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POHow to prevent iOS crash reporters from crashing MonoTouch apps?
 

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  1. POHow to prevent iOS crash reporters from crashing MonoTouch apps?
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    <p>There are plenty iOS crash reporting libraries in iOS, including <a href="https://testflightapp.com" rel="nofollow noreferrer">TestFlight</a> and <a href="http://hockeyapp.net" rel="nofollow noreferrer">HockeyApp</a>. If you don't want to depend on services, you can still use libraries like <a href="http://code.google.com/p/plcrashreporter/" rel="nofollow noreferrer">PLCrashReporter</a>. Binding these libraries is <a href="http://docs.xamarin.com/ios/Guides/Advanced_Topics/Binding_Objective-C_Libraries" rel="nofollow noreferrer">fairly trivial</a> because their public API usually consists of a couple of classes with several initialization methods.</p> <p>However, when trying to use TestFlight, and later HockeyApp in our application, our app began to randomly crash. Turns out, this <em>is</em> a known issue <a href="https://bugzilla.xamarin.com/show_bug.cgi?id=4120" rel="nofollow noreferrer">reported</a> <a href="http://monotouch.2284126.n4.nabble.com/Re-App-crashes-before-starting-td4657864.html" rel="nofollow noreferrer">several</a> <a href="https://stackoverflow.com/questions/7865374/problems-getting-testflight-to-work-with-monotouch-app/7867056#7867056">times</a>, but Xamarin doesn't warn about it, it is relatively obscure and we found it the hard way.</p> <p>We have learned that <strong>all iOS crash reporters prevent Mono from catching null reference exceptions:</strong></p> <pre><code>try { object o = null; o.GetHashCode (); } catch { // Catch block isn't called with crash reporting enabled. // Instead, the app will crash. } </code></pre> <p>Why does this happen? Quoting Rolf, a Xamarin developer,</p> <blockquote> <p>A null reference exception is actually a SIGSEGV signal at first. Usually the mono runtime handles this and translates it into a nullreference exception, allowing the execution to continue. The problem is that SIGSEGV signals are a very bad thing in ObjC apps (and when it occurs outside of managed code), so any crash reporting solution will report it as a crash (and kill the app) - this happens before MonoTouch gets a chance to handle the SIGSEGV, so there is nothing MonoTouch can do about this.</p> </blockquote> <p>I'm sure many use TestFlight in MonoTouch apps without knowing it causes crashes.<br> <a href="http://fgk.hanau.net/articles/ironic.html" rel="nofollow noreferrer">Isn't it ironic?</a> </p> <p><strong>How do you make crash reporting libraries <em>not</em> crash MonoTouch apps?</strong></p>
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    1. USDan Abramov
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    1. COIf anyone is curious, these are our [HockeyApp bindings for MonoTouch](https://github.com/stampsy/hockeyapp-monotouch). [HockeyApp](http://hockeyapp.net) is not free but their support is really good (which is something I can't say about TestFlight) and generally we've been pleased with them. I added this fix to the sample project. (Disclaimer: We're not affiliated in any way.)
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      1. USDan Abramov
 

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