LinuxQuestions.org - For those looking for a quick solution for opendir readdir

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For those looking for a quick solution for opendir readdir

Reading files in a directory using @c++:

It seems that "ls" causes some problems so if you read around enough @C++ developers tell you to use @opendir and @readdir.

I'm posting this here mainly because I never found a code solution that was in one piece, so I'm adding this code for some quick public searching.

Code:

#include <sys/types.h>

#include <dirent.h>



// This reads only the files and not folders

unsigned char isFile =0x8;

//unsigned char isFolder =0x4; // Reads only a folder



char buff[256] = {"."};



DIR *Dir = new DIR();

struct dirent *DirEntry;



if((Dir=opendir(buff))==NULL)

{

  printf("Error");

  exit(1);

}

else

{

  cout << "OpenDir is open" << endl;

  while(DirEntry=readdir(Dir))

  {

      if ( DirEntry->d_type == isFile)

      {

      cout <<"Found a File : " << DirEntry->d_name << endl;

      }

  }

}

Hi, nice program! Just a few notes:
1) Your program is missing main()
2)

Code:

DIR *Dir = new DIR();

if((Dir=opendir(buff))==NULL) { ... }

will cause a memory leak

3) You shouldn't mix stdio with iostream

Or to really cheat:
(note no error checks)
edit: except it doesn't really work properly, oops
need to use glob as well, I'll fix it tomorrow.

Code:

#include <stdio.h>

#include <wordexp.h>

#include <stdlib.h>



int main ()

{

        char ** p;

        wordexp_t pp;



        wordexp("~/* ./*", &pp, 0);



        printf("found : %u\n", pp.we_wordc);

        for ( p = pp.we_wordv; *p; ++p) {

                printf("file: %s\n", *p);

        }

        wordfree(&pp);

        return 0;

}

Code:

found : 29

file: /home/mark/1

file: /home/mark/2

file: /home/mark/Audio Disc.toc

file: /home/mark/Audio Disc.toc.bin

file: /home/mark/Desktop

file: /home/mark/Documents

file: /home/mark/Downloads

file: /home/mark/Music

file: /home/mark/Pictures

file: /home/mark/Public

file: /home/mark/Templates

file: /home/mark/Videos

file: /home/mark/korn

file: /home/mark/korn.c

file: /home/mark/sharon

file: /home/mark/stuff.txt

file: ./Makefile

file: ./eg

file: ./eg.c

file: ./needle

file: ./needle.cpp

file: ./readline

file: ./readline.cpp

file: ./regex

file: ./regex.cpp

file: ./wordexp

file: ./wordexp.c

@millgates - Thanks I didn't know about the stdio vs iostream issues.

@bigearsbilly - Thanks you have a better solution and can run on Centos 5 and Cygwin.
This line of code can compile and run on cygwin, however on Centos 5 it can't compile.

Code:

DIR *Dir = new DIR();

@bigearsbilly - Thanks again.

Don't thank me too soon, it doesn't quite work.
If one does say '*.c' and there's no match still it will
print '*.c'

so it needs a further glob to work properly.