How to write a file to local using IEnumerator?

Questions & Answers
1

In my project, I need to write a big size file (about 2MB) to the persistantDataPath, and every time it does writing, the frame will drop, there is a slight lag, because I write it in one frame.
Is there any way to write a file using WWW or some other IEnumerator? so that I can use coroutine to do it.

I tried POST using WWW, it doesn’t work.

----------Update-----------------

I tried system.thread, and I tried multi-thread, the system will have lag, and the deltatime between lag frame is ALWAYS 1/3, that’s 0.33333333, always, no matter I’m using filestream.BeginWrite, or start a new thread with thread.start().

can someone provide a valid way to deal with it?

2

Coroutines will not help in this instance. All coroutines run on the main thread like other Unity scripts.

You could do the writing on another thread.

using System.IO;
using System.Threading;

public class Saver {
  public byte[] data;
  private string path;

  public void Save(string filePath, byte[] dataToSave) {
    path = filePath;
    data = dataToSave;
    var thread = new Thread(SaveData);
    thread.Start();
  }
  
  private void SaveData() {
    File.WriteAllBytes(path, data);
  }
}

Be careful when accessing Unity classes from the other thread. Some may even be completely inaccessible.