WaitHandle.WaitAll Runs Before All Threads Completed?
Jan 27, 2011
I'm working on a program that scans a list of servers for different information. Everything is working fine except sometimes I get errors when the threads are done. Either by the scan completing or the cancel button stopping the loop but letting the current threads continue.I see the UI say the scan is complete but the progressUpdate tries to run again.I can solve the problem by making a longer thread.sleep after the waitall.
Private Sub ScanIsDone(ByVal ar As IAsyncResult)
Dim d As PingDelegate = DirectCast(ar.AsyncState, PingDelegate)
Dim ScanResult As ServerInfo = d.EndInvoke(ar)
[code].....
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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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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 30, 2011
I just completed my app and used advanced installer to make a setup of it, i sent it to my brother for him to test but when he runs it and tries to sign in he gets these errors
[code]...
When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box.now i think it means that it cant find the mysql connecter and data and stuff but the user shouldn't need to have that right? it should come with the app to make it work for everyone
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Apr 23, 2009
let's say i finished my application.. it already has 3 images that when i click button1, form background image is red, button2, blue, button3, whatever color image u like.. ;o)
now the app is built as a .exe and i would like to add more images to be able to change the background image... is there a special folder that contains my app images, or are they embedded in my application?
or is there a way to update the exe with new images... this is a new field for me, so make it simple..
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Jun 25, 2011
I have installed vb.net 2010 express , but when I run It I get : "Error , the operation could not be completed".And I cannot do nothing with visual studio 2010.
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Sep 25, 2009
I have to install whole bunch of self extracting files every now and then.. so, I was trying to automate the process...
Using process.start ("filename"), i was able to run the exe file. After that i send Alt U to Unzip the content.. Finally the Self Extractor sends message "xx files unzipped successfully..." or similar...
Now, how do I find out the the extraction is completed or the msgbox "xx files unzipped successfully..." popped up ? (I don't like to go thru the window title as there might be other thing going on...)
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Feb 18, 2010
I want to highlight a control when it's not completed, something like a red border... how can I do this?
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Feb 21, 2011
Iv searched and searched on how to email your completed program but I never seem to find anything.
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Nov 20, 2009
My question involves async operations in VB .NET. Given the following:
[Code]...
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Mar 23, 2010
I am trying to call the DocumentCompleted event from a button click but am having problems.Here is my Document Completed event:
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs)
TextBox2.Text = WebBrowser1.Url.ToString()
[code].....
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Oct 1, 2009
I know that it is possible to download items with Visual Basic [Code], but I was wondering how I could sense that a file had completed its download. (IE: when the download was complete, another event could happen).
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Oct 19, 2009
I made an icon for my program and tried to implement it.Funniest thing though, I get a message with the error icon saying the operation completed successfully.But the icon doesn't change, nor is it my icon drop down box when I click the arrow. Ergo, it didn't complete successfully....I am using ASP.NET 2.0 and have read some about this error but I don't see any fixes I can do, aside from what I've tried already.
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Mar 15, 2011
I'm trying to develop an application which searches a sql server database. One particular search entered by the user actually sends seven queries to the database. I've designed it so each of the seven queries is conducted in a seperate backgroundworker, so that they run and return their hits concurrently. When the user enters a search term, a routine (runSearch) is called , which in turn causes each seperate backgroundworker to run.This work fine when the user enters a single search term.I'm now trying to allow the user to enter multiple search terms in a multiline textbox. I iterate through the lines in the textbox and call runsearch for each line. I assumed that the progam would wait for each call to runsearch to complete, before running the next.
I now find out this is not the case. When I call runSearch, the backgroundworkers are set in motion. The next line in the textbox then calls runSearch again, but the backgroundworkers from the previous calling of runSearch are still running. This throws up an error stating that the backgroundworker is still busy and cannot be called.I need a way to test that all of the backgroundworkers have completed before running runsearch again. If one or more of the backgroundworkers are still running
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Jan 19, 2006
I am running on the VB8 and expirienced an error during debugging after some changes in "My project" area. I have noticed (on two different machine) that after change for example Startup Form or Security Area, I am not able to debug program any longer. An error appears, telling me that:
The Operation Could not be completed.
After clicking OK (nothing else is available) and next try of debugging, another error message appear:
Visual Studio could not copy a support file to this location: "path". Please verify the path exists and is writeable. After that, I have to close Visual Basic and restart it. Than everything works fine...till next change of "My project"
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Oct 3, 2009
what do i need for the progressbar to fill when the webrowser is completed.[code]
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Feb 8, 2011
I am working on win32 application using Visual studio 2010 and Windows 7. Whenever I Click to "ADD" a "resource" to the project, I come across a messagebox with an error.. "Operation could not be completed. Access is denied".
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Aug 7, 2009
i am currently trying to create an expenses calculator, the sort that includes all your monthly outgoings and give you a total. I would like to be able to fill the form in the save it + reload it when i run the program again, what is the best way to do this ?
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Jan 31, 2010
Stop app closing if backgroundworker isn't completed?
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Mar 9, 2006
When using a process.start command to start a media player and play a song at a file location, is there a way programmatically to tell when the song or media has completed playing?
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Jul 10, 2011
Thread Completed Event Error
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Jun 17, 2010
I am trying to display the progress bar(marque) in a separate form (progressForm) while i do some calculation in background. I know the typical way of doing it is to include the calculation in background worker and show progressForm in main thread. This approach how ever will lead to lot of synch issues in my application hence I am showing the progressForm using progressForm.ShowDialog() inside the background worker process. But I need to trigger the Completed event with in the application to close the form.
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May 9, 2009
I want to create an If End statement like so...
If (webBrowser is finished loading) then
do some stuff
End If
and it needs be within Private Sub tags so it can't be
Private Sub webbrowser1_documentcompleted
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Aug 9, 2011
how do u find out if the progress bar is completed ?
I need to run a script as soon as the progress bar has been completed
its ProgressBar1
and once its been completed i want it to do
TextBox1.text = "this is a test"
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Jun 22, 2011
I have following code in aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test.aspx.vb" nherits="test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
[Code]....
Code Behind I do some processing in Page_load method and redirect to other page but it might take some time so I want to show user loading image.But it shows that after page_load is completed.How to handle this ?
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Apr 25, 2009
I have a program nearly completed that visits a web page, clicks a button, and goes on. My only problem is, I cannot find out to add the document completed event in a loop. Basically, it visits a web page, was the document completes loading, it clicks a button, but I can't find how to make it loop.
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Apr 19, 2012
I would like to make a text box that is self completed in accordance with the codeentered in it
Starting this code I would like to do my report on the same,is that for now I use the box checked for each individual code, but there are various codes and has no way to do one by one, the default report is the same for all the difference is only the Code (key) and therespective information
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Jul 27, 2010
I have to execute a stored procedure. When I execute that, I have to keep on check (ping) whether that execution is completed or not. The I will update a label.
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Nov 6, 2010
How would i know when a thread is completed running it's task? I mean in background worker it has a completed event, but can i make something similar to that?
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Jul 23, 2010
How do i do that ? I want to wait until the webbrowser has loaded the document and then add the document text to a textbox... How do I do that ?
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