I'm having trouble checking the completion of multiple threads before executing more code.As an example, I started two threads:
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Dim Thread1 As New System.Threading.Thread(AddressOf wordpress_checker_thread)
Thread1.Start()
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how to increment a progressbar relatively to the completion of a thread?
View 6 RepliesCan i put my app in some kind of wait state for a certain key on the keyboard before continuing? But that key can be targeted to any window, not just my app. My app would be out of focus and i hit that key on the keyboard and it would act.
View 7 RepliesA long time ago, on a PC far, far away from Windows, one MS-DOS program (the father) could run / execute / spawn another MS-DOS program (the son). When the son terminated, it could set a return code which could certainly be interrogated by an MS-DOS batch program or, I think, by any father program that invoked it (depending on the language in which that program was written). I have a small utilility which I want to invoke from my application, and, since that utility sets a return code, I would like to interrogate it in my application when the utility terminates. I've looked through the MSDN Library but could not find anything that seemed to cover this situation. Is there a way to do this in Visual Basic 2008 Express
View 2 RepliesOut of curiosity, is there a way i can make a program stop or pause for a period of time (which i would choose) before continuing the code WITHOUT a timer.I think I've seen this done before, but I'm not positive.Also note that I'm talking about a forms application (not a console app if that would be any different.)
View 3 RepliesAfter installing SP1 of Visual Studio 2008, code completion shows all types when an object member shows the parameter list. Before SP1, parameter list would only show related types.Take a look at this image for an example: This happens on a Windows 7 and Windows XP machines I have, all services packs installed.
View 1 RepliesIm trying to do this
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But it will just skip to the last status (Label3.Text = "Status: Welcome")
im trying to terminate a threading.thread using thread.abort the thread runs a download connection so is usually in the middle of socket.recieve or socket.send or socket.connect when aborting i just want to terminate the thread no matter what thread.abort raises an MDA excpetion. so i ticked it off in the debug exceptions menu. now it doesnt raise an exception, but the thread simply wont terminate. my program wont close unless i press top in the debugger.i cant pause downloads because i cant terminate the thread this code wasn't working?
Dim vT As Threading.Thread
For Each vT In clsDownloader.DownloadThreads
If Not vT Is Nothing Then
vT.Abort()
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as for the exception concerning threads being aborted from other threads being dangerous, how is it possible to send a message from a main thread to another thread to abort itself? as far as i know the only way to a abort one thread from another is to just kill it (because i dont know of ways for a thread to communicate with another).
I'm firing a thread to unzip a file. I need some way of indicating to the parent that the unzip thread has ended. I've tried raise event in the unzip thread to a sub in the parent but this runs the sub from the unzip thread. With ApartmentState set to STA, so that I could use a save dialog, this was OK until I displayed a messagebox which was hidden behind the main UI(and whatever I did I could not get it to the front).
View 11 RepliesIn 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()
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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".
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.
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()
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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.)
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
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
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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)
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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).
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.
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.
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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
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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:
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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
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
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I have a little log in screen that pops up if a user selects a certain item on my main form. How do I get my code to stop executing til my log in form closes?This is what I am doing so far. Basically i want o execute the code after MyLogin closes.
BMSSplash.MyLogin.Show()
If isLoggedIn Then
BMSSplash.MyBuddy.Show()
Cursor.Current = Cursors.WaitCursor
End If
I have coded a low-level mouse hook. Each time the user clicks (let's say) the left mouse button, a custom event gets fired which is then handled by a form in my application. On the form is a ListView control with the following columns: Time - Application - Button.
I want that ListView to contain the last 1000 mouseclicks made, so each time the CustomMouseClickEvent gets fired, I check for the itemcount of the ListView, I add an item to the ListView and I resize all three columns. Problem is however that this extremely delays the processing of the mouseclick messages.
I'm wondering if it's possible to raise the CustomMouseClickEvent and then handle it in my application while at the same time the mouseclick message is passed on to the next hook to get processed by the systen?
I've been having a problem lately where if I call a sub with a msgbox.styleyesno, it won't go back to the original sub that called it. This is my code:
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I have a button on a form and 3 comboboxes, each populated with a list. The outcome I'm attempting to programme is, descriptively; Button Click
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I have something like this:
For Each Entry In CheckedListBox1.CheckedItems
SheetName = Entry.ToString()
Form2.Show()
Next
but I don't want to continue the loop until Form2 is closed. I tried something like this:
For Each Entry In CheckedListBox1.CheckedItems
SheetName = Entry.ToString()
Form2.Show()
Do
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But that just froze everything and used up all my CPU.
continuing my project my AV can detect viruses by its filenames.. or fileextensions.. and its a incorrect form of detecting a virus..how will my program detect viruses by its behavior?.. least the common viruses like worms and trojans..
View 1 Replieswhen you start a new projekt, vs2010 makes a new folder for the projekt. when i reach a certain point in my projekt i want to save that version of the projekt.
what i do is make a new folder and copy that projekt to it. projektfolder2 . when i start the projekt in the new folder the sln doesnt work anymore. the vbproj works then. and vs 2010 makes a new sln file one directory down of the old one between the other
projekt files.
I'm trying to run a batch file via VB and I need to wait for it to complete/exit before progressing. The issue I believe I am having is that when a batch file is executed, it opens cmd.exe and not the batch file.
This is what I am executing with VB
My.Computer.FileSystem.DeleteFile(My.Application.Info.DirectoryPath & "PingCheckmachines.txt")
FileCopy(My.Application.Info.DirectoryPath & "machines.txt", My.Application.Info.DirectoryPath & "PingCheckmachines.txt")
Dim psi As New ProcessStartInfo(My.Application.Info.DirectoryPath & "PingCheckgo.bat")
psi.RedirectStandardError = True
psi.RedirectStandardOutput = True
psi.CreateNoWindow = False .....
The problem I am having is that it will just delete ping.bat before it completes.
How do I go about monitoring the process from the batch file I call. Then once it exits, continue with the script?
I'm writing a simple program that takes a screenshot of tab1 of the GUI, then takes a screenshot of tab2, then tab3, etc. I've got the screenshot code down pat, but the problem with my current code is that it's taking the screenshot of each tab before the screen has a chance to fully redraw, so the resulting images are screwed up.Is there a way to get the program to wait for each tab (and all the controls in it) to be fully visible before each screenshot is taken?I'd like to avoid using a timer for this, as the screen redraw speed will vary depending on the user's computer, and the contents of each tab, etc.[code]
View 2 RepliesI'm currently making a Computer Cleaner, my program launch's rundll32.exe's to clean IE's history.
Like to clear the add-on settings I would put:
Shell("RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 4351")
But I need to wait for it to wait before letting it to go on to the next thing like clear cookies, which would be: Shell("RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 2")
