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C Discussion Thread
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Views: 6177

Apr 12th, 2007

save file names into char array

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Hi!
I have to make a program, wich lists all files in current dir, and then save all file names into an array.
My program doesn't work ! Can you tell me why?
Thanks a lot

c Syntax (Toggle Plain Text)
#include <dirent.h> 
#include <stdio.h> 
#include <string.h> 
#include <stdlib.h>
#include <dirent.h>
int main(void)
{ FILE *fp;
  DIR           *d;
  struct dirent *dir;
  char *filenames[20];
  int i=0;
  int k,l;
  d = opendir(".");
  if (d)
  {
 
    while ((dir = readdir(d)) != NULL)
    {
 
      filenames[i]=(dir->d_name);
      printf("%d",i);
      printf(filenames[i]);
      printf("\n");
      i++;
 
    }
 
    closedir(d);
  }
  printf(filenames[3]);
 
 
// *filenames[i]='\0';
  system ("pause");
  return(0);
#include <dirent.h> 
#include <stdio.h> 
#include <string.h> 
#include <stdlib.h>
#include <dirent.h>
int main(void)
{ FILE *fp;
  DIR           *d;
  struct dirent *dir;
  char *filenames[20];
  int i=0;
  int k,l;
  d = opendir(".");
  if (d)
  {
  
    while ((dir = readdir(d)) != NULL)
    {
      
      filenames[i]=(dir->d_name);
      printf("%d",i);
      printf(filenames[i]);
      printf("\n");
      i++;
      
    }

    closedir(d);
  }
  printf(filenames[3]);
 
 
// *filenames[i]='\0';
  system ("pause");
  return(0);

Last edited by WaltP; Apr 12th, 2007 at 3:54 pm. Reason: Added CODE tags -- you actually typed right over what they are when you entered this post...

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Apr 12th, 2007

Re: save file names into char array

http://www.siit.tu.ac.th/mdailey/cla...ents/readdir.c

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Apr 12th, 2007

Re: save file names into char array

>char *filenames[20];

And what happens if you have more than 20 files there?

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Apr 12th, 2007

Re: save file names into char array

Click to Expand / Collapse Quote originally posted by iamthwee ...

>char *filenames[20];

And what happens if you have more than 20 files there?

I don't know how to make it to work for unspecified number of files

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Apr 12th, 2007

Re: save file names into char array

Click to Expand / Collapse Quote originally posted by jasssvj ...

Hi!
I have to make a program, wich lists all files in current dir, and then save all file names into an array.
My program doesn't work ! Can you tell me why?

You need to tell us why you think it's wrong? We don't know the symptoms you're seeing.

One thing I notice though is you are not saving the file name correctly. Once you read the second file, the first name is gone. You need to move the entire name into your list, not just the pointer. Be sure you redefine filenames so it can hold the string properly.

WaltP

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Apr 13th, 2007

Re: save file names into char array

Click to Expand / Collapse Quote originally posted by WaltP ...

You need to tell us why you think it's wrong? We don't know the symptoms you're seeing.

One thing I notice though is you are not saving the file name correctly. Once you read the second file, the first name is gone. You need to move the entire name into your list, not just the pointer. Be sure you redefine filenames so it can hold the string properly.

Yes this is the problem,thanks a lot

jasssvj

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Dec 4th, 2007

Re: save file names into char array

Click to Expand / Collapse Quote originally posted by WaltP ...

One thing I notice though is you are not saving the file name correctly. Once you read the second file, the first name is gone. You need to move the entire name into your list, not just the pointer. Be sure you redefine filenames so it can hold the string properly.

Could you please explain to me how this is done? I wanted to save some file names into an array so I could manipulate the text in the files, but I can't get past this problem and I have tried to save the entire name in the array but I continually get casting messages and segmentation faults. It runs as is, but the array only contains the last file name. I'm using the same program from above...

vonzul

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Dec 4th, 2007

Re: save file names into char array

Only if you'll bother to read The Rules as requested when you registered, and the post entitled Read Me: Read This Before Posting. Also, please tell us what we could have done to express the importance of reading the rules first?

WaltP

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