Using the Datastorage Mod

[LoseTheGame]

Hi guys,

I can't figure out how to use the datastorage mod based on the README:

https://github.com/minetest-technic/datastorage

All I need to know for now is how to save a value so that I can access it after quitting and restarting the game.

Thanks :)

[addi]

i would recomend you using my datastorage mod instead, its more easier
viewtopic.php?f=9&t=9276

[LoseTheGame]

Thanks Addi, I actually found your mod yesterday but I'll try it out later today :)

[rubenwardy]

You don't have to use a mod, you can do it yourself like this:

Code: Select all

local data = {}
local data_filename = minetest.get_worldpath().."/filename.txt"

local function load_data()
	local file = io.open(data_filename, "r")
	if file then
		local table = minetest.deserialize(file:read("*all"))
		file:close()
		if type(table) == "table" then
			data = table
			return
		end
	end	
end

local function save_data()
	local file = io.open(data_filename, "w")
	if file then
		file:write(minetest.serialize(data))
		file:close()
	end
end

load_data()

[LoseTheGame]

Thanks Ruben, that would be ideal if I could do it without using a mod. Could you give me a few pointers for how to get this to work? I have an integer variable called "gold" that stores how many points the character has. I've pasted in your code and made it so when the amount of gold changes it runs save_data(). Nothing seems to be being saved though and in the text file (I've called it datastorage.txt) all I can see is:

return { }

[rubenwardy]

Try this:

Code: Select all

local function load_data(filename)
	local file = io.open(filename, "r")
	if file then
		local table = minetest.deserialize(file:read("*all"))
		file:close()
		if type(table) == "table" then
			return table
		end
	end   
end

local function save_data(filename, data)
	local file = io.open(filename, "w")
	if file then
		file:write(minetest.serialize(data))
		file:close()
	end
end

local mydata = load_data(minetest.get_worldpath().."/filename.txt") or {} -- loads file if it exists, or makes empty table
mydata.foo = "bar"
save_data(minetest.get_worldpath().."/filename.txt", mydata)

[LoseTheGame]

That's working, thanks a lot! I'm making a mod for my students to learn about adding fractions so they'll be very happy :)