Question by Fredow0001 · Apr 29, 2021 at 12:51 PM · c#controller system threading handles

IDevice.InitializeAsync().Wait() throws I/O Exception in System.FileStream

Hey everyone,

I'm struggling with a I/O Exception when calling IDevice.InitializeAsync().Wait(); in a new thread.

I am using the Hid.Net.dll and after a bit of research I found out, that there are some general problems with SafeFileHandlers/HID in Unity. I Changed Unitys API compatibility Level to 4.x but it still didn't work.

It seems to be a problem which I cannot really influence, since the error occurs within constructors/methods of System.FileStream classes which I obviously can't change. I already tried to understand and even change some of the code snippets using dotPeek and dnSpy. So I hope that I'm wrong and the problem rather is in the setup, before even calling the constructors etc.

(Btw. I'm using the code of Mxster which natively runs in VS C#, so the problem only occurs when using his .dll in Unity.)

Here is my code so far:

Instead of a static Bootstrapping method I changed this class to have normal constructor: This code works perfectly fine, the controller is recognized!

 public Devices()
             {
                 WindowsHidDeviceFactory.Register(_logger, _tracer);
                 WindowsUsbDeviceFactory.Register(_logger, _tracer);
     
                 SearchDS5Controller();
             }
 
 
 public void SearchDS5Controller()
         {
             var devices = EnumerateDevices().Item1;
             foreach (var deviceInfo in devicesList.Where(deviceInfo => deviceInfo.Device.IsInitialized))
             {
                 deviceInfo.Close();
             }
 
             Debug.Log(devices.Count());
 
             foreach (var deviceInfo in devices)
             {
                 devicesList.Add(deviceInfo);
                 deviceInfo.Init();
             }
         }

In the above code deviceInfo.Init() calls the following function, which creates a thread starts it and calls IDevice.InitializeAsync().Wait(); This is the method that throws the exception:

  public void Init()
         {
             var thread = new Thread(() =>
             {
                 Device.InitializeAsync().Wait();
             });
             thread.Start();
             thread.Join();
 
             _timeoutCheckThread = new Thread(TimeoutTestThread);
             _timeoutCheckThread.Priority = System.Threading.ThreadPriority.BelowNormal;
             _timeoutCheckThread.Name = "DualSense Timeout thread: " + Device.DeviceId;
             _timeoutCheckThread.IsBackground = true;
             _timeoutCheckThread.Start();
         }

Exception:

IOException: Invalid handle. System.IO.FileStream.Init (Microsoft.Win32.SafeHandles.SafeFileHandle safeHandle, System.IO.FileAccess access, System.Boolean ownsHandle, System.Int32 bufferSize, System.Boolean isAsync, System.Boolean isConsoleWrapper) (at :0) System.IO.FileStream..ctor (Microsoft.Win32.SafeHandles.SafeFileHandle handle, System.IO.FileAccess access, System.Int32 bufferSize, System.Boolean isAsync) (at :0) (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(Microsoft.Win32.SafeHandles.SafeFileHandle,System.IO.FileAccess,int,bool) Hid.Net.Windows.WindowsHidApiService.OpenRead (Microsoft.Win32.SafeHandles.SafeFileHandle readSafeFileHandle, System.UInt16 readBufferSize) (at :0) Hid.Net.Windows.WindowsHidDevice.Initialize () (at :0) Hid.Net.Windows.WindowsHidDevice.b_36_0 () (at :0) System.Threading.Tasks.Task`1[TResult].InnerInvoke () (at :0) System.Threading.Tasks.Task.Execute () (at :0) --- End of stack trace from previous location where exception was thrown --- System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () (at :0) System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) (at :0) System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) (at :0) System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) (at :0) System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () (at :0) Hid.Net.Windows.WindowsHidDevice+d36.MoveNext () (at :0) Rethrow as AggregateException: One or more errors occurred. System.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) (at :0) System.Threading.Tasks.Task.Wait (System.Int32 millisecondsTimeout, System.Threading.CancellationToken cancellationToken) (at :0) System.Threading.Tasks.Task.Wait () (at :0) DualSenseSupport.DeviceInfo.b20_0 () (at Assets/Plugins/DualSenseSupport/DeviceInfo.cs:189) System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) (at :0) System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at :0) System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at :0) System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) (at :0) System.Threading.ThreadHelper.ThreadStart () (at :0) UnityEngine.<>c:b_0_0(Object, UnhandledExceptionEventArgs)

If you do have any suggestions I would appreciate a short answer!
Cheers :)

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