[C#] Load level after login async (Parse.com)

Unity Engine
1

I am a Unity beginner and I am getting stuck on a really simple thing.
I want to login using the Parse SDK and if the login returns true I want to load the menu scene.
I have a login screen with a Login button and onclick I have the following function

public void LoginParse ()
    {
        GameObject usernamebox = GameObject.Find("UsernameBox");
        InputField usernamefield = usernamebox.GetComponent<InputField>();
        GameObject passwordbox = GameObject.Find("PasswordBox");
        InputField passwordfield = passwordbox.GetComponent<InputField>();
        ParseUser.LogOut();
        AuthenticateParse (usernamefield.text, passwordfield.text);
//if there is whatever piece of code here, this makes Unity freeze   
// I would like to check if the task of Authentication is finished and if so check the current user. 
//If true then I would like to run Application.LoadLevel ("scenemenu");

     }
       
public void AuthenticateParse(string usern,string pass)
    {
        ParseUser user = null;
        ParseUser.LogInAsync(usern, pass).ContinueWith (t =>
                                                                                    {
           
            if (t.IsFaulted || t.IsCanceled) {
                //exceptions
            } else {
                user = t.Result;
            }
        });
    }

Whenever I add code after the LoginAsync call unity gets frozen and I need to end it with the task manager. What am I missing? Thank you!

2

I have a same problem. Did you find the solution?

3

The Task.CountinueWith format doesn’t really work in Unity. ContinueWith runs on the ASync thread created for the task, and so can’t access the unity API. A better method is to use a coroutine.

var loginTask = ParseUser.LoginAsync(...);
while (!loginTask.isDone) yield return null;
Application.LoadLevel(...);
4

Yes, I found the solution. Actually in Unity the Async operations are put into coroutines, but how do we handle if the function has a ContinueWith? In order to yield for the second part of the Async call we need to put a flag and a while statement to check the flag. In my case the flag is the bool current, and the code looks like this

public void AuthenticateParse(string usern,string pass)
    {
        ParseUser user = null;
        ParseUser.LogInAsync(usern, pass).ContinueWith (t =>
    {
            print ("I sent data");
            if (t.IsFaulted || t.IsCanceled) {
                print ("We could not log you in"); //write exceptions!!!
            } else {
                user = t.Result;
                current = true;

            }
        });
    }

then, to yield for the bool, we need to insert the function into a coroutine for the use of the while cycle, this way:

public bool current = false;

public IEnumerator MyCoroutineLogin ()
{
AuthenticateParse(myuser, mypass);
while (!current){
yield return null;
}
//do whatever you want after login here
}

In case, somewhere else we can just start this coroutine and always check for the flag, for example in the Start() function.