Hello! How to use data from File in Kotlin and delete the information after? I get OutOfMemoryExcetion. I send data every 5 seconds from the File to the server. The data all the time is updated. Then need to remove the data. Now I have this :

val bytes = fileOut.readBytes().sliceArray(range)

And then I send the bytes. I do nothing with this after. As I understand JVM garbage collector should clean this data myself after a while but does it not always. I google this, I think I can use something like try-with-resources in Java -

use

. But this extension is unable for the Class. Do you have some advice for me? Thanks.

How large is the file? Right now you're reading the entirety of it into memory and then you slice a part of it, maybe look into a way to only read a part from the start?

It can be 2 gb or more file. I have just found info :

This method is not recommended on huge files. It has an internal limitation of 2 GB byte array size.

Yeah it's not actually running out of memory, it's just that arrays in Java have maximum size.

I have a file and I need to get some part of the file and send to server. The part of the file all time is different. It can be on the beginning of the file and it can be the end of the file.

You can use some combination of InputStream.skip/read, or use

DataInputStream

which is a bit more ergonomic:

val file = FileInputStream("test.txt")
val data = DataInputStream(file)

val result = ByteArray(100)
data.readFully(result, 1000, result.size)

is it 'easy' for JVM ?

Well this should directly use the low level file apis, so there's no garbage generated for the JVM to clean up if that's what you mean.

ok, thank you, I will try this

Did you see this: https://kotlinlang.org/docs/tutorials/kotlin-for-py/file-io.html /

That documentation is wrong,

file.read(bytes)

does not read 16 bytes, it reads up to 16 bytes.