Read all files in a directory?

bigtunacan · April 2016

I would like to scan a directory for all files and then read each of these in. I don't see a way to do this with the file API though.

antix · April 2016

Here's some old code I found in my projects folder, I can't rember where it originated from. Anyhoo, it should be enough to get you started down the right path

require("lfs")
workingdir="C:/"
print(workingdir.." contains:")
 
local files ={
dircount = 0,
filecount = 0,
dirlist={},
filelist={}
}
 
files.dirlist[0] = "hi there"
 
print (files.dirlist[0])
 
for file in lfs.dir(workingdir) do
  if lfs.attributes(workingdir..file,"mode") == "file" then -- process file found
    print("file: "..file)
    files.filelist[files.filecount] = file
    files.filecount = files.filecount + 1
 
  elseif lfs.attributes(workingdir..file,"mode")== "directory" then -- process dir found
    print("dir: "..file)
    files.dirlist[files.dircount] = file
    files.dircount = files.dircount + 1
  end
end
 
print()
print("DIRECTORIES (" .. files.dircount .. ")")
for f = 0, files.dircount - 1 do
  print(files.dirlist[f])
end
 
print()
print("FILES (" .. files.filecount .. ")")
for f = 0, files.filecount - 1 do
  print(files.filelist[f])
end

bigtunacan · April 2016

@antix,

I've seen the lfs project, but it looked like it wouldn't support Android/iOS; however I could be wrong about that?

antix · April 2016

@bigtunacan, I haven't tried this on an actual device but you would use a different path for Android like "|D|" and it should work.

ar2rsawseen · April 2016

Yes it won't work with absolute paths on android/ios but should work with in app paths, specifically |D| for files that you create and save

pie · April 2016

Hi
for in app paths see here http://docs.giderosmobile.com/file_system.html

In my experience you can also use:

/sdcard/ (and subdirs) in android
and
drive_letter:/ (and subdirs) on PC/windows

(check it in tntfx > "import json" or "import background" )

MoKaLux · June 2023

does lfs.dir work for you guys with html5 export?

I have this code:

function attrdir(xpath, xtable)
	if application:getDeviceInfo() == "Web" then
--		xpath = application:getNativePath(xpath)
		for file in lfs.dir(xpath) do
			local f = xpath..'/'..file
			local attr = lfs.attributes(f)
			if attr.mode == "file" then table.insert(xtable, f) end
		end
	else -- desktops
		for file in lfs.dir(xpath) do
			local f = xpath..'/'..file
			local attr = lfs.attributes(f)
			if attr.mode == "file" then table.insert(xtable, f) end
		end
	end
end
 
local t = {}
attrdir("gfx/images", t) -- folder to fetch images from

I have this error:
[string "tiled/tiled_levels.lua"]:91: cannot open gfx/images: No such file or directory
stack traceback:
[string "tiled/tiled_levels.lua"]:91: in function attrdir
[string "tiled/tiled_levels.lua"]:911: in function init
...

This works fine on android and windows.

note: I will try to add / at the end of the path

EDIT: do you have a solution to this question without using LFS?

Thank you

hgy29 · June 2023

In HTML export, all your assets are packed into a single file (the .GApp) file, so not directly visible on the pseudo FS exposed to LFS, but you have access to the GApp file itself with lua (/main.GApp), so you could read the list of all files in your app from there.
Here is the how Gideros reads it at app start: https://github.com/gideros/gideros/blob/master/emscripten/applicationmanager.cpp#L859
It should be as easy as reading the first four bytes of the GApp file into an uint32, using the value as an offset in the GApp file, and start reading zerto terminated file name strings from there, ending with an empty name.

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