error in mingw, dirent.h, or my programming?

[cppcub]

Hi all,

I am using PC AMD Athlon, WinXP Home SP2, and mingw32: g++ (GCC) 3.4.2 (mingw-special).

Problem:

*My program traverses a directory ("./BB"; could also be ".", does not matter) and reads the files in the directory, using tools from <dirent.h>
*During traversing, the files are printed to screen and read into an array (Allfiles[])
*However, when iterating through the array from 0 to the last entry, only the last entry is present, not the previous ones. How come?

This is a code snippet from the program:

#include <iostream>
#include <errno.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>

const int directorySize = 20; // there are less than 20 files in "./BB"
char *AllFiles[directorySize];

int main()
{   
    int Index = 0; 
    DIR *pdir;
    struct dirent *pent;

    pdir=opendir("./BB"); // open directory
    if (!pdir)
    {
        printf ("opendir() failure; terminating");
        exit(1);
    }
    errno=0;  
  
    //read directory "./BB" and put entries into AllFiles[i]
    
    Index = 0; 
    std::cout << " --- traversing directory ---: " << std::endl;
    while ((pent=readdir(pdir))) 
    {
        AllFiles[Index] = pent->d_name;     
        // test to show that filenames are in AllFiles[]
            // a) test if present entry is in array; this works fine
            std::cout << " Array " << Index << ": " << AllFiles[Index] << std::endl; 
           // b) test if previous entries are still in array; no they are not! 
           std::cout << " Reading array entries from 0 to " << Index << ": " << std::endl;
           for (int j = 0; j <= Index; j++)
           {
               std::cout << "   > j: " << j << " Array " << j << ": " << AllFiles[j];
               std::cout << std::endl; 
           } 
        Index = Index + 1;
	}
    std::cout << std::endl;
	
    // irrelevant code omitted
{

The program is a modification from
http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum=245

What am I doing wrong?

Thanks,

linuxcub

[Mythicwolf]

Im checking now, but it might be because you are storing a whole string in a character array.

wait... one sec i was wrong

[Mythicwolf]

K i got it now, same reason as just before, but it works now

// try changing 
char *AllFiles[directorySize];
// to this
std::string AllFiles[directorySize];
// or a 2 dimensional array if you want to keep it characters

// if you do change it to the string, then u have to change:
AllFiles[Index] = pent->d_name;  
//to this:
AllFiles[Index] = std::string(pent->d_name); 

[cppcub]

Thank you! :-)
I will try this when I have again access to my computer in about 2 weeks.

P.S. And I am glad that you hinted that I meant filenames (instead of files) to be read into an array.

[cppcub]

Thank you, Mythicwolf!
std::string AllFiles[directorySize];
works great :-)

cppcub