Thread: getting files in directory

hi
i was wondering how to read the files in a directory.

i thought first of all i have to create a file where the files can be written to.

Code:

FILE *name;
name = fopen ("filelist.txt", "w+");
     if (name == NULL)
          printf("an error occured\n");
     else
          ...............
     fclose(name);

is there a command that checks the location of the file and writes down the files located there i.e. into a text file.

There is actually an ansi way of doing this. You should look into dirent.h. Try something like this out:

(NOTE: much of this was from "The C Programming Language")

Code:

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>

void dirwalk(char *dir, void (*fcn)(char *)) {
    char name[1024];
    struct dirent *dp;
    DIR *dfd;

    if((dfd = opendir(dir)) == NULL) {
        fprintf(stderr, "dirwalk: can't open %s\r\n", dir);
        return;
    }
    while((dp = readdir(dfd)) != NULL) {
        if(!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
            continue;

        if(strlen(dir) + strlen(dp->d_name)+2 > sizeof(name))
            fprintf(stderr, "dirwalk: name %s/%s too long\r\n", dir, dp->d_name);
        else {
            sprintf(name, "%s/%s", dir, dp->d_name);
            (*fcn)(name);
        }
    }
    closedir(dfd);
}

void fsize(char *name) {
    struct stat stbuf;

    if(stat(name, &stbuf) == -1) {
        fprintf(stderr, "fsize: can't access %s\r\n", name);
        return;
    }

    if((stbuf.st_mode & S_IFMT) == S_IFDIR) {
        dirwalk(name, fsize);
        printf("%s/\n", name);
    } else {
        printf("%8ld %s\r\n", stbuf.st_size, name);
        puts(name);
    }
}

int main(int argc, char** argv) {
    if(argc != 2) {
        printf("whatever.exe directory");
        return 1;
    }
    fsize(argv[1]);

    return 1;
}

If there is something wrong with the code (probably) just remember that this is old code that I just pulled out of a very old project and made a couple of quick changes to.

Hi,

I saw this program and decided to try to write a pretty printer for directory listings. I wrote this recursive function but for some reason it only recurses down through one directory?

Code:

 
void recursive_dir(DIR* directory,int tabs){ 
   
  if(!(directory)) { 
    error("Directory is not accesible"); 
    return; 
  } 
   
  struct dirent *dip; 
 
  while(( dip = readdir( directory ))){ 
    if(!strcmp(dip->d_name, ".") || !strcmp(dip->d_name, "..")) 
      continue; 
     
    DIR* d = opendir(dip->d_name); 
    if(d != NULL){ 
      cout << "|-**"; 
      for(int i=0;i<tabs;i++)  // Print out the tabs 
	cout << "---"; 
      cout << dip->d_name << "\n"; 
      recursive_dir(d,tabs+1); 
      closedir( d ); 
      continue; 
    } 
    
    for(int i=0;i<tabs;i++)  // Print out the tabs 
      cout << "   "; 
     
    cout << "|- " << dip->d_name << "\n";   
  } 
   
  return; 
}

Think I may have used opendir() wrong but cant see where,

thanks for any help

Brif