Creating And Starting Threads In A Loop With Parameters
Apr 29, 2010
I have ran into a situation where it would be a lot faster to create a thread by the users demand. Basically, what I have is some kind of downloading program which grabs URLs from the clipboard into a DataGridView. Now when multiple URL's have been added, it becomes really inefficient since only one URL is being processed at a time.Now what I wanted to do is, create a thread for each URL. The parameter for each thread are the URLs which are stored as strings inside the DataGridView rows.[code]
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Dec 30, 2009
I 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.
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Mar 15, 2012
The code works fine when I run it locally, yet as soon as I have uploaded to our dev server it doesnt run, but also doesnt error.I did some research and found that I should have the thread impersonate the WindowsIdentity, which I have done but still the thread does not work, I also tried increasing the max threads in IIS and still nothing.Im running IIS 7.5 on Windows 2008 R2.The method being executed on a new thread is in a class in the App_Code folder and looks like:
Public Class RosterEmailer
Inherits System.Web.UI.Page
Dim thisID As String
Dim thisName As String
[code]....
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Dec 17, 2010
Is there a way to start same Thread form foreach loop
Sub
For Each lvItem As ListViewItem In _ListView.SelectedItems
tThread = New Thread(AddressOf Me.myFunction())
[Code]....
In my case, when i select one item from list it is working fine...but when i select more than one files it odes not work.
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Jun 17, 2011
threads that watch folders and process files. This works fine, but every time needs change to add a new folder or just change some existing rules I have to go in and change the program. I want to builda front end that storesprocessing infofor each watchfolder. The program would then read the configs and build the threads based on them. I cannot find a way to loop through creating the threads.
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Mar 1, 2010
i have a for each loop i.e
[Code]...
if want that the loop stops while the player play a file until finished playback
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Dec 27, 2010
I have problem with multithreading.
For:
Code:
and multithreading to loop for:
Code:
How can I speed up this loop through additional threads?
I tried:
Code:
How can I do?
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Sep 28, 2010
To get pass the cross referencing error when running a thread, I use this code
[Code]...
But the AddressOf doesn't accept parameters... So how do I get pass that? Or is there another way to use delegate?
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May 30, 2011
Basically with the code below I would like to create multiple threads. Let's say user input was the number 100 for the "userVal" variable of type integer. With the first pass of the loop, starting with 1, I would like to[code]...
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May 4, 2009
I am trying to stop the following piece of code from taking up too much processing power of the PC by using threads. But I keep getting errors when I use threads:
[Code]...
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Jun 1, 2011
How do I make my program create new threads from a set amount? For example if someone typed "60" in a textbox and they pressed "Start", it would create 60 threads that would do the same function.
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Apr 5, 2012
I thought that creating a simple system service under VB .NET would be a piece of cake. Boy, was I wrong. First, I find general postings through Google that say you should use the Windows.Forms.Timer. Then, I found conflicting information that says you have to derive the timer from a timer class through code to make it work. Then, people are reporting all sorts of trouble using the various types of threads available. I can't debug threads using the VS 2010 Just-in-Time debugger for obvious reasons (although, I don't know if there is an alternate method to doing this).My project is an application launcher (similar to cron) that will fire off periodically within a certain amount of seconds. I am trying to use the Process.Start() method. I have a Beep() function as the first instruction, and the Process.Start, along with a Process.WaitForExit method to make it block as the last instruction. I had my code doing this through timers, but now I am starting to use threads. No difference in execution. The over-ridden OnStart method does kick off (as I am certain through debugging), but nothing ever happens when starting the service in production, as if it were ignoring all my code. Putting loops and logic in the OnStart method yields a process that won't start. I know it is a threading issue, but I also know it must be mandatory to use threads. I am now dumbfounded as to how to make this work. I am curious to know the solution.
In addition to the service class, I have a ServiceInstaller and ProcessInstaller implemented that I copied verbatim from MSDN.Here is some of the code I am trying to work with. Note that this simply reflects the current state of my code in trying to implement the logic within a thread instead of a timer (which to me would be optimal):[code]
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Sep 15, 2011
I have a loop that creates several threads as such[code]...
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Jun 21, 2010
I am having a few issues with a For loop statement, code below:
Dim y1 as integer = "12"
Dim y2 as integer = "24"
Dim y2a as integer
[Code]....
Problem i have is that it selects all records that have a value equal to or less than 24 rather than the records that have a value greater than 12 and equal or less than 24. This appears to be an error i am making in the use of greater and less than?
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Oct 19, 2011
I 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?
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Nov 24, 2009
I'm creating 50 picbox in code. they are named Area1_1 to Area 1_50.
They all have different XY position and different size, setup in % of the form width.
