FileSystemWatcher

[pjd]

Hi I'm using mono for a project which I want to run on more than just windows. The project involves a filesystemwatcher object to monitor several files used by the program and to trigger an update to the contents of the variables holding the contents of the files in memory.
This works fine on MS .NET but on mono (using windows and Arch linux as test systems, both with mono 1.2.5 and both fully updated) the program will not run and if --debug is specified it is revealed that it claims that the filesystemwatcher is not implemented. The mono FAQ says that any up-to-date kernel should work with it and google does not show much information on the issue.

Does anyone know how to get it working or is there a good alternative?

[pjd]

With mono 1.2.6 the program starts but crashes as soon as the filesystem watcher detects any changes in the directory it monitors. I can't give the error message because windows can't copy from a command prompt but there are a lot of references to C:\cygwin\tmp\... I don't know why this is as you are not supposed to need cygwin to run mono.

pjd wrote:

Hi I'm using mono for a project which I want to run on more than just windows. The project involves a filesystemwatcher object to monitor several files used by the program and to trigger an update to the contents of the variables holding the contents of the files in memory.
This works fine on MS .NET but on mono (using windows and Arch linux as test systems, both with mono 1.2.5 and both fully updated) the program will not run and if --debug is specified it is revealed that it claims that the filesystemwatcher is not implemented.The mono FAQ says that any up-to-date kernel should work with it and google does not show much information on the issue.

Does anyone know how to get it working or is there a good alternative?

[xanadont]

You can copy by clicking the icon in the upper-left > edit > mark.  
Highlight what you want copied and hit <enter>.  Paste the results  
here.

-Abe

On Jan 14, 2008, at 1:04 PM, pjd wrote:

>
> With mono 1.2.6 the program starts but crashes as soon as the  
> filesystem
> watcher detects any changes in the directory it monitors. I can't  
> give the
> error message because windows can't copy from a command prompt but  
> there are
> a lot of references to C:\cygwin\tmp\... I don't know why this is as  
> you are
> not supposed to need cygwin to run mono.
>
>
> pjd wrote:
>>
>> Hi I'm using mono for a project which I want to run on more than just
>> windows. The project involves a filesystemwatcher object to monitor
>> several files used by the program and to trigger an update to the  
>> contents
>> of the variables holding the contents of the files in memory.
>> This works fine on MS .NET but on mono (using windows and Arch  
>> linux as
>> test systems, both with mono 1.2.5 and both fully updated) the  
>> program
>> will not run and if --debug is specified it is revealed that it  
>> claims
>> that the filesystemwatcher is not implemented.The mono FAQ says  
>> that any
>> up-to-date kernel should work with it and google does not show much
>> information on the issue.
>>
>> Does anyone know how to get it working or is there a good  
>> alternative?
> --
> View this message in context: http://www.nabble.com/FileSystemWatcher-tp14160191p14577349.html
> Sent from the Mono - General mailing list archive at Nabble.com.
>
> _______________________________________________
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[Robert Jordan]

pjd wrote:
> With mono 1.2.6 the program starts but crashes as soon as the filesystem
> watcher detects any changes in the directory it monitors. I can't give the
> error message because windows can't copy from a command prompt but there are
> a lot of references to C:\cygwin\tmp\... I don't know why this is as you are
> not supposed to need cygwin to run mono.

The references are actually part of the backtrace containing
the original source code file names used to build the Mono version
distributed with the installer. The build is performed in c:\cygwin\tmp
on the build machine.

Of course you can copy from the command prompt: click on the system
menu of the console window, then on "Edit", then on "Mark".

Robert

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[pjd]

pjd wrote:

With mono 1.2.6 the program starts but crashes as soon as the filesystem watcher detects any changes in the directory it monitors. I can't give the error message because windows can't copy from a command prompt but there are a lot of references to C:\cygwin\tmp\... I don't know why this is as you are not supposed to need cygwin to run mono.

