Re: Acquiring all files in a folder

[Garrett Kajmowicz]

On Wed, 01 Dec 2004 16:24:50 -0800, jakevoytko wrote:

> I am working with a group to write a program that organizes mp3 files
> in a root folder based on tag criteria. The tag readers are written,
> we are having trouble finding g++ documentation on reading all files
> in a folder, and deciding which files are mp3's. Any help will be
> appreciated.

What you want to do is not specific to g++, but is an operating-system
specific feature.  Here is some code which does (sort of) what you want. 
I hacked this apart from a library loading routine I wrote, so it may need
a little tweaking and look a little ugly.

//Needed for Unix library routines - cross platform how?
// Conforms to POSIX 1003.1-2003
#include <dlfcn.h>

#include <sys/types.h>
#include <dirent.h>

std::vector<std::string> openModules(const std::string path){
  std::vector<std::string> retval;

  //Open up the required directory to search for modules
  printf("Loading libraries from: %s\n", path.c_str() );
  DIR * d = opendir(path.c_str());
  if(d == NULL){
    return retval;
  }

  struct dirent * f;
  
//Get the name of each file
  do{
    f = readdir(d);
    if(f != 0 ){
      int stringlength = strlen(f->d_name);

      //Check to make sure that the file extansion is ".mp3"
      if( strncmp(f->d_name + stringlength - 4, ".mp3", 4) == 0 ){
        std::string filename = path + "/";
        filename += f->d_name;

        //Check to make sure that the file actually contains mp3 data - how?
        if( test_function(filename.c_str()) ){
                retval.push_back(filename);
        }
      }
    }
  }while(f != 0);
  return retval;
}

The code listed will return a listing of all files in a directory which
are mp3 files.

-       Garrett Kajmowicz