Forms - Sleeping Threads - Just Freeze A Portion Of Code
May 4, 2009I'm trying to sleep a single thread of code, when i try using System.Threading.Thread, it freezes the whole app, i need it to just freeze a portion of code.
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.net - Multi-core Processor Pegged Even When All Threads Are Just Sleeping?
Mar 3, 2010I'm simulating some threading in a Windows Service, and the Thread.Start routine for each of my threads points directly to the following:
Private WithEvents CheckForOrdersTimer As System.Threading.Timer
Private Sub timerCheckForContracts_Tick(ByVal stateInfo As Object)
' Ticks every 5 seconds, then spawns threads until we're at our max
Do
[code]....
the threads aren't even doing anything yet, but with more than two threads running at the same time, my processor (Core 2 Duo 2.4 w/ 4GB) gets pegged and Windows gets really sluggish. According to what I've read, Thread.Sleep shouldn't be consuming any resources at all while it waits, but it may as well be running in a tight timing loop.
EDIT: Per the requests, I've expanded the amount of code I'm using. I was initially doing some database work before spawning each thread, but I've removed it and the processor maximization still occurs with just the code here (and, of course, the OnStart method for the Windows Service.
Multi-core Processor Pegged Even When All Threads Are Just Sleeping?
Mar 5, 2012I'm simulating some threading in a Windows Service, and the Thread.Start routine for each of my threads points directly to the following:
Private WithEvents CheckForOrdersTimer As System.Threading.Timer
Private Sub timerCheckForContracts_Tick(ByVal stateInfo As Object)
' Ticks every 5 seconds, then spawns threads until we're at our max
[code].....
Forms :: Pause A Program Without Sleeping
Apr 12, 2010The problem that I'm encountering right now is that I can't seem to get my program to wait for a couple seconds for another application to load before it starts to check if it's open. Here's what I've got (feel free to tell me its a terrible way of writing!):
Private Sub Running_Shown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shown
Main.Enabled = False
[Code]...
So if I don't have the sleep function then oasicer hasn't loaded and it says it's finished straight away, but if I call a 5s sleep then it crashes, and not for just 5 sec. Is there a replacement for this line? Something that would just delay going to the while loop?
Forms :: Parallel.invoke & Win Forms Freeze?
Nov 1, 2011i'm Using net 4.0 & i'm learning parallel programming ,i'm using parallel.invoke to run 2 or more methods with together at a same time but i want to update my UI ( listboxes ) while i'm running methods . i can do that with threads & delegates , but now i can't do that , this code is running well
[code]...
i dont know why me.invoke or listbox1.invoke wont work with parallel.invoke !
Forms :: Display Particular Portion Of Webpage In Form?
Feb 21, 2010Was trying to make a little project which will login to a site. The problem i am facing is with the captcha code display..
Was searching around to get the captcha to the form directly but didn't found anything useful.
So my question is how to display only the area of the captcha on the form instead of the complete form.
Like suppose I want to display only the portion where the logo of Visual Basic .NET Forums - The Exclusive VB.NET Community is located instead of complete webpage.
Application using : VS 2008
Answer expected for : VB 2008 or C#
Making Application Not To Freeze While Executing Code Or While Looping?
Mar 23, 2012i'm trying to make a simple email sender and the problem is that during the sending process my application freezes, therefore my progress bar also freezes so is there anyway i can try to make application not to freeze?
View 2 RepliesForms :: Working With Threads?
Jan 9, 2010Public Class ThreadSearch
Inherits frmStDetails 'Windows form which contains my control
Public Event finishedSearching()[code].....
This is the procedure I used to start the thread. It doesn't generates error but the problem is 'IT DOES NOTHING'.
Accessing Labels From Different Forms&threads
Feb 5, 2009Recently i was trying to access the labels of main form (Form1) from a thread that was running on the other form (Form2), and I have noticed, that the label.Text is not changing.Form1 code - after the main Form is loaded I launch the second Formular, and the method on it : [code]There is a sample code attached to show how is it working.Is there any possibility to change the label values on the Main window?Peter.
View 2 RepliesForms Running In The Same Application But On Different Threads?
Dec 9, 2009I have two forms running in the same application but on different threads. HdForm and DataForm. I have a class library whit datasets and a stack in it. Cause both forms (different threads try to rad from the same class library i use a synclock to syncronize. But it seems like the synclock dont work.I get random errors in the HdForm while reading from myAr dataset. It says index out of range. But i know for sure that the index exist (i have make sure of that). When i click on the visual studio play button then, it goes again.If the index was realy out of range then it couldn't go further. So i think the synclock does not work and thus the dataset is changed in time while im the loop reading from MyAr.
[Code]...
C# - How To Stop A PDA Sleeping
Oct 22, 2009I have an application for PDAs with a long running process, and I'm getting the problem that the PDA is going to sleep before the process has completed.
I haven't got any control over the power settings on the PDA, does anyone know a good way for my application to stop the PDA from going to sleep?
Forms :: Threads 'Conversion From String To Type 'Double' Is Not Valid'
Mar 30, 2011I have a application that writes and reads from a serial port.The com-port is opened elsewhere in the early stages of starting / running frm_Main and is not shown. I have a button1 on my form and when I click it, the module 'RTUValues_Get_IOData' executes perfectly ok, with no errors.[code]However when I call it via a thread [button2], I get the following exception error and it hangs, at the part shown above in RED"Conversion from string "" to type 'Double' is not valid."
View 5 RepliesMultithreading - Code For Running Multiple Threads?
Apr 17, 2010How to I run multiple threads in VB.NET? Say I need 2 threads - one that prints 100 numbers in a loop and the second one that asks for the user's name and prints it inside a message box.
