Bug 12740 - UIApplication.SharedApplication.RegisterForRemoteNotificationTypes() causes Crash
Summary: UIApplication.SharedApplication.RegisterForRemoteNotificationTypes() causes C...
Alias: None
Product: iOS
Classification: Xamarin
Component: XI runtime ()
Version: 6.3.x
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: 7.2.0 (iOS 7.1)
Assignee: Bugzilla
Depends on:
Reported: 2013-06-18 14:41 UTC by asp_net
Modified: 2016-01-11 21:41 UTC (History)
5 users (show)

Is this bug a regression?: ---
Last known good build:

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Description asp_net 2013-06-18 14:41:24 UTC
When calling 

    UIRemoteNotificationType.Alert |
    UIRemoteNotificationType.Badge |

somewhere within the application the app crashes after starting the debugger for the device. Even if the code isn't called.
Comment 1 Rolf Bjarne Kvinge [MSFT] 2013-06-20 09:22:08 UTC
I added that code to a test project, and it doesn't crash for me.

Can you attach a complete test project I can try out?
Comment 3 PJ 2013-11-19 16:44:49 UTC
This bug was targeted for a past milestone, moving to the next non-hotfix active milestone.
Comment 4 ilya.golovach 2014-05-13 05:46:44 UTC
I have the same issue. Testing with Xamarin.iOS

It seems that the problem is in  public override void RegisteredForRemoteNotifications (        UIApplication application, NSData deviceToken)

deviceToken	System.Exception: Could not initialize an instance of the type 'MonoTouch.Foundation.NSString': the native 'initWithDa…
Comment 5 Rolf Bjarne Kvinge [MSFT] 2014-05-13 06:11:51 UTC
Ilya, it seems you're using deviceToken.ToString () [1], which is not always guaranteed to return the correct result [2]. You need to fetch deviceToken as binary data (the easiest is probably to use deviceToken.AsStream () and read binary data from it).

[1] You probably got your code from here: http://docs.xamarin.com/guides/cross-platform/application_fundamentals/notifications/ios/remote_notifications_in_ios/, which is wrong (we know about this and a fix is in progress).

[2] An NSData does not necessarily contain data that can be converted to a string (and for this case Apple's documentation [3] explicitly states that deviceToken is 32 bytes of binary data).

[3] https://developer.apple.com/library/ios/documentation/uikit/reference/uiapplicationdelegate_protocol/Reference/Reference.html#//apple_ref/occ/intfm/UIApplicationDelegate/application:didRegisterForRemoteNotificationsWithDeviceToken:
Comment 6 ilya.golovach 2014-05-13 08:44:41 UTC
Thank you for the info. It helped. 
Some info of getting readable device token can be found here
Comment 7 GouriKumari 2016-01-11 21:41:40 UTC
BAsed on comment #5 and comment #6, I am closing this bug.