The error message is:

Unhandled Exception: System.MissingMemberException: Cannot find the requested cl
ass member.
at Microsoft.VisualBasic.CompilerServices.LateBinder.BindToMethod (System.Reflec
tion.BindingFlags,System.Reflection.MethodBase[],object[]&,System.Reflection.Par
ameterModifier[],System.Globalization.CultureInfo,string[],object&) <0x00426>
at System.MonoType.InvokeMember (string,System.Reflection.BindingFlags,System.Re
flection.Binder,object,object[],System.Reflection.ParameterModifier[],System.Glo
balization.CultureInfo,string[]) [0x00203] in C:\cygwin\tmp\monobuild\build\BUIL
D\mono-1.2.6\mcs\class\corlib\System\MonoType.cs:371
at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet (object,System.Typ
e,string,object[],string[],bool[]) <0x00095>
at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet (object,System.
Type,string,object[],string[],System.Type[],bool[]) <0x0001c>
at Room_booking.frmMain.delBooking (int) <0x00074>
at (wrapper remoting-invoke-with-check) Room_booking.frmMain.delBooking (int) <0
x00045>
at Room_booking.frmBooking.delbooking () <0x0018d>
at (wrapper remoting-invoke-with-check) Room_booking.frmBooking.delbooking () <0
x00038>
at Room_booking.frmBooking.cmdDelete_Click (object,System.EventArgs) <0x0000d>
at System.Windows.Forms.Control.OnClick (System.EventArgs) [0x0001c] in C:\cygwi
n\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Forms\System.Wi
ndows.Forms\Control.cs:5657
at System.Windows.Forms.Button.OnClick (System.EventArgs) [0x00024] in C:\cygwin
\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Forms\System.Win
dows.Forms\Button.cs:104
at System.Windows.Forms.ButtonBase.OnMouseUp (System.Windows.Forms.MouseEventArg
s) [0x00076] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed
.Windows.Forms\System.Windows.Forms\ButtonBase.cs:616
at System.Windows.Forms.Button.OnMouseUp (System.Windows.Forms.MouseEventArgs) [
0x00000] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Win
dows.Forms\System.Windows.Forms\Button.cs:126
at System.Windows.Forms.Control.WmLButtonUp (System.Windows.Forms.Message&) [0x0
005c] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Window
s.Forms\System.Windows.Forms\Control.cs:5253
at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message&) [0x0017c
] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Fo
rms\System.Windows.Forms\Control.cs:5006
at System.Windows.Forms.ButtonBase.WndProc (System.Windows.Forms.Message&) [0x00
055] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows
.Forms\System.Windows.Forms\ButtonBase.cs:674
at System.Windows.Forms.Button.WndProc (System.Windows.Forms.Message&) [0x00000]
 in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Button.cs:148
at ControlWindowTarget.OnMessage (System.Windows.Forms.Message&) [0x00000] in C:
\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Forms\Sys
tem.Windows.Forms\Control.cs:225
at ControlNativeWindow.WndProc (System.Windows.Forms.Message&) [0x00000] in C:\c
ygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Forms\Syste
m.Windows.Forms\Control.cs:206
at System.Windows.Forms.NativeWindow.WndProc (intptr,System.Windows.Forms.Msg,in
tptr,intptr) [0x0006a] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\cla
ss\Managed.Windows.Forms\System.Windows.Forms\NativeWindow.cs:188
at System.Windows.Forms.XplatUIWin32.InternalWndProc (intptr,System.Windows.Form
s.Msg,intptr,intptr) [0x0002c] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6
\mcs\class\Managed.Windows.Forms\System.Windows.Forms\XplatUIWin32.cs:1886
at (wrapper native-to-managed) System.Windows.Forms.XplatUIWin32.InternalWndProc
 (intptr,System.Windows.Forms.Msg,intptr,intptr) <0x00065>
at (wrapper managed-to-native) System.Windows.Forms.XplatUIWin32.Win32DispatchMe
ssage (System.Windows.Forms.MSG&) <0x00004>
at System.Windows.Forms.XplatUIWin32.DispatchMessage (System.Windows.Forms.MSG&)
 [0x00000] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.W
indows.Forms\System.Windows.Forms\XplatUIWin32.cs:2081
at System.Windows.Forms.XplatUI.DispatchMessage (System.Windows.Forms.MSG&) [0x0
0000] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Window
s.Forms\System.Windows.Forms\XplatUI.cs:551
at System.Windows.Forms.Application.RunLoop (bool,System.Windows.Forms.Applicati
onContext) [0x00359] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class
\Managed.Windows.Forms\System.Windows.Forms\Application.cs:844
at System.Windows.Forms.Application.Run (System.Windows.Forms.ApplicationContext
) [0x00014] in C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.
Windows.Forms\System.Windows.Forms\Application.cs:630
at System.Windows.Forms.Application.Run (System.Windows.Forms.Form) [0x00000] in
 C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.Forms\
System.Windows.Forms\Application.cs:618
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun (
) <0x00040>
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run (st
ring[]) <0x0000b>
at Room_booking.My.MyApplication.Main (string[]) <0x0003e>

