Folder loop

Lono9000

Hi guys! I am really new to lua and I know this may be a very basic question but how do I loop through a folder and do something in pairs with every element? ... For example if I want to change the scale of every bitmap in the folder "Example"

pie

Hi @Lono9000 you need to use lfs to read directory content:
http://docs.giderosmobile.com/reference/plugin/lfs , i think it's enabled by default in the latest gideros release.
put each entry in a table, then parse the table with pairs/ipairs.

This is how it happens in tntfx

function retrieveFiles(directory, ext) --ext: "json", "png"... require "lfs"   local function getBasenameAndExtension(filename) return filename:match("^([^%.]*)%.?(.*)$") -- "myfile.lua" -> "myfile", "lua" end   local files = {} for file in lfs.dir(directory) do if lfs.attributes(file,"mode")== "directory" then print("found dir, "..file) else if ext then --if extension is given, return only files.ext local filebasename, fileextension = getBasenameAndExtension(file)   if fileextension == ext then table.insert(files, file) end else table.insert(files, file) end end end return files end     local ftab = retrieveFiles("|R|Example/", "bmp") --ftab is just a list of file names --|R| is assuming that your Example dir is in root of your gideros project   --do something on your list for i,k in pairs(ftab) do print(i,k) --create each bitmap object, scale it etc... end

You can use as base directory /sdcard/, windows drive letters (C:/dir/...) and |R|,|D|,|T| (http://docs.giderosmobile.com/file_system.html)
[edit: sorry pasted the wrong code snippet the first time ]

john26

Maybe you can explain more what you are trying to achieve? You mean you want to alter the graphics files in a directory? So you've got a load of PNGs and JPG files and you want to resize them? You realise that Gideros can draw and resize/scale Bitmaps easily (here I refer to Gideros Bitmap class which inherits from Sprite and is a major drawing class in Gideros)