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    Folder loop

    Lono9000Lono9000 Member
    edited April 2016 in General questions
    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"
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    Comments

    • piepie Member
      edited April 2016
      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 ]
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    • john26john26 Maintainer
      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)
      http://giderosmobile.com
      https://github.com/gideros/gideros
      https://www.youtube.com/c/JohnBlackburn1975
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