Need help with using .json for saving data

[greentumbleweed]

setting = 1
local sx, sy = guiGetScreenSize()
local dx, dy = 1920, 1080

-- GUI Window
local guiWindow = guiCreateWindow(100/sx*dx, 160/sy*dy, 200/sx*dx, 160/sy*dy, 'Shader Resolution', false, false)
local low = guiCreateRadioButton(20/sx*dx, 30/sy*dy, 150/sx*dx, 20/sy*dy, 'Low', false, guiWindow)
local medium = guiCreateRadioButton(20/sx*dx, 60/sy*dy, 150/sx*dx, 20/sy*dy, 'Medium', false, guiWindow)
local high = guiCreateRadioButton(20/sx*dx, 90/sy*dy, 150/sx*dx, 20/sy*dy, 'High', false, guiWindow)
guiSetVisible(guiWindow, false)
-- END


bindKey('F1', 'down', function()
    guiSetVisible(guiWindow, not not guiGetVisible(guiWindow))
end)

addEventHandler('onClientRender', root, function()
    if guiRadioButtonSetSelected(low) then
        setting = 1
    elseif guiRadioButtonSetSelected(medium) then
        setting = 2
    elseif guiRadioButtonSetSelected(high) then
        setting = 3
    end
end)

function gg()
    --setting = 1
    if setting == 1 then
        terrain = dxCreateTexture('image/testlow.jpg',"dxt5",true)
    elseif setting == 2 then
        terrain = dxCreateTexture('image/testmedium.jpg',"dxt5",true)33
    elseif setting == 3 then
        terrain = dxCreateTexture('image/test.jpg',"dxt5",true)
    end
        shader = dxCreateShader("fx/shader.fx")
        dxSetShaderValue(shader, 'Tex0', terrain)
        engineApplyShaderToWorldTexture(shader, 'sw_sandlod')
end
addEvent("pp",true)
addEventHandler("pp", getRootElement(), gg)
save(setting)

local myData = {}

function save()
    local file = fileOpen('save.json') or fileCreate('save.json')
    local file = fileWrite(toJSON(myData))
    fileClose(file)
end

function load()
    local file = fileOpen('save.json')
    if file then
        local buffer = fileRead(fileGetSize(file))
        myData = fromJSON(buffer)
        fileClose(file)
    end
end

load(settings)

I want to know how I can use save and load for the settings 1, 2, 3. this is a shader low, medium, high panel I've made.

[Tekken]

save(setting) -- there is no argument in that function

function save(ARGUMENT) --add the argument here:
	if ARGUMENT then --check if exists;
		local file = fileOpen('save.json') or fileCreate('save.json')
		local file = fileWrite(toJSON(ARGUMENT)); --write to file;
    	-- you should maybe save the file also ??
		fileClose(file);
    end
end

The same for load() function

 

I don't understand what it is that you want to write to the file?