What the best and fast way to get list of files/dirs in the directory

	Bottom Previous Topic Next Topic
Register To Post

kas1e

Posted on: 2018/11/18 13:07 #1

Home away from home

I need to implement GetFileNamesInDirectory("some_directory"); function, which i later can just:


std::list<std::string> getnames(const char* dir)

{

    std::list<std::string> filenames;

    char **rc = GetFileNameInDirectory("directory");

    if ( *rc == NULL )

    {

        printf("Error: Failed to enumerate filenames in directory '%s'\n", dir);

        return filenames;

    }

    char **i;

    std::string file;

    for ( i = rc; *i != NULL; i++ )

    {

        file = *i;

        printf(" * We've got [%s].\n", file.c_str());

        filenames.push_back(file);

    }

        return filenames;

}

And it should work on public versions of os4 (at least on FE), so no beta DOS's stuff can be used. How do it the best ?

Thanks

Join us to improve dopus5!
AmigaOS4 on youtube

billyfish

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/18 14:43 #2

Just popping in

Something like this?


std::list<std::string> *getnames (const char* dir) 

{

    std::list<std::string> *filenames = new std::list<std::string>;

    struct ExamineData *data_p = IDOS->ExamineObjectTags (EX_StringNameInput, dir, TAG_END);

    

    if (data_p)

        {

            if (EXD_IS_DIRECTORY (data_p))

                {

                    APTR context_p = IDOS->ObtainDirContextTags (EX_StringNameInput, dir,

                        EX_DataFields, (EXF_NAME | EXF_LINK | EXF_TYPE),

                        TAG_END);

                

                    if (context_p)

                        {

                            struct ExamineData *dat_p;



                            /*

                                context_p takes care of deleting the returned dat_p objects

                                when we call ReleaseDirContext, so we mustn't call 

                                FreeDosObject on them

                            */

                            while ((dat_p = IDOS->ExamineDir (context_p)))

                                {

                                    if (EXD_IS_FILE (dat_p))

                                        {

                                            filenames -> push_back (dat_p -> Name);        

                                        }

                                }

                

                            if (ERROR_NO_MORE_ENTRIES == IDOS->IoErr ())

                                {

                                    success = TRUE;           /* normal exit */

                                }

                            else

                                {

                                    IDOS->Printf ("Failed to obtain directory context for "%s"\n", dir);

                                    IDOS->PrintFault (IDOS->IoErr (), NULL); /* failure - why ? */

                                }                        

                                            

                            IDOS->ReleaseDirContext (context_p);          /* NULL safe */

                        }        /* if (context_p) */

                    else

                        {

                            IDOS->Printf ("oops\n");

                            IDOS->PrintFault (IDOS->IoErr (), NULL);  /* no context - why ? */

                        }                    

                    

                }        /* if (EXD_IS_DIRECTORY (data_p)) */    

        

            IDOS->FreeDosObject (DOS_EXAMINEDATA, data_p);

        }        /* if (data_p) */



    return filenames;

}

kas1e

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/18 16:06 #3

Home away from home

Thanks, but getnames should be stay as it, its GetFileNameInDirectory i need to implement, which will return it all to char **rc

Join us to improve dopus5!
AmigaOS4 on youtube

Rigo

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/18 21:04 #4

Supreme Council

There appears to be some source you can use here:

https://tpgit.github.io/Leptonica/sarray_8c_source.html

Line 1778 starts the function you need...

