Why I can't set PoolByteArray data inside Array?

sent44

Other pool array types are not test yet. Why, Why, Why I can't modify while normal PoolByteArray variable can?

extends Node

func _ready():
	var t: Array = []
	
	var a: PoolByteArray = PoolByteArray()
	a.resize(5)
	t.append(a)
	print("Before modify array    : ", t[0].hex_encode())
	
	t[0].set(4, 128)
	print("After modify array     : ", t[0].hex_encode())
	print(" ") # Blank line
	
	var b: PoolByteArray = PoolByteArray()
	b.resize(5)
	print("Before modify variable : ", b.hex_encode())
	b.set(4, 128)
	print("After modify variable  : ", b.hex_encode())

sent44

Please, I want answer ;-;

TwistedTwigleg

I'm not sure right off, to be honest. The only thing I can think of, is when you are accessing an element in the PoolByteArray from within an Array, it is not setting it because of the indirect reference. That said, I do not think that is the issue.

Maybe try this:

var a : PoolByteArray = PoolByteArray()
a.resize(5)
t.append(a)
print("Before modify array    : ", t[0].hex_encode())

var a_from_t = t[0]
a_from_t.set(4, 128)
# test to see if it was set in a_from_t
print("a-from-t after modify array     : ", a_from_t.hex_encode())
# test if a in the t array has changed without any additional modification
print("After modify array     : ", t[0].hex_encode())
# finally, see if applying a_from_t to t fixes the issue
t[0] = a_from_t
print("After applying modify a-from-t  array     : ", t[0].hex_encode())

Outside of that, I'm not sure right off. I haven't really used PoolByteArray that much myself. If you have not already, it might not be a bad idea to also ask on other Godot channels, as there might be users there who have used PoolByteArray that can chime in with solutions.

cybereality

It doesn't appear that you can put a PoolByteArray inside a normal Array and still access/change it properly. I tried a bunch of things, it doesn't seem to work. Maybe put all the information in one huge PoolByteArray and use "subarray" to index into that.

https://docs.godotengine.org/en/stable/classes/class_poolbytearray.html

sent44

Thank both of you, @TwistedTwigleg and @cybereality . Although these solutions you advice me didn't help me much, still both of your answers answer the question correctly, thank.

Anyway, I found a workaround. I don't like this approach. But still, I think the performance is better than what you are suggests ones.

extends Node

class pool:
	var content: PoolByteArray = PoolByteArray()
	
	func _init(var size: int):
		content.resize(size)
	
	func set_data(var index: int, var data: int):
		content.set(index, data)

func _ready():
	var arr: Array = []
	arr.append(pool.new(5))
	print("Before modify           : ", arr[0].content.hex_encode())
	arr[0].content.set(4, 128) # Modify directly is still not work
	print("After modify directly   : ", arr[0].content.hex_encode())
	arr[0].set_data(4, 128) # Modify indirectly using medthod is work
	print("After modify indirectly : ", arr[0].content.hex_encode())

I hope that this will help someone who face the same issue =)

! Why is TwistedTwigleg's solution didn't work, well his solution is duplicate the whole pool array then process data and then duplicate back to array again. I am not feel like doing so when I need to modify more than 1kb of data many times :s

! Samething apply to cybereality's solution, duplicate part of array (if I read the docs correctly) not reference it and then when after I finish process data, I need to loop to put data back byte by byte.