.NET (Core and Framework)

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

6-Nov-19 4:58

steve_9496613 wrote:
in my application taht runs in Windows Embedded Compact 7 OS

Works as expected when I run it on the desktop. Step through it with the debugger, and verify the path to the XML.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

steve_94966136-Nov-19 21:48

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

6-Nov-19 21:48

Thanks Eddy.

The path is right.
When I go step by step with the debugger everything just stop at the line that read the XML.

Today I finnaly get an error message in the device:

System.StackOverflowException: StackOverflowException
  at System.Xml.Schema.SequenceNode.ConstructPos(BitSet firstpos, BitSet lastpos, Bitset[] followpos)
  at System.Xml.Schema.SequenceNode.ConstructPos(BitSet firstpos, BitSet lastpos, Bitset[] followpos)
  at System.Xml.Schema.SequenceNode.ConstructPos(BitSet firstpos, BitSet lastpos, Bitset[] followpos)
  ...

Now I know the reason (I think...) but not the solution...

Any idea?

Thanks

Richard MacCutchan7-Nov-19 0:34

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 0:34

A StackOverflowException means that your process has run out of local memory. You can try increasing the stack size or request heap space to hold whatever data is causing the overflow.

steve_94966137-Nov-19 1:39

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 1:39

Thanks Richard.

How can I increase the stack size? I use Visual Studio 2008 and this is a smart device VB.net project.
I don't find any specific setting in the project properties

Richard MacCutchan7-Nov-19 1:53

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 1:53

I am not a VB expert so not sure what you would need to do. I guess Google is the place to look. But in reality, this exception is a warning that your application needs reworking in some way.

steve_94966137-Nov-19 3:41

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 3:41

Hi Richard,

surely a StackOverflowException means something bad, for this reason I tried to reproduce the problem with few clean lines of code.
I managed to replicate the problem just with a Form, a Button and the code I posted.
This does not mean that the complete application would not benefit from a reworking (...) but it seems to me that in this situation the problem is in a single line of code.
Probably, as Eddy suggests, I should use another way to store and read the application settings.

Richard MacCutchan7-Nov-19 3:57

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 3:57

steve_9496613 wrote:
surely a StackOverflowException means something bad

Yes, as I already explained it means you have used up all your local memory (stack space). If that is because you are reading huge amounts of data then that is the area that needs investigation. If that is not the reason (which is also possible) then more debugging may be required. In either case the only way to be sure is to use the debugger to see what is happening inside the application under real load.

steve_94966137-Nov-19 21:42

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 21:42

Thank you Richard.
I'll try to dig deeper to find the reason because this is a loose cannon in my code.

Richard MacCutchan7-Nov-19 22:05

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 22:05

It may just be that in an embedded/compact framework you do not have enough physical memory to provide the space that you would expect in a larger system.

Eddy Vluggen7-Nov-19 1:26

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 1:26

To build on Richards' answer, might help to make the files smaller; cut them in chuncks before reading them. I assume you'll be importing them into a database?

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

steve_94966137-Nov-19 2:04

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 2:04

Hi Eddy.

These files are created by the application and contain user programming.
They can be larger or smaller depending on what the user does.
When the user changes something, the file is updated.
While the application is running, there is no problem.
When the application is closed and restarted, settings are loaded from the file and here is the crash.
I load the XML file in a DataSet because I can read all with a line of code with ReadXml and then I copy the DataSet content in the different internal variables and structures; I don't use a real database.

To limit the file size and use more than one if one file is not enough could be a solution.

If ReadXml works fine in a desktop environment with full .NET, perhaps there is a bug in the .NET Compact Framework version of this function?

Eddy Vluggen7-Nov-19 2:15

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 2:15

steve_9496613 wrote:
I load the XML file in a DataSet because I can read all with a line of code with ReadXml and then I copy the DataSet content in the different internal variables and structures; I don't use a real database.

You are using an export-format as a datastore; use a real database and the problem is gone.

steve_9496613 wrote:
If ReadXml works fine in a desktop environment with full .NET, perhaps there is a bug in the .NET Compact Framework version of this function?

Sure, maybe. Maybe there's some difference between the frameworks, simply because a device isn't as powerfull as a real desktop, with more limitations.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

steve_94966137-Nov-19 3:33

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 3:33

Eddy Vluggen wrote:
You are using an export-format as a datastore; use a real database and the problem is gone.

You're right, I didn't use a real database because of my lack of knowledge about databases.

Eddy Vluggen7-Nov-19 5:49

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 5:49

steve_9496613 wrote:
You're right, I didn't use a real database because of my lack of knowledge about databases.

Take your time and give it a try; it will not only benefit you in this project, but all the projects to come. If stuck, simply post the code here Smile | :)

I'd recommend SQLite, since you don't require a dedicated server or multi-user access. It's free, small and there's the benefit that you can copy the db to your desktop and edit its contents there.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

steve_94966137-Nov-19 21:22

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 21:22

Thanks for your advice Eddy, I'll give it a try.
I have already tried SQLite in C++ (Embarcadero C++Builder) but I was not really satisfied from what I managed to do...
I see that here there are some articles as "Using SQLite in C#/VB.Net" that seems to be a good point to start.

Eddy Vluggen7-Nov-19 21:30

Re: (VS2008 - VB.Net - Compact Framework) DataSet.ReadXml metod fails

7-Nov-19 21:30

You're welcome Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Member 146492478-Nov-19 4:41

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8-Nov-19 4:41

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ERROR IN .NET FRAMEWORK - in Windows 10 - how to solve this?

S3TH_201920-Oct-19 0:22

S3TH_2019

20-Oct-19 0:22

Hi everyone,

I have an application (esims) on my laptop that works normally until the point of displaying the reports.
The app is made in .Net Framework and at its requirements the programmers said that it needs the .Net Framework 2. Now we have Installed at work the same app on windows 7 and windows 10 OS's and works, but on this laptop even if it has Windows 10 Pro, .Net Framework 3.5 (that includes .Net 2 & 3) and .Net 4.8 installed right, the app starts, but when I go and I want to display some reports it gives me the following error:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'ReportViewer'.
   at Microsoft.Reporting.WinForms.ReportViewer.get_CurrentReport()
   at Microsoft.Reporting.WinForms.ReportViewer.Clear()
   at Microsoft.Reporting.WinForms.ReportViewer.RefreshReport(Int32 targetPage, PostRenderArgs postRenderArgs)
   at Microsoft.Reporting.WinForms.ReportViewer.RefreshReport()
   at Universum_Client.ReportForms.frmPrev.YVA4YnrEuQZ(Object  , EventArgs  )
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9148 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll</h2>

eSims
    Assembly Version: 1.0.7102.22332
    Win32 Version: 1.0.7102.22332
<h2>    CodeBase: file:///C:/Program%20Files%20(x86)/UAIC/eSIMS/eSims.exe</h2>

MessageBoxGC
    Assembly Version: 1.0.6904.25481
    Win32 Version: 1.0.7102.22332
<h2>    CodeBase: file:///C:/Program%20Files%20(x86)/UAIC/eSIMS/eSims.exe</h2>

System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll</h2>

System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9147 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll</h2>

System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll</h2>

Accessibility
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll</h2>

Universum_Library
    Assembly Version: 1.0.7102.22323
    Win32 Version: 1.0.7102.22332
<h2>    CodeBase: file:///C:/Program%20Files%20(x86)/UAIC/eSIMS/eSims.exe</h2>

System.Runtime.Remoting
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Runtime.Remoting/2.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll</h2>

System.Configuration
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll</h2>

System.Xml
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll</h2>

System.Data
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll</h2>

Microsoft.ReportViewer.WinForms
    Assembly Version: 11.0.0.0
    Win32 Version: 11.0.3442.2 ((SQL11_SP1_RS_Dev12-RTM).140611-0541 )
<h2>    CodeBase: file:///C:/Program%20Files%20(x86)/UAIC/eSIMS/Microsoft.ReportViewer.WinForms.DLL</h2>

System.Core
    Assembly Version: 3.5.0.0
    Win32 Version: 3.5.30729.9135 built by: WinRelRS6
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll</h2>

Microsoft.ReportViewer.Common
    Assembly Version: 11.0.0.0
    Win32 Version: 11.0.3442.2 ((SQL11_SP1_RS_Dev12-RTM).140611-0541 )
<h2>    CodeBase: file:///C:/Program%20Files%20(x86)/UAIC/eSIMS/Microsoft.ReportViewer.Common.DLL</h2>

System.Web.Services
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.9136 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Web.Services/2.0.0.0__b03f5f7f11d50a3a/System.Web.Services.dll</h2>

dy61duv6
    Assembly Version: 11.0.0.0
    Win32 Version: 2.0.50727.9147 (WinRelRS6.050727-9100)
<h2>    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll</h2>

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Now I have made all possibile updates for windows and nothing changed.
P.S.: I'm not a programmer so, please I need a solution straightforward an easy to use or understand for me to replicate.

Let say that I'm only a network tehnician.

Thank you in advance.

Re: ERROR IN .NET FRAMEWORK - in Windows 10 - how to solve this?

Eddy Vluggen20-Oct-19 2:29

Re: ERROR IN .NET FRAMEWORK - in Windows 10 - how to solve this?

20-Oct-19 2:29

That's not an error in the .NET Framework, but the application you are running. It is trying to access an object that has already been disposed - like accessing memory that's already freed.

S3TH_2019 wrote:
Now I have made all possibile updates for windows and nothing changed.

No update can correct a fault in the application. Ask the person who wrote it to take a look at it.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

S3TH_201920-Oct-19 10:21

S3TH_2019

20-Oct-19 10:21

Hi Eddy,

Thank you for replying, if that is an error of application then how can my colleagues from work, that have similar pc's, with Win 10 Pro installed and this app (esims) work with it? Without having this trouble with this error?

Re: ERROR IN .NET FRAMEWORK - in Windows 10 - how to solve this?

Eddy Vluggen20-Oct-19 10:28