View 1 RepliesUse "System.Threading.Thread.Sleep(15)" As The Delay Code But Freeze The Form
Jul 19, 2011I've been trying to use "System.Threading.Thread.Sleep(15)" as the delay code but if freeze the form. I used this "Location.Refresh()" where location is the name of the form, but it didn't give me what I need. This code is going to work on a ProgressBar while typing and the value of the progress bar change while typing. The progress bar jumps to the new value and I want it to move. So I thought about puting it in a "For ... Loop" but the whole form freezes.
[Code]...
VS 2008 Piece Of Code Involving Threads And Events ?
Nov 25, 2009This is a very simple piece of code involving threading and events. I am just refreshing the old grey matter as I find myself off work sick for a period of time.
Code:
Imports System.Threading
Imports System.Threading.Thread
Module Module1
[CODE]...
Service Will Not Stop While Thread Is Sleeping?
Feb 13, 2012I 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?
Multithreading - .NET 4.0 Execute Multiple Threads But Threads Are Completed Before Resuming?
Oct 19, 2011I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.
What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).
What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?
Queue Threads - Spawn A Series Of 'child' Threads From A Loop
Dec 30, 2009I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
Make Application Working Better And Never Freeze / Make Application Working With Any Count For Loop Without Freeze
Jan 19, 2012I'm using loop to read data from sql and then make some calculations then save it again to another table but when application loop for 3 or 4 times it's freeze but the job is done but if loop = 10 or more then it is freeze and hangup for long time .i need to learn how to make my application working better and never freeze and make application working with any count for loop without freeze .
View 7 RepliesVS 2008 Adding A Method To All Forms Existing Forms Without Changing Their Code?
Jul 28, 2009just wondering if it is possible to add a method to all forms in my project without having to do it on one form and Inherit all my other forms from that one
View 3 RepliesForms :: TextChanged Code And Button Click Code Not Working?
Jul 2, 2009I have made an application in VB.NET.The Button click codes are working fine. I have made a small modification in the code. I have commented the line 'Me.Close'But still my form gets closed. I think the application is executing from elsewhere.
View 8 RepliesWaiting For Threads - Thread.join Suspend Execution Of Code On Calling Thread Until Spawned Thread Finishes Or Is Aborted
Sep 2, 2010My 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).
Forms :: Write Code With Multiple Forms?
Apr 17, 2009I am trying to write code with multiple forms. The first screen is splash screen then is supposed to close and have a calculations screen. In the timer of the splash screen I wrote the following code
Option Explicit On
Option Strict On
Public Class uiHinsbrookSplashScreen
[code]....
This opens the second screen, but when I Hit Exit on the Second Screen The first screen is still open. What do I need to do next?
.net - Given A Large Number Of Objects, Create Multiple Forms In Designer For Them Or Use Code To Create The Forms?
Dec 29, 2010If I have a large number of classes, each similar to the other in certain aspects (they all share a common base class, but each does things differently), and I need to create Windows forms for each to allow easy changing of their values through a GUI? Create one matching form for each object in VS' forms designer, Or Use code to create the forms dynamically at runtime.
#2 makes the most sense to me, because a lot of these objects will share very common features of the form, notably "Ok" and "Cancel" buttons. But one object might need to draw a textbox on the form while another might need to draw a combobox. Not to mention, if I want to put icons on the "Ok" and "Cancel" buttons, I'd have to do this for each copy of the form in designer, and that sounds like it could get out of hand quickly.But is drawing forms through code sane? VS' forms designer is pretty sophisticated and designed to make life easier. Am I wise to consider ignoring its functionality and diving into the trench warfare of forms design through code? Or are there examples of automating form creation based on an existing object's properties?
Freeze The First Row?
Mar 27, 2011I have a dgv, I populate it, and I insert a row at the pos 0. And I want to freeze this row even when the user sorts the dgv.
How can I make this? The frozen property alone seems to be not enough.
My GUI Became Freeze
Dec 22, 2008Currently I have to retrieve over 2000 records from DB and bind with combobox. and then follow with another 3 retrieving (less than 20 records)
My problem is when I call this function, my GUI became freeze.
I try to use Application.DoEvents() method but it still didn't work.I read some post and pages, they mention about BackGroundWorker and .Net 2.0. But what i use it MS 2003 with 1.1 so i think i can't access BackGroundWorker.
Add The Decimal Portion Of A Number To Another One?
Sep 2, 2010How can I only add the decimal part of a number to another one?
example: if a number is A = 10.25
Then X = 30
Y = X + 0.25 (Here it added 0.25 which the decimal only NOT 10.25)
Another example, If X = 16.35, A = 102.001
Y = 16.351
Answered Get Portion's From A String?
May 13, 2009I was wondering what the easiest way is to get a portion of text from a string for example, you have:
"example1,example2,example3"
And i need to be able to get all three of the items separate:
"example1"
"example2"
"example3"
The length and number of items will change, I'm using a listview subitem
Eliminate Portion Of String?
Feb 29, 2012Lets say I have a variable: varEmail. It contains a variable equal to the user's email address, so it might contain a value likeNow, lets say I want to get just a portion of the email address, e.g. strip off the domain, like so:
View 5 RepliesExtract First Portion Of A String?
Sep 7, 2011I am trying to extract the first portion of a string up to the first SPACE or any non-numeric digit.I thought I could do it but the string may contain an alphabet in the front followed by varying digits of numerals, making it more complicated.Here are some examples of the string to be parsed and the expected results:
String[code].....
I would have to use a series of instr statements but the code would be much cleaner using RegEx.