En bash:

$ for i in *; do echo $i; done


Fuente: nfosolutions.com

En C:

 * Esempio che scansiona una cartella stampando a video i file in essa
 * contenuti.


int main(int argc, char *argv[])
    DIR *dir;
    struct dirent *drent;

    if(argc < 2)
        fprintf(stderr, "%s \n", argv[0]);
        return EXIT_FAILURE;

    if((dir = opendir(argv[1])) == NULL)
        fprintf(stderr, "Errore opendir()\n");
        return EXIT_FAILURE;

    while((drent = readdir(dir)) != NULL)
        fprintf(stdout, "--> %s\n", drent->d_name);

    if(closedir(dir) < 0)
        fprintf(stderr, "Errore closedir()\n");
        return EXIT_FAILURE;

En Python:

import os
def ls(d):
   if os.path.isdir(d):
      for f in os.listdir(d):
         print "%s%s" % (f, "/" if os.path.isdir(f) else "")

En Python utilizando un generador que devuelve un resultado cada vez:

import subprocess
def listdirx(dirname='.', cmd='ls'):
    proc = subprocess.Popen([cmd, dirname], stdout=subprocess.PIPE)
    filename = proc.stdout.readline()
    while filename != '':
        yield filename.rstrip('\n')
        filename = proc.stdout.readline()

Una alternativa a listdir usando ctypes y opendir, readdir:

An equivalent os.listdir but as a generator using ctypes

from ctypes import CDLL, c_char_p, c_int, c_long, c_ushort, c_byte, c_char, Structure, POINTER
from ctypes.util import find_library

class c_dir(Structure):
    """Opaque type for directory entries, corresponds to struct DIR"""

class c_dirent(Structure):
    """Directory entry"""
    # FIXME not sure these are the exactly correct types!
    _fields_ = (
        ('d_ino', c_long), # inode number
        ('d_off', c_long), # offset to the next dirent
        ('d_reclen', c_ushort), # length of this record
        ('d_type', c_byte), # type of file; not supported by all file system types
        ('d_name', c_char * 4096) # filename
c_dirent_p = POINTER(c_dirent)

c_lib = CDLL(find_library("c"))
opendir = c_lib.opendir
opendir.argtypes = [c_char_p]
opendir.restype = c_dir_p

# FIXME Should probably use readdir_r here
readdir = c_lib.readdir
readdir.argtypes = [c_dir_p]
readdir.restype = c_dirent_p

closedir = c_lib.closedir
closedir.argtypes = [c_dir_p]
closedir.restype = c_int

def listdir(path):
    A generator to return the names of files in the directory passed in
    dir_p = opendir(".")
        while True:
            p = readdir(dir_p)
            if not p:
            name = p.contents.d_name
            if name not in (".", ".."):
                yield name

if __name__ == "__main__":
    for name in listdir("."):
        print name

Entradas relacionadas