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Writting multiple files into a folder and reading all the files in a folder

This is a discussion on Writting multiple files into a folder and reading all the files in a folder within the C++ Programming forums, part of the General Programming Boards category; I only know fstream and fprintf, both of which need a prenamed file or directory. What I want to do ...

  1. #1
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    Writting multiple files into a folder and reading all the files in a folder

    I only know fstream and fprintf, both of which need a prenamed file or directory.

    What I want to do is write multiple files, i.e. 001.txt, 002.txt.

    i would assume that this involves something like:
    Code:
    for(int o = 0; o < 100; o++)
    {
         cout << o << ".txt";
    }
    Also something that would read everything from a dynamic folder

    i.e.
    Code:
    char directory[100];
    strcpy(directory, "12345")
    and that would open/write a directory (C:\\1\2\3\4\5)

    Hope that made sense :S
    Would appreciate someone pointing me to the right direction Thanks!
    Last edited by JonathanS; 03-21-2012 at 04:30 PM.
    My Ctrl+S addiction gets in the way when using Code Blocks...

  2. #2
    - - - - - - - - oogabooga's Avatar
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    You just need to build the filename with sprintf (or whatever).
    Code:
    #include <iostream>
    #include <fstream>
    #include <cstdio>   // for sprintf
    
    int main() {
        char filename[100];
        int n = 1;
        std::sprintf(filename, "%03d.txt", n);
        std::ofstream ofs(filename);
        ofs << "yo\n";
        return 0;
    }
    To read a directory's contents you could try opendir, readdir, closedir.
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

  3. #3
    Registered User whiteflags's Avatar
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    Also, C++ has the stringstream class which works like the code you wrote Jonathan.
    Elysia likes this.

  4. #4
    C++まいる!Cをこわせ! Elysia's Avatar
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    Please avoid C-arrays, C-strings and strcpy, and its friends.
    For arrays, I recommend std::array (requires TR1; otherwise boost has it). For C-strings, use std::string. It also replaces strcpy and its friends.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  5. #5
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    Quote Originally Posted by Elysia View Post
    Please avoid C-arrays, C-strings and strcpy, and its friends.
    For arrays, I recommend std::array (requires TR1; otherwise boost has it). For C-strings, use std::string. It also replaces strcpy and its friends.
    Yeah I have been reading some more modern books on c++ and I will slowly transition into that.

    As my programming professor said "I am an old programmer in a new programmers body".
    My Ctrl+S addiction gets in the way when using Code Blocks...

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