Implementing multiple text file creation in function

Question

First question

Suppose there is a function Func() . How can I implement the creation of a separate out text file with the name имя_файла.txt using streams with each function call?

 ofstream out; out.open("имя_файла.txt");

but so that a number (sequence number) is added to the file name each time, like имя_файла_1.txt on the first call to the function, имя_файла_2.txt on the second call.

Second question

The user enters the path to the file, for example, D:\Документы\input.txt . The program reads this, but when you try to open such a file along this path, an error appears as if the file is not open.

 cout << "Type full path to the file" << endl; gets_s(path); ifstream dump; dump.open(path); if (!dump.is_open()) cout << "File is not opened" << endl;

How to fix this error?

Accepted Answer · 2017-05-31T18:33:04

The function to_string can help in solving the first question . In addition, you should take advantage of the opportunity, as a static variable in the function . Thus, to create a file with the name имя_файла_<i>.txt you need to write:

 void func() { // это статическая переменная // она имеет тип atomic_*, чтобы при вызове нашей функции из разных потоков не получались файлы с одинаковыми именами static atomic_size_t numberFiles; size_t currentFileIndex = numberFiles++; ofstream out("имя_файла" + to_string(currentFileIndex) + ".txt"); ... }

The second question is not very clear. If the user has entered the file name, but there is no such file, then the user is mistaken with the file name. You can tell him about it, like this:

 while (!dump.is_open()) { cout << "Такого файла не существует" << endl; cout << "Пожалуйста, введите правильное имя файла:" << endl; getline(cin, path); dump.open(path); }

With the second figured out, the path to the file was registered in Cyrillic and the compiler did not perceive it.
Added at the beginning of the file: #include <windows.h> and in the code: SetConsoleOutputCP(1251); SetConsoleCP(1251);

Implementing multiple text file creation in function

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