Listener crash in standalone application

I’m trying to check for file modifications in specific folder by using .Net Events listener in my GUI. But I have some troubles while using standalone version of the code. The idea is to add a listener at GUI startup :

function testGUI_OpeningFcn(hObject, eventdata, handles, varargin)

        %Listener
        folder = 'D:\Temp';
        % .Net
        handles.fileObj = System.IO.FileSystemWatcher(folder);
        handles.fileObj.Filter = 'log.datc';
        handles.fileObj.EnableRaisingEvents = true;

        % Filtres
        filter = bitor(System.IO.NotifyFilters.FileName,   System.IO.NotifyFilters.DirectoryName);
        filter = bitor(filter, System.IO.NotifyFilters.Attributes);
        filter = bitor(filter, System.IO.NotifyFilters.Size);
        filter = bitor(filter, System.IO.NotifyFilters.LastWrite);
        filter = bitor(filter, System.IO.NotifyFilters.LastAccess);
        filter = bitor(filter, System.IO.NotifyFilters.CreationTime);
        filter = bitor(filter, System.IO.NotifyFilters.Security);
        handles.fileObj.NotifyFilter = filter;

        addlistener(handles.fileObj, 'Created', @eventhandlerChanged); 

handles.output = hObject;

Then we need eventhandlerChanged function:

function eventhandlerChanged(obj,eData)
  msgbox('Test')
end

So, when the file is modified we can see a massage ‘Test’.

This implementation works perfectly within Matlab interface. Contrariwise, the standalone application (generated by Matlab Builder) crashes every time when modification event is detected. Any ideas why it happens?

Thanks in advance for any help.

Answer 1

[YM]

Some precisions about the crash. The crash report says :

 ------------------------------------------------------------------------
          Access violation detected at Mon Jun 22 10:59:09 2015
 ------------------------------------------------------------------------

 Configuration:
  Crash Decoding      : Disabled
  Crash Mode          : continue (default)
  Current Graphics Driver: NVIDIA Corporation GeForce GT 640/PCIe/SSE2 Version 4.4.0 NVIDIA 344.11
  Default Encoding    : windows-1252
  Graphics card 1     : NVIDIA ( 0x10de ) NVIDIA GeForce GT 640  Version 9.18.13.4411
  Host Name           : SIMU
  MATLAB Architecture : win64
  MATLAB Root         : C:\Program Files\MATLAB\MATLAB Production Server\R2015a
  MATLAB Version      : 8.5.0.197613 (R2015a)
  OpenGL              : hardware
  Operating System    : Microsoft Windows 7 Professionnel 
  Processor ID        : x86 Family 6 Model 45 Stepping 7, GenuineIntel
  Virtual Machine     : Java 1.7.0_60-b19 with Oracle Corporation Java  HotSpot(TM) 64-Bit Server VM mixed mode
  Window System       : Version 6.1 (Build 7601: Service Pack 1)

 Fault Count: 1

 Abnormal termination:
 Access violation

 Register State (from fault):
  RAX = 0000000000000000  RBX = 00000000dee65860
  RCX = 0000000000000000  RDX = 00000000e5446d80
  RSP = 0000000016262c20  RBP = 00000000103e3e08
  RSI = 0000000000000000  RDI = 00000000e5446d80

   R8 = 0000000010b77248   R9 = 0000000010a39010
  R10 = 000000000ec857c0  R11 = 00000000107329b0
  R12 = 0000000000000000  R13 = 000000007463f468
  R14 = 00000000103e6e90  R15 = 0000000009492bd0

RIP = 00000000fd0d81de  EFL = 00010202

   CS = 0033   FS = 0053   GS = 002b

[Phillip]

Have you managed to solve this? It's a known bug in compiled .NET callback routines. Very frustrating.