Why does System.Dia​gnostics.P​rocess not work? Matlab and .Net-Framework Problem

Hello Community,

i am trying to use some Functions that use System.Diagnostics.Process (e.g. sim3d.Engine.engine, Vehicle Dynamics Blockset). This used to work on my Notebook and Desktop. However since i updated one PC to the newest Windows Version 1903, functions with System.Diagnostics.Process dont work on this machine anymore. I assume it has something to do with the .Net Framework. I tried a clean re-install of windows 10, but the problem persists. I compered both .Net Installations (regedit) and they seem to be identical.

This is the actual function i want to use:

>> sim3d.Engine.engine
Error using sim3d.Engine/setup                                                          %this should be red (error)
Invalid default value for property 'engine' in class 'sim3d.Engine':                    %this should be red
No method 'Start' with matching signature found for class 'System.Diagnostics.Process'. %this should be red

Error in sim3d.Engine                                                                   %this should be red

And this is the general approach to run System.Diagnostics.Process

A = NET.isNETSupported

notepad = System.Diagnostics.Process();
notepad.StartInfo.FileName = "notepad.exe";
notepad.StartInfo.UseShellExecute = false;
notepad.StartInfo.CreateNoWindow = true;
notepad.Start;

The result:

A =
   1
No method 'Start' with matching signature found for class 'System.Diagnostics.Process'.   %this should be red (error)
The actual function i want to use:                                                        %this should be red

So what exact Version of the .Net-Framework is required for Matlab? Maybe the Problem is the relativly new Framework 4.8? Or could it be that the path /variable to the .Net directory is messed up? Im out of ideas.

Thanks, Mathias

Answer 1

[Mathias Voigt]

The Bug has been fixed.

Solution is on Bug Report 2075910 (Link):

https://de.mathworks.com/support/bugreports/2075910

[Michael]

Hi,

I have the same problem.

I checked out the linked bug report page, but could not find a solution there.

I suspect the page was modified in the mean time, so could you provide the solution here?

Thank you

Michael

[Mathias Voigt]

Hi Michael,

you are right the Solution has been removed from the Bug Reports Page. The fix will be included in the next Matlab Update, that seems to be released soon.

Look at the post from on of the developers (8 Oct 2019):

https://de.mathworks.com/matlabcentral/fileexchange/65966-vehicle-dynamics-blockset-interface-for-unreal-engine-4-projects

If you cant wait for the update, maybe contact the developer directly. Im sure they can provide the bugfix for you.

https://de.mathworks.com/products/vehicle-dynamics/expert-contact.html

For your info: The bugfix replaced the "Engine.p" file that is called with sim3d.Engine

I hope i could help you.

[Martijn]

Note that the original question discussed two issues, clearly related, but which were eventually addressed in two separate bug reports:

1. In certain places like Simulink 3D Animation, System.Dia​gnostics.P​rocess.Start was used internally, this is discussed in:

https://www.mathworks.com/support/bugreports/2075910

2. If you yourself are directly working with System.Dia​gnostics.P​rocess.Start, see:

https://www.mathworks.com/support/bugreports/1978585

Which also discusses a workaround: Use Start(p) instead of p.Start()