Can't load json on desktop instant game but works fine on mobile.

pm1891 · June 2019

Hi everyone.
At the start of the game, I'm loading settings parameters from a json file. If the file is not present, then the file is created and then loaded. I'm using the datasaver module from github. Now the process works fine on the mobile version but doesn't seem to work on desktop. I've tried using both firefox and chrome. This has completely stumped me.
Any and all help deeply appreciated.

MoKaLux · June 2019

hello @pm1891 this is my code
~~You just need to add JSON in Plugins.~~

json class:

require "json"
 
function saveData(filepath, value)
	local contents = json.encode(value)
	local file = io.open("|D|"..filepath, "w") -- create file
	file:write(contents) -- save json string in file
	io.close(file)
end
 
function getData(filepath)
	local value
	local file = io.open("|D|"..filepath, "r")
	if file then
		local contents = file:read("*a") -- read contents
		value = json.decode(contents) -- decode json
		io.close(file)
	end
 
	return value
end
 
--[[
--try to read information
local someData = getData("someData")
 
-- if no information, create it
if not someData then
	someData = {"some text", 42}
	saveData("someData.txt", someData)
	print("Creating someData")
else
	print("Read someData", someData[1], someData[2])
end
]]

Then some global variables:

g_configfilepath = "mkgiArabMdMT1.txt"
g_language = application:getLanguage()
g_theme = "dark"
g_israndom = false
g_istimer = false
g_timerdelay = 10
g_isaudio = true
g_isgfx = true
g_issfx = true
g_istranslation = true
g_isen = true
g_level = 1
g_currentlevel = 1

Then create the json file (if it doesn't exist create it)
Note that these are global functions.

-- init prefs
local mydata = getData(g_configfilepath) -- try to read information from file
 
-- if no prefs file, create it
if not mydata then
	mydata = {g_language, g_theme, g_israndom, g_istimer, g_timerdelay, g_isaudio, g_isgfx, g_issfx, g_istranslation, g_isen, g_level}
	saveData(g_configfilepath, mydata) -- create file and save datas
else
	g_language = mydata[1]
	g_theme = mydata[2]
	g_israndom = mydata[3]
	g_istimer = mydata[4]
	g_timerdelay = mydata[5]
	g_isaudio = mydata[6]
	g_isgfx = mydata[7]
	g_issfx = mydata[8]
	g_istranslation = mydata[9]
	g_isen = mydata[10]
	g_level = mydata[11]
end

And then later in the app save new parameters to the json file:
You can call this function from anywhere in your code.

-- save prefs
function mySavePrefs(xlanguage, xtheme, xisrandom, xistimer, xtimerdelay, xisaudio, xistranslation, xlevel)
	local mydata = {xlanguage or g_language, xtheme or g_theme, xisrandom or g_israndom,
				xistimer or g_istimer, xtimerdelay or g_timerdelay, xisaudio or g_isaudio, xisgfx or g_isgfx,
				xissfx or g_issfx, xistranslation or g_istranslation, xen or g_isen, xlevel or g_level}
	saveData(g_configfilepath, mydata) -- save new datas
	g_language = mydata[1]
	g_theme = mydata[2]
	g_israndom = mydata[3]
	g_istimer = mydata[4]
	g_timerdelay = mydata[5]
	g_isaudio = mydata[6]
	g_isgfx = mydata[7]
	g_issfx = mydata[8]
	g_istranslation = mydata[9]
	g_isen = mydata[10]
	g_level = mydata[11]
end

Hope this help.
That works for me in both android and desktop.

MoKaLux · June 2019

example of calling the mySavePrefs (from parameters screen for example)

-- LISTENERS
btnTranslate:addEventListener("click", -- is translation
	function()
		-- save translation
		g_istranslation = not g_istranslation
		mySavePrefs(nil, nil, nil, nil, nil, nil, nil, nil, g_istranslation, nil, nil)
 
		if g_istranslation then
		else
		end
end)

Voilà.

antix · June 2019

I thought running in a browser meant you could not save local files?

antix · June 2019

I also use something similar to this...

