Getting an error when calling get_var() in saving test

Help Programming
1

Godot Version

4.2x

Question

Im getting an error when trying to call the function get_var(). I have no idea why this is happening. im looking for someone who can help me fix that error "

Screenshot 2024-09-01 161338
Screenshot 2024-09-01 1613381355×282 35.5 KB

"
I got the code fortutorial link

Blockquote

the code I’m currently using

extends Node2D

var save_path = “user//:variable.save”

var var1 = 0
var var2 = 0
var var3 = 0

var t1
var t2
var t3

Called when the node enters the scene tree for the first time.

func _ready():
#node path to labal
t1 = $‘c0/z’
t2 = $‘c1/o’
t3 = $‘c2/t’

Called every frame. ‘delta’ is the elapsed time since the previous frame.

func _process(delta):
t1.text = str(var1)
t2.text = str(var2)
t3.text = str(var3)

func _on_save_pressed():
save()

func _on_load_pressed():
load_data()

func _on_c_0_plus_pressed():
var1 += 1
func _on_c_0_minus_pressed():
var1 -= 1
func _on_c_1_plus_pressed():
var2 += 1
func _on_c_1_minus_pressed():
var2 -= 1
func _on_c_2_plus_pressed():
var3 += 1
func _on_c_2_minus_pressed():
var3 -= 1

func save():
var file = FileAccess.open(save_path, FileAccess.WRITE)
file.store_var(var1)
file.store_var(var2)
file.store_var(var3)

func load_data():
if FileAccess.file_exists(save_path):
var file = FileAccess.open(save_path, FileAccess.READ)
var1 = file.get_var(var1)
var2 = file.get_var(var2)
var3 = file.get_var(var3)
else:
print(“nodatasaved”)
var1 = 0
var2 = 0
var3 = 0

2

It looks like FileAccess.open returned null.

I would delete the variable.save and save a new one. See if the issue continues.

If it does get_open_error will tell you why.

1 Like
3

what how do i use get_open_error
is it get_open_error()?

1 Like
4

Your path should be “user://variable.save”

To detect file errors use FileAccess.get_open_error()

var file := FileAccess.open(save_path, FileAccess.WRITE)
if file == null:
    print("Couldn't save because: ", FileAccess.get_open_error())
    return

file.store_var(var1)
file.store_var(var2)
file.store_var(var3)
2 Likes
5

@gertkeno good catch. Although i thought this would catch that?

if FileAccess.file_exists(save_path):
 ...

@sliverofstraw0_0

Since the documentation says it’s a static function you can call it like this, and get the error.

var error = FileAccess.get_open_error()

if error != OK:
	printerr("Failure! ", str(error))

Link to a list of error numbers and descriptions.

1 Like
6

The actual error they are recieving in the screenshot is null on store_var, I assume the main post is a little ahead of itself, the file won’t be created to be loaded eitherway.

7

@gertkeno , Right, but that would be because the file path was wrong, and the file didn’t exist and wasn’t opened? Or is it the fault of the : character being interpreted/filtered by Godot or the operating system?

If saving the file makes file exist return true why can’t open work?

8

The file path is the same wrong path for both saving and loading, it’s an impossible location on Windows (disallows : characters), and neither a res:// or user:// path so I think Godot doesn’t allow it without some special flags.

Since the file path is wrong no file is ever created, file is null, trying to use store_var on null produces this error

When loading, this line probably works as intended. The file path is illegal thus it cannot exist, so the rest of the load_data function loads zeros (assuming correct indentation)

if FileAccess.file_exists(save_path):
1 Like
9

Oh I’m dumb it is store var. Not get var. That makes more sense.

11

thank you so much

12

I got this error (number 12)
Error ERR_FILE_CANT_OPEN = 12
File: Can’t open error.

13

Did you see this part of my post?

14

tysm its working.
I think I skipped that part sorry

1 Like