Bug 16505 - linker drops NSPrintPreviewGraphicsContext, causing a crash
Summary: linker drops NSPrintPreviewGraphicsContext, causing a crash
Status: VERIFIED FIXED
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: mmp ()
Version: 1.6.19
Hardware: PC Mac OS
: Normal normal
Target Milestone: 2.0.x
Assignee: Sebastien Pouliot
URL:
Depends on:
Blocks:
 
Reported: 2013-11-28 22:52 UTC by Ademar Gonzalez
Modified: 2015-04-29 14:33 UTC (History)
4 users (show)

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


Attachments
XS project (5.76 MB, application/zip)
2013-11-28 22:52 UTC, Ademar Gonzalez
Details


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Related Links:
Status:
VERIFIED FIXED

Description Ademar Gonzalez 2013-11-28 22:52:34 UTC
Created attachment 5563 [details]
XS project

When enabling the linker the class NSPrintPreviewGraphicsContext is not linked in.

As a result when the user access the Print dialog via File -> Print or Cmd + P the application crashes with the following exception.

Unhandled Exception:
System.ArgumentException: Could not find a valid superclass for type NSPrintPreviewGraphicsContext. Did you forget to register the bindings at MonoMac.ObjCRuntime.Class.Register() or call NSApplication.Init()?

To reproduce:

- Run the attached project (linking is enabled)
- Go to File -> Print
Comment 1 Sebastien Pouliot 2013-12-02 11:14:47 UTC
`NSPrintPreviewGraphicsContext` is a special type and we'll add the code to handle it in a future release. In the meantime you should be able to workaround this by adding:

    typeof (NSPrintPreviewGraphicsContext);

somewhere inside your code. The linker will see (and mark) the type and it will be available at runtime. That will allow you to re-enable the linker.
Comment 2 Sebastien Pouliot 2015-03-12 17:43:03 UTC
Fixed in maccore/master d047ee123f3bfc28126bb9258878fccfed8d1c7a
Backported in maccio/macios-cycle5 31b1c12e4d8890b585da9e8016b10246f3d0c6f1

The workaround (from comment #1) won't be needed in XM 2.0+
Comment 3 Rajneesh Kumar 2015-03-13 14:56:19 UTC
I have checked this issue with the following builds:

Xamarin Studio Version 5.9 (build 210)
Installation UUID: 011d70a5-dede-428b-ab04-ef451c2e539d
Runtime:
Mono 4.0.0 ((detached/1bd3b8a)
GTK+ 2.24.23 (Raleigh theme)
Package version: 400000051
Apple Developer Tools Xcode 6.2 (6776)
Xamarin.Mac Version: 2.0.0.99 (Business Edition)
=== Build Information ===
Release ID: 509000210
Git revision: f32ddb8c1f9836ba5e018ac51056008e9a1ac208
Build date: 2015-03-12 10:06:56-04
Xamarin addins: abfe34dd3ad6ef1a3b720d6cd74441c8e7aa22ff
Operating System Mac OS X 10.9.5
Darwin MacMini.local 13.4.0 Darwin Kernel Version 13.4.0
Sun Aug 17 19:50:11 PDT 2014
root:xnu-2422.115.4~1/RELEASE_X86_64 x86_64

I observed that this issue is working fine. Now, user when access the Print dialog via File -> Print or Cmd + P the application does't crash. 
Here is the screencast for the same: http://www.screencast.com/t/c6qX4iS3

This issue has been fixed, hence I am closing this issue.
Thanks.
Comment 4 Radu 2015-04-29 14:33:47 UTC
I am doing a custom scheme pagination and also custom page border drawing. It seems that getting NSGraphicsContext.CurrentContext in DrawPageBorder (of the view being printed) leads to the following unhandled error:
Unhandled Exception:

MonoMac.RuntimeException: The ObjectiveC class 'NSPrintPreviewGraphicsContext' could not be registered, it does not seem to derive from any known ObjectiveC class (including NSObject).
  at MonoMac.Registrar.DynamicRegistrar.Lookup (IntPtr class, Boolean throw_on_error) [0x00000] in <filename unknown>:0 
  at MonoMac.ObjCRuntime.Class.Lookup (IntPtr klass, Boolean throw_on_error) [0x00000] in <filename unknown>:0 
  at MonoMac.ObjCRuntime.Class.Lookup (IntPtr klass) [0x00000] in <filename unknown>:0 
  at MonoMac.ObjCRuntime.Runtime.GetNSObject[NSGraphicsContext] (IntPtr ptr) [0x00000] in <filename unknown>:0 
  at MonoMac.AppKit.NSGraphicsContext.get_CurrentContext () [0x00000] in <filename unknown>:0 
  at ProjectViewer_mac.SimpleReportRenderer.DrawPageBorder (SizeF borderSize) [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) MonoMac.ObjCRuntime.Messaging:bool_objc_msgSend (intptr,intptr)
  at MonoMac.AppKit.NSPrintOperation.RunOperation () [0x00000] in <filename unknown>:0 
  at ProjectViewer_mac.MyDocument.PrintReport (ReportsStandardEnum reportType) [0x00000] in <filename unknown>:0 
etc ...

In debug config this does not happen. Fortunately, I got away with the workaround suggested by Sebastien Pouliot. This issue should be reviewed and reopened or a new issue should be filed.