Bug 8786 - MissingMethodException when using MemoryMappedFile.CreateFromFile in simulator
Summary: MissingMethodException when using MemoryMappedFile.CreateFromFile in simulator
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: 6.1.x
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-12-05 18:17 UTC by Frank A. Krueger
Modified: 2012-12-06 12:30 UTC (History)
3 users (show)

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

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.

Please create a new report on Developer Community or GitHub with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:

Description Frank A. Krueger 2012-12-05 18:17:38 UTC
When I try to use MemoryMappedFile.CreateFromFile, I get the following exception when running in the simulator:

[ERROR] FATAL UNHANDLED EXCEPTION: System.MissingMethodException: Cannot find the requested method.
  at (wrapper managed-to-native) System.IO.MemoryMappedFiles.MemoryMapImpl:mono_filesize_from_path (string)
  at System.IO.MemoryMappedFiles.MemoryMapImpl.Open (System.String path, FileMode mode, Int64 capacity, MemoryMappedFileAccess access) [0x00000] in /Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.IO.MemoryMappedFiles/MemoryMappedFile.cs:358 
  at System.IO.MemoryMappedFiles.MemoryMappedFile.CreateFromFile (System.String path, FileMode mode, System.String mapName, Int64 capacity, MemoryMappedFileAccess access) [0x00055] in /Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.IO.MemoryMappedFiles/MemoryMappedFile.cs:475 

The repo is simply:

using (var mm = MemoryMappedFile.CreateFromFile ("file", FileMode.Open, null, 0L, MemoryMappedFileAccess.Read)) {

  Mono JIT compiler version 2.10.11 (mono-2-10/6cee717 Thu Nov 29 17:32:29 EST 2012)
Comment 1 Sebastien Pouliot 2012-12-06 08:49:51 UTC
Rodrigo added MemoryMappedFile support last year (managed code) but some functions (inclduing the one above) are not part of mono (at least not the one used when JITing / simulator).

#if (defined (__MACH__) && defined (TARGET_ARM)) || defined (TARGET_ANDROID)
Comment 2 Rodrigo Kumpera 2012-12-06 12:30:07 UTC
Fixed on MM and bumped monotouch head. Please bump 6.0-series if this bug needs to be fixed there as well.