This work-around will make your code work, but will cause your object to surface with no previous managed state, which is very very bad. The solution is trying to keep a reference to it from known live objects.
On Mon, Aug 20, 2012 at 5:45 PM, Nic Wise <n...@fastchicken.co.nz> wrote: > Make a constructor which takes an IntPtr as the single param. But it > may cause other issues, I'm not sure.... > > On Mon, Aug 20, 2012 at 9:39 PM, Dotnet Projects > <coderproje...@gmail.com> wrote: > > I have to keep all Viewcontroller in the memory. Is there anything else I > > can do? > > > > Thanks > > Art > > > > > > On Mon, Aug 20, 2012 at 3:19 PM, Nic Wise <n...@fastchicken.co.nz> > wrote: > >> > >> I'm pretty sure this is a known problem - you have let the managed > >> version (C# version) go out of scope, and it's been garbage collected. > >> The Cocoa side wants to use the object, so the runtime trys to make > >> the managed version again - but it can't as it doesn't have an IntPtr > >> constructor. > >> > >> If you can work out which object is the problem, try keeping an > >> explicit reference to it. > >> > >> On Mon, Aug 20, 2012 at 8:04 PM, Dotnet Projects > >> <coderproje...@gmail.com> wrote: > >> > I am getting the error from MonoTouch..DialogViewController too. > >> > > >> > it might be related to the linker options I am using > >> > > >> > --linkskip=mscorlib -aot "nimt-trampolines=512" > >> > > >> > > >> > > >> > at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, > IntPtr > >> > klass) [0x00000] in <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObject (IntPtr ptr) [0x00000] > in > >> > <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObjectWrapped (IntPtr ptr) > >> > [0x00000] > >> > in <filename unknown>:0 > >> > at (wrapper native-to-managed) > >> > MonoTouch.ObjCRuntime.Runtime:GetNSObjectWrapped (intptr) > >> > at MonoTouch.UIKit.UIApplication.Main (System.String[] args, > >> > System.String > >> > principalClassName, System.String delegateClassName) [0x00000] in > >> > <filename > >> > unknown>:0 > >> > at Application.Main (System.String[] args) [0x00000] in <filename > >> > unknown>:0 System.Exception: Selector invoked from objective-c on a > >> > managed > >> > object (0x73D1AD0) that has been GC'ed ---> > >> > System.MissingMethodException: > >> > No constructor found for > >> > MonoTouch.Dialog.DialogViewController::.ctor(System.IntPtr) > >> > > >> > at System.Activator.CreateInstance (System.Type type, BindingFlags > >> > bindingAttr, System.Reflection.Binder binder, System.Object[] args, > >> > System.Globalization.CultureInfo culture, System.Object[] > >> > activationAttributes) [0x00000] in <filename unknown>:0 > >> > at System.Activator.CreateInstance (System.Type type, > System.Object[] > >> > args, System.Object[] activationAttributes) [0x00000] in <filename > >> > unknown>:0 > >> > at System.Activator.CreateInstance (System.Type type, > System.Object[] > >> > args) [0x00000] in <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, > IntPtr > >> > klass) [0x00000] in <filename unknown>:0 > >> > --- End of inner exception stack trace --- > >> > at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, > IntPtr > >> > klass) [0x00000] in <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObject (IntPtr ptr) [0x00000] > in > >> > <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObjectWrapped (IntPtr ptr) > >> > [0x00000] > >> > in <filename unknown>:0 > >> > at (wrapper native-to-managed) > >> > MonoTouch.ObjCRuntime.Runtime:GetNSObjectWrapped (intptr) > >> > at MonoTouch.UIKit.UIApplication.Main (System.String[] args, > >> > System.String > >> > principalClassName, System.String delegateClassName) [0x00000] in > >> > <filename > >> > unknown>:0 > >> > at Application.Main (System.String[] args) [0x00000] in <filename > >> > unknown>:0 System.Exception: Selector invoked from objective-c on a > >> > managed > >> > object (0x73D1AD0) that has been GC'ed ---> > >> > System.MissingMethodException: > >> > No constructor found for > >> > MonoTouch.Dialog.DialogViewController::.ctor(System.IntPtr) > >> > > >> > at System.Activator.CreateInstance (System.Type type, BindingFlags > >> > bindingAttr, System.Reflection.Binder binder, System.Object[] args, > >> > System.Globalization.CultureInfo culture, System.Object[] > >> > activationAttributes) [0x00000] in <filename unknown>:0 > >> > at System.Activator.CreateInstance (System.Type type, > System.Object[] > >> > args, System.Object[] activationAttributes) [0x00000] in <filename > >> > unknown>:0 > >> > at System.Activator.CreateInstance (System.Type type, > System.Object[] > >> > args) [0x00000] in <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, > IntPtr > >> > klass) [0x00000] in <filename unknown>:0 > >> > --- End of inner exception stack trace --- > >> > at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, > IntPtr > >> > klass) [0x00000] in <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObject (IntPtr ptr) [0x00000] > in > >> > <filename unknown>:0 > >> > at MonoTouch.ObjCRuntime.Runtime.GetNSObjectWrapped (IntPtr ptr) > >> > [0x00000] > >> > in <filename unknown>:0 > >> > at (wrapper native-to-managed) > >> > MonoTouch.ObjCRuntime.Runtime:GetNSObjectWrapped (intptr) > >> > at MonoTouch.UIKit.UIApplication.Main (System.String[] args, > >> > System.String > >> > principalClassName, System.String delegateClassName) [0x00000] in > >> > <filename > >> > unknown>:0 > >> > at Application.Main (System.String[] args) [0x00000] in <filename > >> > unknown>:0 > >> > > >> > > >> > On Mon, Aug 20, 2012 at 1:53 PM, Dotnet Projects > >> > <coderproje...@gmail.com> > >> > wrote: > >> >> > >> >> Thanks for the reply. > >> >> > >> >> I am not using SGEN but I am using following linker options > >> >> > >> >> --linkskip=mscorlib -aot "nimt-trampolines=512" > >> >> > >> >> It only happens in release mode (device). Unfortunately I cannot > repeat > >> >> it > >> >> but I get logs from customer and I get same errors any where I use. > >> >> > >> >> myUIVIewControler p = new myUIVIewControler(); > >> >> > >> >> Art > >> >> > >> >> > >> >> > >> >> > >> >> On Mon, Aug 20, 2012 at 8:11 AM, René Ruppert < > rene.rupp...@gmail.com> > >> >> wrote: > >> >>> > >> >>> The code above (the first example with the local PenColor) should > NOT > >> >>> crash. PresentModalViewController is supposed to hold a managed > >> >>> reference. > >> >>> If not, I'd consider that a bug. > >> >>> I'm using code like that all the time and do not get any crashes. > I'm > >> >>> using SGen but have the experimental ref count system OFF. > >> >>> But if you're using XIBs, your controllers should really have the > >> >>> IntPtr > >> >>> constructor, as far as I know. > >> >>> > >> >>> René > >> >>> > >> >>> > >> >>> 2012/8/19 rnendel11 <rnende...@gmail.com> > >> >>>> > >> >>>> Because you're declaring at class scope vs. method scope. I'm > >> >>>> guessing > >> >>>> you > >> >>>> have SGen enabled and possibly the experimental reference count > >> >>>> option > >> >>>> as > >> >>>> well? > >> >>>> > >> >>>> I stopped using SGen myself, had GC issues and crashes. If you > have > >> >>>> those > >> >>>> options enabled, try without them enabled. Also, I'm not entirely > >> >>>> sure > >> >>>> of > >> >>>> the details, but there are additional build parameters you have to > >> >>>> define > >> >>>> when SGen is enabled. > >> >>>> > >> >>>> > >> >>>> > >> >>>> -- > >> >>>> View this message in context: > >> >>>> > >> >>>> > http://monotouch.2284126.n4.nabble.com/GC-ed-System-MissingMethodException-tp4656569p4656575.html > >> >>>> Sent from the MonoTouch mailing list archive at Nabble.com. > >> >>>> _______________________________________________ > >> >>>> MonoTouch mailing list > >> >>>> MonoTouch@lists.ximian.com > >> >>>> http://lists.ximian.com/mailman/listinfo/monotouch > >> >>> > >> >>> > >> >>> > >> >>> _______________________________________________ > >> >>> MonoTouch mailing list > >> >>> MonoTouch@lists.ximian.com > >> >>> http://lists.ximian.com/mailman/listinfo/monotouch > >> >>> > >> >> > >> > > >> > > >> > _______________________________________________ > >> > MonoTouch mailing list > >> > MonoTouch@lists.ximian.com > >> > http://lists.ximian.com/mailman/listinfo/monotouch > >> > > >> > >> > >> > >> -- > >> Nic Wise > >> t. +44 7788 592 806 | @fastchicken | > http://www.linkedin.com/in/nicwise > >> b. http://www.fastchicken.co.nz/ > >> > >> mobileAgent (for FreeAgent): get your accounts in your pocket. > >> http://goo.gl/IuBU > >> Trip Wallet: Keep track of your budget on the go: http://goo.gl/ePhKa > >> Earnest: Self-employed? Track your business expenses and income. > >> http://earnestapp.com > >> Nearest Bus: find when the next bus is coming to your stop. > >> http://goo.gl/Vcz1p > >> London Bike App: Find the nearest Boris Bike, and get riding! > >> http://goo.gl/Icp2 > > > > > > > > -- > Nic Wise > t. +44 7788 592 806 | @fastchicken | http://www.linkedin.com/in/nicwise > b. http://www.fastchicken.co.nz/ > > mobileAgent (for FreeAgent): get your accounts in your pocket. > http://goo.gl/IuBU > Trip Wallet: Keep track of your budget on the go: http://goo.gl/ePhKa > Earnest: Self-employed? Track your business expenses and income. > http://earnestapp.com > Nearest Bus: find when the next bus is coming to your stop. > http://goo.gl/Vcz1p > London Bike App: Find the nearest Boris Bike, and get riding! > http://goo.gl/Icp2 > _______________________________________________ > MonoTouch mailing list > MonoTouch@lists.ximian.com > http://lists.ximian.com/mailman/listinfo/monotouch >
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