Dirent attempt

/* list contents of a directory */
#include <iostream>
#include "C:\\Users\\Kimossab\\Documents\\Visual Studio 2015\\Projects\\test\\test\\dirent.h"

using namespace std;

void main(int argc, char *argv[])
{
    /* check command line arguments */
    if (argc <= 2)
    {
        fprintf(stderr, "usage: printdir directory\n");
        return;
    }

    /* print contents of directories listed in command line */
    /* open directory stream */
    DIR *dir = opendir(argv[1]);
    DIR *dir2;
    struct dirent *ent;
    struct dirent *ent2;
    string aux;

    if (dir != NULL)
    {
        /* print all the files and directories within directory */
        while ((ent = readdir(dir)) != NULL)
        {
            switch (ent->d_type)
            {
                case DT_DIR:
                    string ax = argv[1];
                    aux = ax + "\\" + ent->d_name;
                    dir2 = opendir(aux.c_str());
                    if (dir2 != NULL)
                    {
                        /* print all the files and directories within directory */
                        while ((ent2 = readdir(dir2)) != NULL)
                        {
                            switch (ent->d_type)
                            {
                                case DT_REG:
                                    cout << ent->d_name;
                            }
                        }
                        cout << ";";
                    }
                    break;
            }
        }

        closedir(dir);
    }
    else
        /* could not open directory */
        perror("");
}