I want to write code that complete task of putting 0 to 1000 via thread in listbox. I want to start 10 threads at startup and complete task.
All threads should work equally. Each thread will write 100 numbers. First start from 0 to 100, second from 100 to 200, third from 200 to 300, so on upto 10th.
I have written code but it has problem.
Dim num As Int16
Dim startLoop As Int16
Dim endLoop As Int16
[CODE]...
Currently I have a textbox with some words and the program randomly removes five words and inserts 5 textboxes below the main textbox for the user to enter his or her answers. The goal of the program is to help the user memorize the text on the program. They can hit a button and new words can be removed and the original words will return. This is so that user is not entering the same answers over and over again.
What I've done is I have created a Listbox and I want the words that are removed to be listed in the Listbox so that the user will have a wordbank to use and I want it to work so that when the user hits the button for new words then the listbox will replace the old words with the new ones.
I have a listbox with 1091 items in it, which I am adding during design time. Every time Visual Studio tries to save after I manually populate the listbox it will hang indefinitely. Is there any way around this, am I trying to add too many items to a listbox?
View 3 RepliesIm having a problem with putting a thread to sleep...
othread.sleep(system.threading.timeout.indefinite)
The error is :"Access of shared member, constant member or enum member or nested type through an instance, qualifying expression will not be evaluated"
The code is:
Code:
Imports System.IO
Imports System.Threading
Public Class In_Process
[code].....
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).
Right now I have a Email class that has all the properties of an email to send it, and then a SendEmail function which takes those properties and uses them in the following
Public Function SendEmail()
'Exception handling
Try
[Code]....
The loop goes through each email in the array to process its email, however with the multithreaded function I cannot call
"EmailArray(i).ThreadSendBatchEmail()"
So how do I call an objects method when its on a different thread?
And I'm making it multithreaded so I can easily pause the process, and because the program freezes when the send() function is working, this would resolve that.
How do I get the same data from one row into a listbox to be on the same line?this code is what I'm using to put data into the listbox:
Dim da As New SqlDataAdapter("select ESTID, JobName from Job where JobName = '" & strJobName & _
"' or ProductIDA = (select ProductID from ProductCode where ProductCode = '" & strMaterial & _
"') or ContractorID = (select ContractorID from Contractors where ContractorName = '" & strContractor & _
"') or Date = '" & dteDate & "'", connFabList)
[code]....
so using the webbrowser control, im trying to grab text from a webpage and have them listed into a list box
The webpage contains nothing except the following "red, blue, green". There is no html, just those three words separated by commas, and saved as a .htm file.
im new here and writing a program that will write and save textfiles, but it is not like notepad. I am using checkboxes, combos, and good old text boxes. I would like tomake it so, for example:
if checkbox1.checked then
textbox1.text = textbox1.text & "movie name is "Hot Tub Time Machine" by idk"
[code].....
ive been wanting to put some kind of self destructing code in my application that deletes itself after a given period of time. (like 2 weeks)
View 3 RepliesI'm having trouble with reading a .txt file line by line, converting it into a string, then putting it into a listbox. When I execute I get an error saying "IndexOutOfRangeException was unhandled" Here is my
[Code]...
This code was posted in Chit Chat and everyone is saying how great it is. I just have Visual Studio 2010 and no familiarity with VB6 so I thought it would be good to convert the code to Visual Basic 2010.
[Code]...
I'm trying to add items to a listbox from another thread, but am not getting any. [Code] I've verified that inside the FOR loop, in the UpdateUI method, DOES have the correct values, they just aren't being added. What am I doing wrong here?
View 10 Replies'Form 1- start a new thread and declare a new second form. Have it invoke before adding an entry. as this apart from "CheckForIllegalCrossThreadCalls = false" is a workaround.
Code:
Public Class Form1
Dim t As New Thread(AddressOf startanew)
Private Sub startanew()
[Code].....
I have the following sub:Private Sub AmIintheListBox1(ByVal datatoenter As String)'Note.- ListboxItemsCount is a variable in the listbox1 change event
[Code]...
I do not know how to do the search of the datatoenter in a listbox with more then one item. If the item is already in the listbox then exit otherwise add it to the listbox.Threaddisplay adds the data to the listbox which I can do when there is no item yet.
I've been trying to add to a listbox item from a different thread (thread 2) than the thread in which the form/listbox was created (thread 1).
When I check ListBoxItem.InvokeRequired from within thread 2 it is always false when ApartmentState.STA is set. When set to MTA I get an error. Thread 2 is a unique thread with different ID from thread 1.
What is frustrating is that at one point it was working fine, and then I changed some of the structure of the project and it has now stopped working (and I don't know which change caused this! It was a while ago).
This code is within a form class:
Option Strict Off
Option Explicit On
Imports System.Threading
Friend Class MainWinForm
[Code]....
this is going to be hard to explain but ill try. Question 1. Ok i have a list box with a few items, What i want for this example is to click a button and it will start on the first item and do: MsgBox ("this is item blah blah blah") then after that it will go to the next item and do the same and then the next and so on untill all have been done. The "blah blah" should be the item so if item was to say "hello" then the msgbox would say "this item is hello" I know this would be a lot of msgboxes to close, like if 50 items then thats 50 msgboxes to close, this is just for the example.
Question 2. Ok this is where ive tryed to learn but find it really hard (multithreading) Im wanting all to be multithreaded so all work at the same time, ive tryed a few times but the only way i see it is having a **** load of subs, like if i want it to use 10 threads then ill have to add the same code 10 times or somet, im not sure.
i have attempted all this and failed big time as my way was to get the first item and use that then remove it from the listbox BUT... with it being quite fast the 2nd 1 and 3rd 1 used the same item befor it was removed and to be honest i dont really want them removed. so my attempts took like 2-3 days that was a waste of time really. I Know this is a lot to ask but im in real need of it and these 2 things have driven me half mad.
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".
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()
[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.)
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
[Code]...
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.
[Code]...
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]....
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
I have a listbox and i populate it with data in my code like this on the page load....
[code]...
So say one item in the list is displayed Ted Jones (123) and its valuefield should be 123. Im just not understanding what i am doing wrong here.
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]....
I am using VS 2008 Pro and my ? is, I am trying to add lines to a listbox and keep getting Cross-Thread Operation not Valid exception. The code I am using was downloaded from codeproject. When I run this app, it works fine. I added it to my app and this is where the cross-threading problem occurs.[code]I am trying to convert mp3 files to .wav files. With the line above it works. With it out, the exception is thrown.
View 5 RepliesI have a textbox named txtWith (Amount where cash should be inputted) and I want the input to have comma. Example, if I input 1000, I want it to be like this 1,000. By the way, this is my code in the textbox.
///THIS CODE WILL DISABLE CHARACTER///
Private Sub txtWith_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtWith.KeyPress
'////////////////LETTERS DISABLED ONLY///////////////////////
If (Asc(e.KeyChar) >= 48 And Asc(e.KeyChar) <= 57) Or Asc(e.KeyChar) = 8 Then
e.Handled = False
Else
e.Handled = True
MsgBox("Please input numbers only!", vbCritical, "Error!")
End If
End Sub