if it is not in the same folder as your program’s executable.

Example: f_out.open("C:\\Users\\Pasta\\teste.txt", std::ios::app);

See also the reference C++ Reference

std::ofstream Hypnos_FILE;
std::string TEXTO = "Escrevendo em arquivo de texto";
Hypnos_FILE.open("DATABASE\\Arquivo.txt", std::ios::app);
if (Hypnos_FILE.is_open())
{
   std::cout << "Arquivo de texto aberto com sucesso!" << std::endl;

   Hypnos_FILE << TEXTO;

}
else
   std::cout << "Erro ao abrir arquivo de texto.";

Hypnos_FILE.close();

open (filename, mode);

Ios:in = Open for entry operations.

Ios:out = Open for exit operations.

Ios:: = Open in binary mode.

Ios:: = Set the starting position at the end of the file. If this flag is not set, the starting position is the beginning of the file.

Ios: = All output operations are performed at the end of the file by adding the contents to the current file content.

Ios::trunc = If the file is opened for output operations and it already existed, its previous content is deleted and replaced by a new one.