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kas1e
What the best and fast way to get list of files/dirs in the directory
Posted on: 2018/11/18 13:07    #1
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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
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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
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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;
}

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

is this library available also for amigaos4?

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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
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@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;
}

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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
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@all
Thanks, it helps !
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