LÖVE • filesystem.load not working?

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filesystem.load not working?

Posted: Tue Sep 23, 2014 1:49 am

by Blank

Hi there. My name is Blank, and I recently found LÖVE and I really thought it looked neat and simple, seeing as I have no past experience with LUA at all, and have only coded in GML. I am currently following a tutorial on youtube for LÖVE and I came across this problem with the code. I swear I have written everything correctly thus far, and I don't understand why this is not working.

I have set up an entities file for all of my projects objects, and have them loaded into the game when needed. Like the tutorial, I made a box object, suitably calling it 'box.lua' and giving it some properties.

part of main.lua

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function love.load()
	require ('entities')
	love.graphics.setBackgroundColor( 198,241,255 ) -- Red / Green / Blue
	imagePlayer = love.graphics.newImage("sprites/mero1.png")
	imageTiles = love.graphics.newImage("tiles/testtiles.png")
	
	local boxEnt = ents.Create( "box", 128, 128)
end

As you can see, I have 'boxEnt' loading my object from my 'entities.lua' file.

part of entities.lua

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ents = {}
ents.objects = {}
ents.objpath = "objects."

local register = {}
local id = 0

function ents.Startup()
	register["box"] = love.filesystem.load( "objects.box.lua" )
end

function ents.Derive(name)
		return love.filesystem.load( ents.objpath .. name .. ".lua" ) ()
end

The game loads fine, but like the tutorial, I have set up the script to throw me an error message in the command window if it does not load, and upon loading the game it tells me "Error: Entity box does not exist!" even though it DOES exists.

I have checked my filenames, directory names and everything and I just can't seem to figure this out.

Re: filesystem.load not working?

Posted: Tue Sep 23, 2014 6:59 am

by bartbes

It seems you forgot to call the function returned by load when trying to load objects.box.lua, is that the problem?

Re: filesystem.load not working?

Posted: Wed Sep 24, 2014 8:43 am

by artofwork

1st problem is you never call ents.Startup() in love.load

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function love.load()
	require ('entities')
	love.graphics.setBackgroundColor( 198,241,255 ) -- Red / Green / Blue
	imagePlayer = love.graphics.newImage("sprites/mero1.png")
	imageTiles = love.graphics.newImage("tiles/testtiles.png")
	ents.Startup()
	local boxEnt = ents.Create( "box", 128, 128)
end

2nd problem is you need to change this

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register["box"] = love.filesystem.load( "objects.box.lua" )

to this

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register["box"] = love.filesystem.load( "/objects/box.lua" )

Now you get an error which is a good thing because it tells you that the change you made found what you were looking to load

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entities:26: attempt to call an upvalue 'register' (a table value)

To fix that you need to change this

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local ent = register(name) ()

to this

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local ent = register[name] ()

Then you get a new error

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entities: 13: attempt to call a nil value

In order to fix that we look at 13 which is

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return love.filesystem.load( ents.objpath .. name .. ".lua" ) ()

so we leave 13 alone, but make changes to the thing assigned to ents.objpath

from this

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ents.objpath = "objects."

to this

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ents.objpath = "/objects/"

Now we get a new error

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/objects/box.lua: 19: attempt to perform aithmetic on local 'dt' (a nil value)

We look at 19 in box.lua and see

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self.y = self.y + 32*dt

The problem isn't in 19 of box.lua its on line 18 of main.lua

The reason we know the error is in on line 18 of main.lua is because of the code on box.lua line 18

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function ent:update(dt)

main.lua line 18

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	ents.update(dt)

So we change line 18 of main from this

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	ents.update(dt)

to this

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	ents:update(dt)

And there are no more errors, Good Luck!