Read contents of files inside a directory

read-dir-files.cpp

//
//  main.cpp
//  cpp-read-files
//
//  Created by Abbas Mashayekh on 10/1/1393 AP.
//  Copyright (c) 1393 Abbas Mashayekh. All rights reserved.
//

#include <iostream>
#include <dirent.h>
#include <fstream>

using namespace std;

// Burrowed from "strlib.h" provided by The Stanford C++ Libraries;
// http://stanford.edu/~stepp/cppdoc/
bool startsWith(const std::string& str, char prefix) {
    return str.length() > 0 && str[0] == prefix;
}

bool startsWith(const std::string& str, const std::string& prefix) {
    if (str.length() < prefix.length()) return false;
    int nChars = prefix.length();
    for (int i = 0; i < nChars; i++) {
        if (str[i] != prefix[i]) return false;
    }
    return true;
}

void read_file(string path) {
    ifstream ifs;
    ifs.open(path);
    
    char* buf = new char[1024];
    
    while(!ifs.eof()) {
        ifs.read(buf, 1024);
        cout << buf;
    }
    cout << "\n\n";
}

int main(int argc, const char * argv[]) {
    DIR *dir;
    struct dirent *ent;
    
    string root_path = "/Users/abbas/Projects/cpp-fs-test/data/";
    
    if ((dir = opendir(root_path.c_str())) != NULL) {
        while ((ent = readdir(dir)) != NULL) {
            if (!startsWith(ent->d_name, '.')) {
                cout << root_path + ent->d_name << endl;
                read_file(root_path + ent->d_name);
            }
        }
    }

    return 0;
}

Sample output:

/Users/abbas/Projects/cpp-fs-test/data/data.txt
01 21 21 1F E1 8B 90 10
41 FF FF FF 00 00 08 D8
89 0A 0C CC 67 99 19 54

/Users/abbas/Projects/cpp-fs-test/data/salam.txt
salam
chetori
halet khoobe?

On Windows, you can use this light-weight implementation of POSIX dirent.h:

http://www.two-sdg.demon.co.uk/curbralan/code/dirent/dirent.html