[ubuntu-mono] [Bug 990960] Re: openBVE crashes, another dependency issue?

[ludo33200]

I think there a t least 3 problems reported here

Concerning the following problem
>System.NullReferenceException: Object reference not set to an instance of an object
>  at System.Windows.Forms.ListView+ItemControl.ItemsMouseDown (System.Object sender, >System.Windows.Forms.MouseEventArgs me) [0x00000] in <filename unknown>:0

Other mentionned bugs should have been reported elsewhere for other bugs
(duplicates ?)

Ubuntu 15.04
+ OpenBVE 1.4.0.9-1 as installed
I reproduce this bug each time i try to select a route with the mouse (not with the keyboard)

After having tried to localize the problem with monoDevelop, i think
i've found something that could cause the problem

When i read the source code, i see
OpenBve/OldCode/formMain.Start.cs, 

private void ShowRoute(bool UserSelectedEncoding) {
			if (Result.RouteFile != null) {
				this.Cursor = Cursors.WaitCursor;
				Application.DoEvents(); 
				]...[


C# Microsoft documentation suggests this code (Application.DoEvent call ) could cause problems
https://msdn.microsoft.com/en-US/library/system.windows.forms.application.doevents%28v=vs.110%29.aspx
You will find many posts on many forums about this topic

>Calling this method causes the current thread to be suspended while all
waiting window messages are processed. If a message >causes an event to
be triggered, then other areas of your application code may execute.
This can cause your application to >exhibit unexpected behaviors that
are difficult to debug.

What i see is that removing this instruction (Application.DoEvent call) seems  to remove the problem and allowing to show the route.
As i'm not a premium developper i'm not directly going to change the code for OpenBve.
If anyone could validate or not the code ??

---------- Code suggested
private void ShowRoute(bool UserSelectedEncoding) {
			if (Result.RouteFile != null) {
				this.Cursor = Cursors.WaitCursor;
				if (!Program.CurrentlyRunningOnMono) { // disabled code on Mono because it makes crash
					Application.DoEvents(); 
				}
                                ]...[

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https://bugs.launchpad.net/bugs/990960

Title:
  openBVE crashes, another dependency issue?

Status in openbve package in Ubuntu:
  Confirmed

Bug description:
  Hi, when trying to load the Northern Line on openBVE it crashes with:

  Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
    at OpenBve.Timetable.CollectData (OpenBve.Table& Table) [0x00000] in <filename unknown>:0 
    at OpenBve.Timetable.CreateTimetable () [0x00000] in <filename unknown>:0 
    at OpenBve.MainLoop.StartLoopEx (MainDialogResult result) [0x00000] in <filename unknown>:0 
    at OpenBve.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 
  [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
    at OpenBve.Timetable.CollectData (OpenBve.Table& Table) [0x00000] in <filename unknown>:0 
    at OpenBve.Timetable.CreateTimetable () [0x00000] in <filename unknown>:0 
    at OpenBve.MainLoop.StartLoopEx (MainDialogResult result) [0x00000] in <filename unknown>:0 
    at OpenBve.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 

  Could this be another dependency issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: openbve 1.4.0.9-1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Sun Apr 29 09:21:04 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: openbve
  UpgradeStatus: No upgrade log present (probably fresh install)

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