How to read all files in a folder using C

by

You can use this sample code and modify it if you need:

#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;
}

Hope this hellp.

Regards.

More Related Contents:

  1. how to enter a function to a file in c
  2. How do you determine the size of a file in C?
  3. Retrieve filename from file descriptor in C
  4. what’s the differences between r and rb in fopen
  5. How do you do non-blocking console I/O on Linux in C?
  6. Why does stat fail using a name from readdir? [duplicate]
  7. Creating a new directory in C
  8. How do you get a directory listing in C?
  9. How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?
  10. Read from file or stdin
  11. fcntl, lockf, which is better to use for file locking?
  12. plain C: opening a directory with fopen()
  13. How can I get a text file into a string but whith the “\n” in C?
  14. Reading and analyzing rooms from text file
  15. How to make child process die after parent exits?
  16. What is time_t ultimately a typedef to?
  17. What is the equivalent to Posix popen() in the Win32 API?
  18. How to recursively list directories in C on Linux?
  19. Why does this program print “forked!” 4 times?
  20. How does kernel get an executable binary file running under linux?
  21. POSIX API call to list all the pthreads running in a process
  22. Building a kernel module from several source files which one of them has the same name as the module
  23. Turn a simple socket into an SSL socket
  24. How to check if a given file descriptor stored in a variable is still valid?
  25. how to call function in executable from my library?
  26. Problems with SO_BINDTODEVICE Linux socket option
  27. How do I pass a command line argument while starting up GDB in Linux? [duplicate]
  28. How to skip a line when fscanning a text file?
  29. Process Linkage Table and Global Offset Table
  30. How to print exact value of the program counter in C

Leave a Comment