Jak odczytać wszystkie pliki w folderze za pomocą C
Chcę przeczytać wszystkie pliki tekstowe w danym folderze. Nazwy plików nie mają w sobie wspólnego wzorca - inaczej zadanie byłoby łatwiejsze.
//read a file from the directory
//Perform a common operation
//write output to a common file
//read the next file
Byłoby dobrze, gdybym mógł obejść również podfoldery, ale nawet podstawowa implementacja jest wystarczająca.
Próbowałem spojrzeć na wcześniej zadawane pytania ( tutaj, proszę., tutaj i tutaj), ale żaden z nich nie daje odpowiedzi specyficznej dla C i Linuksa, którą potrzeba.
Edit: Tak więc napisałem na podstawie otrzymanych odpowiedzi -
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
int main(int argc, char **argv)
{
DIR* FD;
struct dirent* in_file;
FILE *output_file;
FILE *entry_file;
char buffer[BUFSIZ];
/* Opening common file for writing */
output_file = fopen("/home/pnp/snort_rules_folder/rulesoutput.txt", "a+");
if (output_file == NULL)
{
fprintf(stderr, "Error : Failed to open output_file\n");
return 1;
}
/* Scanning the in directory */
if (NULL == (FD = opendir ("/home/pnp/snort_rules_folder/rules")))
{
fprintf(stderr, "Error : Failed to open input directory\n");
fclose(output_file);
return 1;
}
while ((in_file = readdir(FD)))
{
/* On linux/Unix we don't want current and parent directories
* If you're on Windows machine remove this two lines
*/
if (!strcmp (in_file->d_name, "."))
continue;
if (!strcmp (in_file->d_name, ".."))
continue;
/* Open directory entry file for common operation */
/* TODO : change permissions to meet your need! */
entry_file = fopen(in_file->d_name, "r");
if (entry_file == NULL)
{
fprintf(stderr, "Error : Failed to open entry file\n");
fclose(output_file);
return 1;
}
/* Doing some stuff with entry_file : */
while (fgets(buffer, BUFSIZ, entry_file) != NULL)
{
/* Use fprintf or fwrite to write some stuff into common_file*/
}
fprintf(output_file, "reading file %s", in_file->d_name);
/* When you finish with the file, close it */
fclose(entry_file);
}
/* Don't forget to close common file before leaving */
fclose(output_file);
return 0;
}
I otrzymany błąd -
pnp@pnp-laptop:~ / snort_rules_folder$ ./ a. out
Error: Failed to open entry file
9
2 answers
Możesz użyć tego przykładowego kodu i zmodyfikować go, jeśli potrzebujesz:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
/* This is just a sample code, modify it to meet your need */
int main(int argc, char **argv)
{
DIR* FD;
struct dirent* in_file;
FILE *common_file;
FILE *entry_file;
char buffer[BUFSIZ];
/* Openiing common file for writing */
common_file = fopen(path_to_your_common_file, "w");
if (common_file == NULL)
{
fprintf(stderr, "Error : Failed to open common_file - %s\n", strerror(errno));
return 1;
}
/* Scanning the in directory */
if (NULL == (FD = opendir (in_dir)))
{
fprintf(stderr, "Error : Failed to open input directory - %s\n", strerror(errno));
fclose(common_file);
return 1;
}
while ((in_file = readdir(FD)))
{
/* On linux/Unix we don't want current and parent directories
* On windows machine too, thanks Greg Hewgill
*/
if (!strcmp (in_file->d_name, "."))
continue;
if (!strcmp (in_file->d_name, ".."))
continue;
/* Open directory entry file for common operation */
/* TODO : change permissions to meet your need! */
entry_file = fopen(in_file->d_name, "rw");
if (entry_file == NULL)
{
fprintf(stderr, "Error : Failed to open entry file - %s\n", strerror(errno));
fclose(common_file);
return 1;
}
/* Doing some struf with entry_file : */
/* For example use fgets */
while (fgets(buffer, BUFSIZ, entry_file) != NULL)
{
/* Use fprintf or fwrite to write some stuff into common_file*/
}
/* When you finish with the file, close it */
fclose(entry_file);
}
/* Don't forget to close common file before leaving */
fclose(common_file);
return 0;
}
Mam nadzieję, że to piekło.
Pozdrawiam. 11
Author: TOC,
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2012-07-31 20:47:24
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-07-31 20:47:24
To powinno zacząć:
Zobacz inne funkcje C IO.
14
Author: hmjd,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-07-31 08:31:39
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-07-31 08:31:39