[Rolf Bjarne Kvinge-2]

Hi,

>
>
>
> pjd wrote:
> >
> > With mono 1.2.6 the program starts but crashes as soon as the filesystem
> > watcher detects any changes in the directory it monitors. I can't give
the
> > error message because windows can't copy from a command prompt but there
> > are a lot of references to C:\cygwin\tmp\... I don't know why this is as
> > you are not supposed to need cygwin to run mono.
> >
>
> The error message is:
>
> Unhandled Exception: System.MissingMemberException: Cannot find the
requested class member.
> at Microsoft.VisualBasic.CompilerServices.LateBinder.BindToMethod
>
(System.Reflection.BindingFlags,System.Reflection.MethodBase[],object[]&,Sys
tem.Refle
>
ction.ParameterModifier[],System.Globalization.CultureInfo,string[],object&)
> <0x00426>
> at System.MonoType.InvokeMember
(string,System.Reflection.BindingFlags,System.Reflection.Binder,object,objec
t[],System.Reflection.ParameterModifier[],System.Globalization.CultureInfo,s
tring[]) [0x00203] in
>
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\corlib\System\MonoT
ype.cs:371
> at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet
(object,System.Type,string,object[],string[],bool[]) <0x00095>
> at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet
(object,System.Type,string,object[],string[],System.Type[],bool[]) <0x0001c>
> at Room_booking.frmMain.delBooking (int) <0x00074>

This is probably a problem out late binding in visual basic, but I'd need to
know what this method is trying to do (what method/property is it trying to
access, etc), could you paste the code in this method?

Rolf

> at (wrapper remoting-invoke-with-check) Room_booking.frmMain.delBooking
(int) <0x00045>
> at Room_booking.frmBooking.delbooking () <0x0018d>
> at (wrapper remoting-invoke-with-check) Room_booking.frmBooking.delbooking
() <0x00038>
> at Room_booking.frmBooking.cmdDelete_Click (object,System.EventArgs)
<0x0000d>
> at System.Windows.Forms.Control.OnClick (System.EventArgs) [0x0001c] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Control.cs:5657
> at System.Windows.Forms.Button.OnClick (System.EventArgs) [0x00024] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Button.cs:104
> at System.Windows.Forms.ButtonBase.OnMouseUp
(System.Windows.Forms.MouseEventArgs) [0x00076] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\ButtonBase.cs:616
> at System.Windows.Forms.Button.OnMouseUp
(System.Windows.Forms.MouseEventArgs) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Button.cs:126
> at System.Windows.Forms.Control.WmLButtonUp
(System.Windows.Forms.Message&) [0x0005c] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Control.cs:5253
> at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message&)
[0x0017c]
inC:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.F
orms\System.Windows.Forms\Control.cs:5006
> at System.Windows.Forms.ButtonBase.WndProc (System.Windows.Forms.Message&)
[0x00055] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\ButtonBase.cs:674
> at System.Windows.Forms.Button.WndProc (System.Windows.Forms.Message&)
[0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Button.cs:148
> at ControlWindowTarget.OnMessage (System.Windows.Forms.Message&) [0x00000]
in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Control.cs:225
> at ControlNativeWindow.WndProc (System.Windows.Forms.Message&) [0x00000]
in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Control.cs:206
> at System.Windows.Forms.NativeWindow.WndProc
(intptr,System.Windows.Forms.Msg,intptr,intptr) [0x0006a] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\clas\Managed.Windows.Form
s\System.Windows.Forms\NativeWindow.cs:188
> at System.Windows.Forms.XplatUIWin32.InternalWndProc
(intptr,System.Windows.Forms.Msg,intptr,intptr) [0x0002c] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\XplatUIWin32.cs:1886
> at (wrapper native-to-managed)
System.Windows.Forms.XplatUIWin32.InternalWndProc
(intptr,System.Windows.Forms.Msg,intptr,intptr) <0x00065>
> at (wrapper managed-to-native)
System.Windows.Forms.XplatUIWin32.Win32DispatchMessage
(System.Windows.Forms.MSG&) <0x00004>
> at System.Windows.Forms.XplatUIWin32.DispatchMessage
(System.Windows.Forms.MSG&) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\XplatUIWin32.cs:2081
> at System.Windows.Forms.XplatUI.DispatchMessage
(System.Windows.Forms.MSG&) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\XplatUI.cs:551
> at System.Windows.Forms.Application.RunLoop
(bool,System.Windows.Forms.ApplicationContext) [0x00359] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Application.cs:844
> at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext) [0x00014] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Application.cs:630
> at System.Windows.Forms.Application.Run (System.Windows.Forms.Form)
[0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-1.2.6\mcs\class\Managed.Windows.For
ms\System.Windows.Forms\Application.cs:618
> at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun
() <0x00040> at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run
(string[]) <0x0000b>