Prefs = Core.class()
 
require("json")
 
function Prefs:init() -- startup
  self.effectsEnabled = true -- default prefs
  self.effectsVolume  = 0.20
  self.musicEnabled   = true
  self.musicVolume    = 0.15
  self.noAds          = false
 
  self:loadPrefs() -- load prefs file
end
 
function Prefs:savePrefs() -- save prefs file
  local file = io.open("|D|prefs.json", "w+")
  if file then
    local p = {
      effectsEnabled  = self.effectsEnabled,
      effectsVolume   = self.effectsVolume,
      musicEnabled    = self.musicEnabled,
      musicVolume     = self.musicVolume,
      noAds           = self.noAds,
    }
    file:write(json.encode(p))
    file:close()
  else
    print("PREFS: unable to open file for writing")
  end
end
 
function Prefs:loadPrefs() --load prefs file
  local file = io.open("|D|prefs.json", "r")
  if file then
    local p = json.decode(file:read( "*a" ))
    for key, value in pairs(p) do -- overwrite internal values
      self[key] = value
    end
    file:close()
  else
    self:savePrefs() -- save default prefs file
  end
end

I have extra encryption steps in my production code

Apollo14 · June 2019

@pm1891 as an option, you can store/update JSON file somewhere on web
there're services with simple api (jsonbin.io, etc)
(but probably they won't help you if you need json for every user)

pm1891 · June 2019

Thank you guys so much for taking an interest in this issue.
@MoKaLux and @antix - Thanks for providing the code snippets. I'm using something similar too to load and save game preferences which works perfectly on mobile. It's deskptop browser that I'm having trouble too. Like you mentioned @antix, saving data in a browser is pretty difficult.

Anyways, I looked around and apparently saving locally is possible in javascript using the
HTML5 localStorage Object. Any idea as to how that can be implemented using the JS plugin?

oleg · June 2019

@pm1891 http://docs.giderosmobile.com/reference/gideros/JS/eval

pm1891 · June 2019

Wow! Very fast reply.You guys are awesome.
Checking JS as I write this. Thanks for the link.

pm1891 · June 2019

Okay, so this is the code I've cobbled together. But the value I'm getting is nil. So what am I doing wrong?

--------------------------------------------------

local platform = string.lower(application:getDeviceInfo())
if platform == "web" and (not mydata.levelselect) then

JS.eval([[

var M = { name: "John", maxLevels: 500, city: "New York" };
localStorage.setItem('favouriteData', JSON.stringify(M));

]])

local data = JS.eval([[ JSON.parse(localStorage.getItem('favouriteData')); ]])
mydata.levelselect = data
--------------------------------------------
mydata.levelselect is showing a nil value.

p.s - How do I post code on this forum?

hgy29 · June 2019

JS.eval only handle string return values. Just return the JSON encoded string and decode it in lua.

pm1891 · June 2019

It's still not working. Still getting a nil value. What am I missing?

oleg · June 2019

@pm1891

oleg · June 2019

pm1891 said:
It's still not working. Still getting a nil value. What am I missing?

maybe so?
local data = JS.eval([[ localStorage.getItem('favouriteData'); ]])

pm1891 · June 2019

Already tried that. No change.

pm1891 · June 2019

Already tried that. No change.

oleg · June 2019

so it does not work?

JS.eval( localStorage.setItem('name', 'John'))
print(JS.eval( localStorage.getItem('name'))

pm1891 · June 2019

It's working on chrome but not on firefox. Haven't tried other browsers yet.

oleg · June 2019

I have not written on JS for a long time, but it seems
on FF it is necessary to write as follows:

window.localStorage;

pm1891 · June 2019

I'll try that then. Thank you so much for all your help.

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