System.TypeInitializationException happens on iOS device, not in simulator

[Anonymous]

I’m trying to make a chat app in Xamarin using NetworkComms. When testing on an iOS device rather than the simulator, I get the following exception:

System.TypeInitializationException: An exception was thrown by the type initializer for NetworkCommsDotNet.NetworkComms ---> System.Exception: Object reference not set to an instance of an object
  at NetworkCommsDotNet.DPSBase.DPSManager.CreateObjectWithParameterlessCtor (System.String typeName) [0x00034] in <filename unknown>:0
  at NetworkCommsDotNet.DPSBase.DPSManager.GetDataSerializer[ExplicitSerializer] () [0x00032] in <filename unknown>:0
  at NetworkCommsDotNet.NetworkComms..cctor () [0x00170] in <filename unknown>:0
  --- End of inner exception stack trace ---
  at Program.iOS.ViewController.InitializeServer () [0x0002c] in /…/Program/iOS/ViewController.cs:116
  at Program.iOS.ViewController.startServer_TouchUpInside (UIKit.UIButton sender) [0x00002] in /…/Program/iOS/ViewController.cs:68
  at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Users/builder/data/lanes/2320/bae2cdbe/source/maccore/src/UIKit/UIApplication.cs:77
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0001c] in /Users/builder/data/lanes/2320/bae2cdbe/source/maccore/src/UIKit/UIApplication.cs:60
  at Program.iOS.Application.Main (System.String[] args) [0x00008] in /…/Program/iOS/Main.cs:17

My program works as it should on Android devices, Android simulators and iOS simulators, but not on my iPhone for some reason. Does anyone have any ideas?

[Anonymous]

Heya Henry,

How are you initialising or attempting to retrieve a DPS manager? Have you compared your approach to the one used in the iOS chat example?

Kind regards,
Marc

[Anonymous]

Hi Marc,
I’m not sure that I’m doing that, but would that explain why it only doesn’t work on a physical iOS device?

This is the server code I’ve got:

private void StartServer()
{
NetworkComms.AppendGlobalIncomingPacketHandler<Message> ("Message", MessageHandler);
Connection.StartListening (ConnectionType.TCP, new IPEndPoint (IPAddress.Any, 0));
}

The Message class is very similar to the ChatMessage class in the example. I noticed in the ChatWindow class in the example that it has this line:
ChatApplication.Serializer = DPSManager.GetDataSerializer<NetworkCommsDotNet.DPSBase.ProtobufSerializer>();

With a variable Serializer in ChatAppBase:
public DataSerializer Serializer { get; set; }

But if I try and do the following within my ViewController class (where the rest of the code is), I get an error:
public DataSerializer Serializer = DPSManager.GetDataSerializer<NetworkCommsDotNet.DPSBase.ProtobufSerializer>();

Error, even though I’ve got NetworkCommsDotNet in my references:
The type 'NetworkCommsDotNet.DPSBase.DataSerializer' is defined in an assembly that is not referenced. Consider adding a reference to assembly 'NetworkCommsDotNet, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'

Sorry if I’m missing something basic with this, but I’m not really sure what to do.

• This reply was modified 8 years, 5 months ago by .
• This reply was modified 8 years, 5 months ago by .

[Anonymous]

It looks like you are missing references in your project. I would recommend you look at how NetworkComms.Net is referenced in the provided iOS example project and ensure you are replicated that.

Kind regards,
Marc

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