> at Room_booking.My.MyApplication.Main (string[]) <0x0003e>
>
> --
> View this message in context: http://www.nabble.com/FileSystemWatcher-
> tp14160191p14808088.html
> Sent from the Mono - General mailing list archive at Nabble.com.
>
> _______________________________________________
> Mono-list maillist  -  Mono-list@...
> http://lists.ximian.com/mailman/listinfo/mono-list
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.2/1223 - Release Date:
> 13/01/2008 20:23

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[pjd]

Rolf Bjarne Kvinge-2 wrote:

Hi,

This is probably a problem out late binding in visual basic, but I'd need to
know what this method is trying to do (what method/property is it trying to
access, etc), could you paste the code in this method?

Rolf

it is a filesystemwatcher_changed event

[Rolf Bjarne Kvinge-2]

> -----Original Message-----
> From: mono-list-bounces@... [mailto:mono-list-
> bounces@...] On Behalf Of pjd
> Sent: lunes, 14 de enero de 2008 19:54
> To: mono-list@...
> Subject: Re: [Mono-list] FileSystemWatcher
>
>
>
>
> Rolf Bjarne Kvinge-2 wrote:
> >
> > Hi,
> >
> > This is probably a problem out late binding in visual basic, but I'd

need to know what this method is trying to do (what method/property is it
trying
> > to access, etc), could you paste the code in this method?
> >
> > Rolf
> >
> >
>
> it is a filesystemwatcher_changed event
>

Can you create some code to that reproduces this so that I can try it out?
Otherwise it will be hard to get any further.

Rolf

> --
> View this message in context: http://www.nabble.com/FileSystemWatcher-
> tp14160191p14809207.html
> Sent from the Mono - General mailing list archive at Nabble.com.
>
> _______________________________________________
> Mono-list maillist  -  Mono-list@...
> http://lists.ximian.com/mailman/listinfo/mono-list
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.2/1223 - Release Date:
> 13/01/2008 20:23

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[pjd]

Rolf Bjarne Kvinge-2 wrote:

Can you create some code to that reproduces this so that I can try it out?
Otherwise it will be hard to get any further.

Rolf

I have just discovered that the bug is not where I thought it is, but I still do not know what the problem is

this file should work under .NET but not mono. As a rule I always compile under .NET
Form1.vb

the crash will occur on line 33

What can I do to fix this?

[Rolf Bjarne Kvinge-2]

>
>
> I have just discovered that the bug is not where I thought it is
>
> this file should work under .NET but not mono. As a rule I always
> compile
> under .NET
> http://www.nabble.com/file/p14815890/Form1.vb Form1.vb
>
> the crash will occur on line 33

Thanks for the repro, I've been able to reproduce it and will inform you
when I've fixed it.

Rolf

> --
> View this message in context: http://www.nabble.com/FileSystemWatcher-
> tp14160191p14815890.html
> Sent from the Mono - General mailing list archive at Nabble.com.
>
> _______________________________________________
> Mono-list maillist  -  Mono-list@...
> http://lists.ximian.com/mailman/listinfo/mono-list
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.2/1223 - Release Date:
> 13/01/2008 20:23

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[Andy Hume]

> > I have just discovered that the bug is not where I thought it is
> >
> > this file should work under .NET but not mono. As a rule I always
> > compile under .NET http://www.nabble.com/file/p14815890/Form1.vb 
> > Form1.vb
> >
> > the crash will occur on line 33
>
> Thanks for the repro, I've been able to reproduce it and will
> inform you when I've fixed it.
>

And there are various workarounds until then. :-)  The simplest is do an
explicit cast whenever you access an element of the collection, i.e.
change line 33 to:
        If CType(collection(index), thing).num = num Then '...
That works fine, the compiler can then early-bind to the 'num' field.
(If you set Option Strict On, then the compiler would disallow the
former form, and any other uses of late binding...)  Apologies if I'm
teaching my granny to such eggs...

Another option is to change to using a Generic collections (i.e.
System.Collections.Generic.List(Of thing)), it is type-safe and thus the
cast is unnecessary.  However the VB Collections class uses 1-based
indices whereas the collections classes from the Framework Class Library
are all 0-indexed, so you'd need to make changes respectively...

Andy

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