Saving and loading data files

SinisterSoft

A nice way to save load data is by using json, here is one way to do it.

First, somewhere early in your code load the json library...

pcall(function() require "json" end)

Then here is a save routine for a sample table:

function save() if json then local savedata={} savedata["highscore"]=hiscore local file=io.open("|D|data.txt","w+") if file then pcall(function() file:write(json.encode(savedata)) end) file:close() end end end

Just copy the variables you need saving into the temporary savedata table.

Alternatively you could have the savedata table outside the function and use it throughout your game.

Here is a load routine to load the table: function load() if json then local file=io.open("|D|data.txt","r") if file then local originaldata=file:read() file:close() if originaldata then local decoded=json.decode(originaldata) if decoded then hiscore=tonumber(decoded["hiscore"]) end end end end if hiscore==nil then hiscore=0 end end

Notice the check at the end to set valid values if for any reason the results are nil.

HubertRonald

Notice the check at the end to set valid values if for any reason the results are nil.

Oh! yes @SinisterSoft Sometimes also headaches come when a formula (percentage of advance or other method) of 0/0 and produces NaN See more details here: ...Json: Error reading 'null' and you try save it with json

MoKaLux

oh this is SinisterSoft who came up with this great solution, I use it everyday thank you mister SinisterSoft

PS: for ref