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Reply From: |
Zylann |
The documentation explain both how to read and write data and how to use it in a way it restores the game to its previous state.
Here is a simplified example on how to save and load variables in a file:
(This was in Godot 2.1, but it’s not much different in 3.1, use to_json(data) instead of data.to_json())
Save variables
# Construct a dictionary with whatever data you want
var data = {
player_level = 42,
last_item = "sword"
}
# Open a file
var file = File.new()
if file.open("user://saved_game.sav", File.WRITE) != 0:
print("Error opening file")
return
# Save the dictionary as JSON (or whatever you want, JSON is convenient here because it's built-in)
file.store_line(data.to_json())
file.close()
Load variables
# Check if there is a saved file
var file = File.new()
if not file.file_exists("user://saved_game.sav"):
print("No file saved!")
return
# Open existing file
if file.open("user://saved_game.sav", File.READ) != 0:
print("Error opening file")
return
# Get the data
var data = {}
data.parse_json(file.get_line())
# Then do what you want with the data
The path begins with “user://” so it targets a standard writable folder in the home of the user no matter which platform/OS the game runs on. For example on Windows it’s “AppData/Local/Godot/…”
Thank you for the answer. The saving is working very well but when i call the loading function on the start is not reading the vars, they start from beginning
For example i have :
var data = {apple = 1, pear = 1}
i press one button and the fruits increase by one and on the saving file i have
{“apple”:2, “pear”:2}
when i start the game again i have one apple and one pear
Did you saved the vars before quitting the game after you increased the numbers?
Zylann | 2016-07-28 17:55
Yes, in the save_file.sav are the correct numbers
I wonder, has Godot changed since this was written?
I’ve just done an exact copy/paste of this and nothing happens. No error logging, no file created, no data written etc.
func _on_ButtonSave_pressed():
# Construct a dictionary with whatever data you want
var data = {
player_level = 42,
last_item = "sword"
}
# Open a file
var file = File.new()
if file.open("user://saved_game.txt", File.WRITE) != 0:
print("Error opening file")
return
# Save the dictionary as JSON (or whatever you want, JSON is convenient here because it's built-in)
file.store_line(data.to_json())
file.close()
Robster | 2017-04-17 04:38
Did it print “Error opening file”?
Zylann | 2017-04-17 19:08
No output of any kind. I’m on the latest Godot build from the website and running OSX if that makes any difference?
Robster | 2017-04-17 21:36
Are you checking under the same folder as usual? (it won’t output next to the executable, but in a user writable directory. I don’t know where it is on OSX though).
Otherwise it might be a bug, are you using 2.1.3? Is your code working in 2.1.2?
Zylann | 2017-04-17 21:55
2.1.3 and I found it!
The files ARE being written and are being saved to:
/Users/username/.godot/app_userdata/
It’s a hidden directory so I had to show hidden files to see it.
Thanks for your suggestion and hopefully that helps anyone in the future…
Robster | 2017-04-18 09:42
I have implemented a working savegame system on my game thanks to this answer!!!
I’ve learned a lot!
Thank you very much Zylann!!!
Danicano | 2017-06-22 12:03
Thank you so much sir you saved my life
reguig | 2017-09-29 15:22
is it possible to change the file path?
You can choose a raw path if you like, for example saves/thing.save which will be next to the executable, or C:/game/thing.save, provided those folders exist or were created by the game. However, it is recommended to use the path in user:// because other paths might not be allowed on some platforms.
Zylann | 2019-06-30 15:33
I ran into some issues with the parsing function in godot V3.2
########Problem############
Get the data
var data = {}
data.parse_json(file.get_line())
######Solution########
Get the data
var data = parse_json(file.get_line())
##########################################################
Happy Game making !