Simon

Comments made in any post are personal opinion, and are in no-way representative of any commercial entity unless specifically stated as such.
----
http://codebench.co.uk

nubechecorre

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/19 8:03 #5

Just can't stay away

@Rigo

is this library available also for amigaos4?

billyfish

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/19 14:20 #6

Just popping in

@kas1e


char **GetFileNameInDirectory (const char* dir) 

{

    char **filenames_pp = NULL;

    struct ExamineData *data_p = IDOS->ExamineObjectTags (EX_StringNameInput, dir, TAG_END);

    

    if (data_p)

        {

            if (EXD_IS_DIRECTORY (data_p))

                {

                    APTR context_p = IDOS->ObtainDirContextTags (EX_StringNameInput, dir,

                        EX_DataFields, (EXF_NAME | EXF_LINK | EXF_TYPE),

                        TAG_END);

                

                    if (context_p)

                        {

              struct List *names_p = IExec->AllocSysObjectTags (ASOT_LIST, TAG_DONE);



              if (names_p)

                {

                  struct ExamineData *dat_p;

                  size_t num_entries = 0;



                                /*

                                    context_p takes care of deleting the returned dat_p objects

                                    when we call ReleaseDirContext, so we mustn't call 

                                    FreeDosObject on them

                                */

                                while ((dat_p = IDOS->ExamineDir (context_p)))

                                    {

                                        if (EXD_IS_FILE (dat_p))

                                            {

                          char *copied_name_p = CopyToNewString (dat_p -> Name);



                          if (copied_name_p)

                            {

                              struct Node *node_p = IExec->AllocSysObjectTags (ASOT_NODE,

                                                      ASONODE_Name, copied_name_p,

                                                      ASONODE_Size, sizeof (struct Node),

                                                    TAG_DONE);       

                                                

                                                  if (node_p)

                                                      {

                                                        IExec->AddTail (names_p, node_p);

                                  ++ num_entries;

                                                      }

                                                  }

                                              }

                                    }

                    

                                if (ERROR_NO_MORE_ENTRIES != IDOS->IoErr ())

                                    {

                                        IDOS->Printf ("Failed to obtain directory context for "%s"n", dir);

                                        IDOS->PrintFault (IDOS->IoErr (), NULL); /* failure - why ? */

                                    }                        

                  else

                    {

                      filenames_pp = (char **) IExec->AllocVecTags (num_entries * sizeof (char *), TAG_DONE);



                      if (filenames_pp)

                        {

                          char *current_filename_pp = filenames_pp;

                          struct Node *node_p = IExec->GetHead (names_p);

                          struct Node *next_node_p = NULL;



                            while (node_p)

                                {

                                    if (node_p -> ln_Name)

                                        {

                                  *current_filename_pp = node_p -> ln_Name;



                                  ++ current_filename_pp;

                                            (node_p -> ln_Name = NULL;

                                        }



                                    next_node_p = IExec->GetSucc (node_p);

                                    IExec->FreeSysObject (ASOT_NODE, node_p);

                                    node_p = next_node_p;

                                }



                        }



                    }



                  IExec->FreeSysObject (ASOT_LIST, (APTR) list_p);

                }

                                        

                            IDOS->ReleaseDirContext (context_p);          /* NULL safe */

                        }        /* if (context_p) */

                    else

                        {

                            IDOS->Printf ("oopsn");

                            IDOS->PrintFault (IDOS->IoErr (), NULL);  /* no context - why ? */

                        }                    

                    

                }        /* if (EXD_IS_DIRECTORY (data_p)) */    

        

            IDOS->FreeDosObject (DOS_EXAMINEDATA, data_p);

        }        /* if (data_p) */



    return filenames_pp;

}





char *CopyToNewString (const char *src_p)

{

  char *dest_p = NULL;



  if (src_p)

    {

      size_t len = strlen (src_p);

        dest_p = (char *) IExec->AllocVecTags (len + 1, TAG_DONE);



        if (dest_p)

            {

                strcpy (dest_p, start_p);

            }

     }

  

  return dest_p;

}

kas1e

Re: What the best and fast way to get list of files/dirs in the directory

Posted on: 2018/11/19 15:05 #7

Home away from home

@all
Thanks, it helps !

Join us to improve dopus5!
AmigaOS4 on youtube

Register To Post
	Top Previous Topic Next Topic

Currently Active Users Viewing This Thread: 1 ( 0 members and 1 Anonymous Users )