Like this:
Code:
Dim Area1_1 As New PictureBox
' Dim 48 other box...
Dim Area1_50 As New PictureBox
[Code]....
But it don't work. Probably because the controls is not added to the form yet...
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Dec 9, 2011
i have to create for loop that create each time a new GroupBox with new name and location this is not a homework.it is a personal Application to manage my information [code]i have to change the name of the first Dim in the loop each time , but i couldn't.
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Nov 15, 2009
I need to create a variable number of Group Boxes, at runtime, inside an existing Layout panel. The name of the Group Box also needs to contain the integer, from the loop, as part of its name. i.e x = 1 to 3 > GroupBox1, GroupBox2, GroupBox3
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Oct 15, 2011
I have some variables that are distinct by numbers, like in1, in2...If I have for loop, how would I access those variables, using the counter, and attaching it to the variable?I believe in JAVA, you could just use in+ct... where ct is the counter to access the variable.also how could you make a new variable in the for loop?Initially I had variables declare outside of the for loop. The problem was how to access those variables using the for loop.
var_nm1 = in1.Text
var_nm2 = in2.Text
var_nm3 = in3.Text
Dim nmList(2) As Integer
[code]....
This is object oriented programming, and I made the textboxes in1, in2, and in3 using the GUI editor. that was so easy.
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Apr 22, 2012
i have a web browser control, that refreshes pages on a loop after calling a few subs, i need to create a delay in the loop so that the page has a chance to refresh and redisplay before it loops again. i tried the code below, but it seemed to freeze the entire form, elements including, so the web browser didnt refresh before the loop, so how could i create a non form-freezing delay for a loop?
For count = 1 To 20
WebBrowser1.Navigate("URL")
simcheckcheck()
[code].....
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Dec 10, 2010
I wanted to draw a chart on a picture box. So I create a form, put a picture box on it, and then in the code of Form_load, I put a handler to the paint event of the picture box. This seems to create an infinite loop, judging from the behavior of the form.
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May 16, 2010
I am trying to populate a dictionary with objects created from data in a recordset, but am having difficulty with VB's object referencing. I am very new to VB. Pseudo code of what I am trying to do:
dim dict as Dictionary
rs = getRecordSet
while rs.moveNext
set myObj = new MyClass
myObj.properties = rs.relevantFields
dict.add myObj.getUniqueKey, myObj
wend
However, all 'objects' in the dictionary are actually references to the most recently created (and thus last) object in the dictionary. I know why what I am doing above is not working, but I don't know the correct way to do it so that each element in the dictionary is it's own object.
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Oct 19, 2011
VS 2008 Creating a Password Application with Do Loop
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May 2, 2009
I'm doing this right now - .Add'ing parameters and then at the bottom I'm looping through them and setting the Source column by just removing the "@" character from the parameter name.
[Code]...
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Jul 2, 2010
I would be grateful with some help with reading a text file into a Richtext box. The code I have at present appends the first line of text as I want it but the rest of the lines of text do not alter. I need a loop to read to the end of file and display in Richtext box. the code i have at present is this:-
[Code]...
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May 13, 2011
I'm writing a query to select all records that has any part of parameter. I have one table called Employees. Some people have name like this: John David Clark If the parameter is
[Code]....
I should be able to get result back as long as there's a match in the parameters. If I use Function Contains (q.FirstName & " " & q.LastName).Contains(employeeName), I will not get any result back if employeeName is "John Clark" Function Contains looks only for next words from left to right. It doesn't match a single word at a time. So that's why I used this in the Linq to SQL:
[Code]....
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Aug 30, 2010
I am getting error [07002] the # binded parameters < the # of parameters makers, i checked both parameters were perfect even though i am getting this error here is my code
[Code]...
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Mar 14, 2011
Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
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Dec 22, 2010
I am trying to create a simple program that will receive input from 6 buttons entered 6 times (That is, from a row of 6 buttons, pressing 6 of them in order) will produce some mathematical results. Depsite being new to the world of programming, I managed to write some code in VB 2010 Express that gets me to getting the 6 buttons of the first set using a for loop. However, I've been unable to make a difference between the buttons That is, each button will do that same thing each time it is pressed. This is the code I have so far:
Public Class Form1
Dim StartButton As New Button
Dim QuestionSet1() As String = New String() {"Ardor", "Passion", "Vigor", "Talent",
[code].....
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Feb 6, 2012
Basically Commands has Parameters and parameters has functions like Add, AddWithValue, and etc. In all tutorials i've seen, i usually noticed that they are using Add instead of AddWithValue.
[Code]...
since it saves my coding time. So which is better to use? Which is safe to use? Does it improves performance?
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