DaniWeb Forum Index > Software Development > C

C RSS

save file names into char array

•

Join Date: Apr 2007

Posts: 4

Reputation: jasssvj is an unknown quantity at this point

Solved Threads: 0

jasssvj

Offline

Newbie Poster

save file names into char array

Apr 12th, 2007

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

 Help with Code Tags 
 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...

•

Join Date: Feb 2007

Posts: 539

Reputation: thekashyap will become famous soon enough

Solved Threads: 50

thekashyap thekashyap is offline

Offline

Posting Pro

Re: save file names into char array

Apr 12th, 2007

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

•

Join Date: Aug 2005

Posts: 5,264

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: save file names into char array

Apr 12th, 2007

>char *filenames[20];

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

*Voted best profile in the world*

•

Join Date: Apr 2007

Posts: 4

Reputation: jasssvj is an unknown quantity at this point

Solved Threads: 0

jasssvj

Offline

Newbie Poster

Re: save file names into char array

Apr 12th, 2007

•

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

•

Join Date: May 2006

Posts: 3,114

Reputation: WaltP has much to be proud of

Solved Threads: 281

WaltP

Offline

Posting Sensei

Re: save file names into char array

Apr 12th, 2007

•

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.

The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes

•

Join Date: Apr 2007

Posts: 4

Reputation: jasssvj is an unknown quantity at this point

Solved Threads: 0

jasssvj

Offline

Newbie Poster

Re: save file names into char array

Apr 13th, 2007

•

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

•

Join Date: Nov 2007

Posts: 6

Reputation: vonzul is an unknown quantity at this point

Solved Threads: 0

vonzul

Offline

Newbie Poster

Re: save file names into char array

Dec 4th, 2007

•

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...

•

Join Date: May 2006

Posts: 3,114

Reputation: WaltP has much to be proud of

Solved Threads: 281

WaltP

Offline

Posting Sensei

Re: save file names into char array

Dec 4th, 2007

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?

The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes