Thread.Interrupt() Doesn't Interrupt A Thread That Is In A Sleeping State?

Aug 18, 2009

Microsoft's System.io.file.exists and System.io.directory.exists can take FOREVER, especially if you're in a situation, where you've unplugged from the network and you're looking in a share.

So, to get around this, I've created a thread that times out after 3 seconds.  Returning false, if the calls above haven't yet returned. To do this, my main thread passes its instance to the new thread and immediately calls:

Thread.Sleep(TimeOutInSeconds * 1000) ' Where TimeOUtInSeconds = 3
The new thread then goes and checks for the file / folder using the System.io.file.exists / System.io.directory.exists functions.
Regardless of the result, then it uses the main thread's reference to call Thread.Interrupt().

My main thread doesn't get interrupted.  It stays there for the full 3 seconds. If I were to change that to 3 minutes ( and I have ), it'll sleep for 3 minutes.

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Capture A Program Initializing And Stop It, So It Doesn't Interrupt Code?

Jun 22, 2009

A spreadsheet formatter that I made for the department opens and closes Excel spreadsheets in the backround. If someone opens Excel while the macro is running, it stalls the entire program. I need a way to sense Excel opening, then stop it, preferably with a message box saying what just happened.

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Thread State - Thread In An Application Which Calls A Sub Routine Main()

Jul 26, 2010

I have a thread in an application which calls a sub routine Main(). The Main sub routine in turn call several sub routines/functions from with the same module,several different classes in the same application. Also some sub routines/functions call routines from a class library. Now say the routine/function in class library goes into a infinite loop and never returns. I would like my thread in the application to raise a event and display message to the users about the infinite loop. I am giving some sample code for the application.

Imports System.Threading

Module VMain
Public gbSuspend As Boolean

[CODE]...

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Service Will Not Stop While Thread Is Sleeping?

Feb 13, 2012

I have a VB .Net service, which uses System.Threading instead of a timer to basically do what a timer should do. My problem is stopping the service while the thread is in its sleep state. See the code below:

Imports System.Threading

Public Class AService
Private stopping As Boolean[code].....

If say 1 minutes after the service starts, it can not be stopped until its 15 minute interval ticks and the thread wakes. Is there any way to catch the signal that the service is attempting to stop, and interrupt the thread?

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Interrupt A Process While Its Running

Aug 4, 2010

I have written a application that searches the users computer for all files within a specified folder.Sometimes the number of files can be quite large. I would like the user to able to interrupt (end) this process.My code is handled by a button click in a VB win form.[code]I have tried various MsgBoxes that warn the user but I think a Esc Key or a Cancel button would be better.

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SAPI - How To Interrupt The Speech

Jan 17, 2012

I'm using a long string using SAPI speech and I want to be able stop the speech rather than have to listen to it babble on throughout the whole thing. So, in one function, we'll say it's the load function, it declares a speech string: [Code] I'm trying to get it to abort reading the audio but can't seem to figure out how to get it working. I've seen examples that have used SVSFlagsAsync and SVSFPurgeBefore Speak but I can't get either to be recognized and I've added (what I believe to be) the necessary resources to the library and added the imports at the top of the page. Does anyone know how to interrupt the speech?

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Button Interrupt To Stop Doing Continuous Event?

Apr 27, 2010

I have an event I want to do continuously until a button interrupt is pressed.
Here's the pseudo
Click button 1:
Check if button 2 is pressed
If not, do stuff
If so, stop doing stuff
End routine

So what I currently have is this:
Dim randominteger As Integer = 0
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles StartSampleButton.Click
[Code] .....
Unfortunately, it's never breaking outside of the first loop. How to get around it?

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Interrupt BeginConnect Method In Socket Class?

Aug 1, 2010

I am using the BeginConnect method of a socket to connect to a server which may or may not be on line I need to provide my users with a countdown timer which they can abort the attempted connection if they wish to The question is; how can I interrupt the Begin Connect method of an asyncronous connection

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Use The Interrupt Routine To Service A Serial Com Port?

Aug 25, 2009

May i know how to fire an event using the serial port interrupt method in visual basic windows form? Currently, now i am using the polling method which is using the timer event to continuously poll the port every 1sec.

But now i would like to change to the interrupt method which will fire up the same event without using the timer event.

[Code]...

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VS 2010 Error - Cross-Thread Operation Not Valid: Control TbPlaca1 Accessed From A Thread Other Than The Thread It Was Created On

Aug 13, 2010

In one application, I need use 4 simultaneous threads.When the threads finished, I need to update the text of a TextBox.So, I create 4 Textbox, and I wanna the threads change the text to FINISHED.Each thread change one distinct TB.I use this "example"

Dim Terminados As Integer = 0
Private Sub frmEnviarMensagem_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
Timer1.Start()

[code]....

The problem is, I have an error in the red lines.The error is: INVALIDOPERATIONEXCEPTION "Cross-Thread operation not valid: Control tbPlaca1 Accessed from a thread other than the thread it was created on."I don't use cross threading. Each TB only was accessed for the correspondent thread, and for the "main program".

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Cross-thread Operation Not Valid: Control 'Panel1' Accessed From A Thread Other Than The Thread It Was Created On." ?

Nov 3, 2011

This is the error message I am getting:

"Cross-thread operation not valid: Control 'Panel1' accessed from a thread other than the thread it was created on." The reason I am getting this error is because I am opening up a new form and then calling these three things:

Panel1.Show()
Label1.Show()
Label2.Show()

why I get this error message because it doesn't occur normally if I open Form2 after closing Form1, it only occurs when I open Form2 after closing Form4.

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Error - Cross-thread Operation Not Valid: Control 'txt1' Accessed From A Thread Other Than The Thread It Was Created On

Jul 21, 2009

I have done a program using vb2005 to display reading from my microcontroller bs2 board but have encountered some problems. My code are as follows.

Dim Stop_Rx As Boolean
Private Sub btnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRead.Click
SerialPort1.Open()

[code]....

I've encounter an error which is, (Cross-thread operation not valid: Control 'txt1' accessed from a thread other than the thread it was created on.)

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Error : Cross-thread Operation Not Valid: Control 'l_users' Accessed From A Thread Other Than The Thread It Was Created On

Jun 21, 2012

When my client try to connect to server I'm getting this error : Cross-thread operation not valid: Control 'l_users' accessed from a thread other than the thread it was created on.

Private Sub _socketManager_onConnectionAccept(ByVal SocketID As String) Handles _socketManager.onConnectionAccept
l_Users.Items.Add(SocketID)
End Sub

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Threading Progress Bar In .net - Thread Operation Not Valid Control 'ProgressBar1' Accessed From A Thread Other Than The Thread It Was Created On

Feb 17, 2012

Would anyone be able to help me here please. I'm fairly new to VB.net and threading so im just trying to figure out what is happening.When I debug this I am getting the error thread operation not valid: Control 'ProgressBar1' accessed from a thread other than the thread it was created on.

I'm a little lost as to why the error is occuring or how to fix it. I've had to put the progress bar in a separate thread otherwise the GUI crashes

[Code]...

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Waiting For Threads - Thread.join Suspend Execution Of Code On Calling Thread Until Spawned Thread Finishes Or Is Aborted

Sep 2, 2010

My understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...

With that in mind, I tried this:

For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)

[CODE]...

However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).

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Cross-thread Operation Not Valid: Control 'Autocad' Accessed From A Thread Other Than The Thread It Was Created On

Jun 6, 2010

I have written an application that loads a form - frmCad as well as AutoCad. It does this via a class which detects when AutoCad quits.

Friend Class CadApp   Private WithEvents AppObject As AcadApplication...   Private Sub AppObject_BeginQuit(ByRef Cancel As Boolean) Handles AppObject.BeginQuit      RaiseEvent Quit()   End SubEnd Class

My main class loads frmCad as well as CadApp.

Public Class Cad   Private WithEvents frmCad As CadForm   Private WithEvents app As CadApp...   Public Sub ShowForm()      If frmCad Is Nothing Then frmCad = New CadForm      frmCad.Visible = True   End Sub...   Private Sub app_Quit() Handles app.Quit      frmCad.Dispose()      frmCad = Nothing ....   End Sub

When I debug the program, it stops at frmCad.Dispose()The program continues to execute, but all the code after it fails to work.Looking more carefully I get an error message which contains:-Cross-thread operation not valid: Control 'Autocad' accessed from a thread other than the thread it was created on.

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Cross-thread Operation Not Valid: Control 'label2' Accessed From A Thread Other Than The Thread It Was Created On?

Feb 9, 2011

My error:Cross-thread operation not valid: Control 'label2' accessed from a thread other than the thread it was created on. I want to be able to give my Public RunBot() sub access to edit Labels, buttons, etc without an error.

[Code]...

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Cross-thread Operation Not Valid: Control 'lblStatus' Accessed From A Thread Other Than The Thread It Was Created On

Apr 1, 2010

I'm getting the 'System.InvalidOperationException' error on acccessing a thread from other than where it was created. My code is:

'Required by the Windows Form Designer
Public components As System.ComponentModel.IContainer ' changed from private

[code]....

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Cross-thread Operation Not Valid: Control 'statusHO' Accessed From A Thread Other Than The Thread It Was Created On

Jun 6, 2009

My problem is Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on.

System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
StackTrace:

[Code]...

i used it and it works fine then. but as it is mentioned its not a good practice to use it. So what should i do? is it ok if i use this as i am not able to use correct practice. Mine application is not for enterprise purpose. its just my class project, and it works fine even if i put application working in background. System works ok.  I dont know how to correct this error.As i dont have that much knowlege of threads.

So please guide me how to fix this in correct way otherwise i am force to go for bad programming practice
Please refer to Windows Mobile Developer Center > Smart Device Development Forums > Windows Mobile Development > Appendtext not working for all my code details

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Cross-thread Operation Not Valid: Control 'lv1' Accessed From A Thread Other Than The Thread It Was Created On?

Aug 4, 2009

Cross-thread operation not valid: Control 'lv1' accessed from a thread other than the thread it was created on.

Dim lvi As ListViewItem
For Each lvi In lv1.Items

[code]....

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Error Saying "Cross-thread Operation Not Valid: Control 'lblOnline' Accessed From A Thread Other Than The Thread It Was Created On."?

Feb 7, 2011

Ok i have a Form with the following

Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtNotepad.Text = LoadFile("notes.txt")

[code].....

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Thread State Exception Was Unhandled By Usercode?

Aug 27, 2010

I am using VB.net and I am getting this error only in debugging mode.Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process.

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ICollections Sort Thread State - Any Object By Its Property

Mar 18, 2009

to be able to print a list of objects in a user-defined way, i've implemented an IComparer (sortclass), which is able to sort any object by its property. I have a list that can be printed (first a pdf is generated trough the object, then passed to the printer), all done by clicking 1 button (print button).

The internal ICollection (list of) is perfectly sorted, however, the routine to create and print the objects is apparently called to soon... since not all objects are completely sorted when send to the printqueueu. A check of the list after all objects has been send to the printer proves however that the list is printed.

[Code]...

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Raise Information State Value From A Function Call In A Thread

Mar 4, 2012

I'm calling a class function in a thread function. I'm using invoke method to send a value to a progressbar in the main form and I don't know how to do that in an other class function called by the thread function.

My goal is to send a value to a progressbar to the main form from the thread function and even from the function called by the thread function.

My code:
' Invoke sub
Public Sub UpdPgEvent(ByVal value As Integer)
Me.pgFindEvent.Value = value

[Code]....

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Gui :: Interrupt Form Loop And End Form?

Jun 27, 2012

I have a form that goes through an endless loop and processes data. When I click a button that "closes" the form the form keeps processing even though it is closed. I want the form to completely end and exit out of its loop statement. Then open a new form.Here is the code I am using to close the form

frmMain.Close()
frmMain.Dispose()

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Thread Priority Doesn't Work

Nov 3, 2009

Why this: System.Threading.Thread.CurrentThread.Priority = System.Threading.ThreadPriority.Highest doesn't work? I ran my app and checked it using the task manager process tab. It was checked as normal.

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"Cross-thread Operation Not Valid: Control 'TextBox1' Accessed From A Thread?

Sep 18, 2009

When i run the program i am getting the following error in this line TextBox1.Text &= "File Created: " & FullPath & vbCrLf"Cross-thread operation not valid: Control 'TextBox1' accessed from a thread other than the thread it was created on."

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Write In Worker Thread In A Data Table And Rich Text Box in Main Thread

Mar 4, 2009

I'm creating a Client Server application which involves theServer running some scripts in clients and getting back results in an automated way. In Server, other than Main thread, i have 2 worker threads, a) one monitoring response from clients and b) the other scheduling next available job to respective client which executes that job. The issue here is ,I want these worker threads to write the status of their work in the UI(which comes under Main Thread). Also i need to write things in worker thread in a Data table and Rich Text Box in Main thread. But, I can't do so, since it has been blocked to access one thread's function or property directly from others. Is there any work around to do this?

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Creating A Progress Bar That Runs On Another Thread While Keeping Calculation In Main Thread

Nov 12, 2009

Preface: I know this is an unusual/improper way to do this. I can do this with a "real" ShowDialog(), background worker/thread, and so on. I am trying to do specifically what I describe here, even if it is ugly. If this is impossible for X reason, I have created a fancy progress dialog for some of our long running operations. I need to have this dialog shown on a new thread while having processing continue on the calling (UI in most cases) thread.

[Code]...

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Cross-thread Operation Not Valid Control 'FormSplash' Accessed From A Thread Other?

Sep 5, 2009

I need your help on the following. In debugging mode only the program is stopping to the following line "My.Forms.FormMain.HelpProviderMain.HelpNamespace = "Reports.chm"" with the following error ""An error occurred creating the form. See Exception.InnerException for details. The error is: Cross-thread operation not valid: Control 'FormSplash' accessed from a thread other than the thread it was created on.""

I noticed that when I am putting NONE in SPLASH screen option in the properties of the project, there is no problem.I am no familiar with treating that's why can you give me detail instruction how to overcome this annoying problem?

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Cross-thread Operation Not Valid Exception In Single Thread Application?

Nov 14, 2009

I am getting this exception: Cross-thread operation not valid: Control 'TextBoxOutput' accessed from a thread other than the thread it was created on. in a VB 2008 Windows Forms application that I havent specifically made multi-threaded.  I have create a sub called Out() like this:

Private Sub Out(ByVal inString As String)
Me.TextBoxOutput.Text += (Me.TextBoxOutput.Text & inString & vbNewLine)
Me.TextBoxOutput.SelectionStart = Me.TextBoxOutput.Text.Length
Me.TextBoxOutput.ScrollToCaret()
End Sub

and I call it from various events to log messages I am getting from my pbx, which I use a third party open source dll to access. The interesting thing to me is that if I run the deployed application (ie, not in the VS IDE) I do not get any exceptions, it's only from within the IDE.if I add the line: Control.CheckForIllegalCrossThreadCalls = False to the form's constructor, the exceptions stop, but a) this seems like a hacky way to get around the issue and b) the application seems to hang sometimes when I have it set this way.

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Cross-thread Operation Not Valid: Control 'FormSplash' Accessed From A Thread Other

Sep 5, 2009

In debugging mode only the program is stopping to the following line "My.Forms.FormMain.HelpProviderMain.HelpNamespace = "Reports.chm""
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Cross-thread Operation Not Valid: Control 'hiddenrtb2' Accessed From A Thread

Mar 10, 2010

im getting this error and i cant figure it out.

Public Sub mlogin()
Invoke(chkb, New Object() {"disable"})
Invoke(d, New Object() {achidrtb, "", "="})
Invoke(d, New Object() {hiddenrtb2, "", "="})

[code]....

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Aug 27, 2011

I am trying to call a method that started on a background thread on the UI thread calling BeginInvoke and passing in a delegate as follows:

Dispatcher.BeginInvoke(Function() UpdateApplicationDataUI())

to call this method:

Private Sub UpdateApplicationDataUI()
...
End Sub

However, I get an error in the call to BeginInvoke (the UpdateApplicationDataUI portion of the delegate is stating "Expression does not produce a value").

Me.Dispatcher.BeginInvoke(Function() New Action(AddressOf UpdateApplicationDataUI))

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Jul 1, 2010

A BackgroundWorker thread can pass data to the primary thread. It does it via the RunWorkerCompleted and ProgressChanged events, which I believe run in the primary thread. I would like to encapsulate the BackgroundWorker control in a class so that I can instantiate it more than once.  But I don't know how the BGW can then communicate with the primary thread. If the BGW control is within a class, it does not have access to the properties outside the class. In that case, how can the BGW pass data to the thread that instantiated it?

[Code]....

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Current Thread Must Be Set To Single Thread Apartment Sta Mode Before Ole Calls Can B

Apr 21, 2010

I'm getting the following error:"Current thread must be set to single thread apartment sta mode before ole calls can be made"

I am using Speech.Recognition.SpeechRecognizer and using it to open various dialog boxes. It works fine for the first few but on the third one when it calls the InitializeComponent in the Dialog's New, it throws the above error.

Anybody have any clue what causes this or how to fix it? The SpeechRecognizer seems to run on its own thread, so that seems to be at the root of the problem. If I open thedialog with a button click I don't get an error.

[Code]...

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Jun 6, 2011

I am in a trouble with this error:"An attempt has been made to free an RCW that is in use. The RCW is in use on the active thread or another thread. Attempting to free an in-use RCW can cause corruption or data loss." I am not sure if the RCW-error is related to my problem but I was having this error last January 25. It appears when I am ending my application. I ignored it. The next morning when I resumed coding for my application, the changes I am making does not appear at run-time anymore. Whatever GUI changes I make in my application (at design time), it does not make any effect any longer when I am running the application. What is causing this? I am so afraid if I have to restart my application from the scratch. I have gone far.

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Error: The Calling Thread Cannot Access This Object Because A Different Thread Owns It

Nov 25, 2011

I have am using a Twitter streaming class library, and would like to update a listbox when a new tweet is posted.  I have it all set up to the point where a message box will show when a tweet comes in, but when I try to insert this tweet into a listbox I get this error: The calling thread cannot access this object because a different thread owns it.  I don't know what I need to do in order to insert this tweet.

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Oct 18, 2011

I have a small problem that I am sure is due mostly to my inexperience with threading. I have used simple entirely self-contained threads before, but not to a great extent. I understand the basic laws that surround them, such as how a thread cannot access another thread's member directly, and must use delegates.

[Code]...

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Oct 11, 2011

As we know, one STA UI thread creats the controls only canbe accessed in the UI thread in Winform application. And we need to call control.invoke or begininvoke to run the code in the background thread. 

Yes, below code in VB.Net , VS 2010 Winform project can throw the exception  "Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on."

[Code]...

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Oct 31, 2010

My routine to check for updates is run as a separate process. Exiting the application is required to update, so a dialog asks the user, when an update is found, if they want to exit now. f they do, the code (from the update thread) calls Application.Exit().However, if the FormClosed event of any form that needs to be closed needs to access its controls, an invalid cross-thread operation is detected (which sounds pretty logical).

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Mar 15, 2010

I was looking for a solution to run a lengthy job (looking for files on the fixed drives) withouth freezing the UI, and saw that using a BackGroundWorker control is the recommended solution.

Problem is, I don't see its ProgressChange event being triggered:

Imports System.IO Imports System.Text.RegularExpressions

Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Button1.Enabled = False

[Code]...

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Apr 1, 2010

I am using vb.net 2005In my form load procedure I am starting a background thread.The thread is declared as public.

Public
threadMonitorWMI As System.Threading.Thread
And started in form_load

[code].....

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Aug 4, 2011

I'm working with BackgroundWorker, I want the BackgroundWorker do the retrieval process of data from database while the user can still do another task on the form. The problem is, after retrieving the data, I can't seem to access the ListView in my Form from the DoWork event of BackgroundWorker, I will populate that ListView using the data I've retrieved.

Consider this example, this is how I'm doing it:

Public Class Test
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code].....

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Feb 15, 2010

My program crashes with the following error:Controls created on one thread cannot be parented to a control on a different thread.Purpose of the program is to add a control from a thread outside the main thread.Below is the code Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code]...

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