VS 2010 - Want Background Worker To Use File Copy?
Aug 17, 2011i want background worker to use file copy, how?
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VS 2010 Using A Background Worker?
Nov 10, 2011I want to use a background worker control in my application, and have it report progress to a Progress Bar It will download data and stuff, and I want to be able to change the text on a label.
View 2 RepliesVS 2010 Accessing Webbrowser From Background Worker?
Feb 19, 2012I have some code that gets the documenttext of the current page in the browser, the trouble is that im trying to use it in a backgroundworker so the ui remains responsive. Everything works fine as is If I run from a button click event, but in the background worker I get errors when trying to use the webbrowser.
'if urltocheck is blank use hidden webbrowser to get page text
If urltocheck = vbNullString Then
'make sure browser isnt already loading
[Code]...
Thats the code how do I make these calls the the browser from the backgroundworker? Or how I can I run an enormous for loop from the ui thread, and still keep the ui responsive?
VS 2010 Datagridview/Background Worker (ByVal)?
Jun 19, 2012It's always been my understanding that ByVal means is that you are passing a copy of a variable to your Subroutine. You can make changes to the copy and the original will not be altered.So if that's true I have two questions- How is my DataGridView updating without me passing the arguments back to it- The backgroundworker works fine as long as I don't reorgnize the columns in the datagrid.
'I pass the rows of my datagridview to the background worker
bgwGetHostStatus.RunWorkerAsync(dgvMonitoredSites.Rows.Cast(Of DataGridViewRow).ToArray)
'It grabs a website name from the IP column and reports if it's down or not in the status column. Now if
[code].....
VS 2010 Standard Thread Vs Background Worker?
Apr 25, 2012I have a application which processes 1000's datas.. for each processing it needs to update gui and db and many variables in my application. So what i have planned is to use 50~90 background worker with my own algorithm of thread pool, synchronization and thread close.So here is it efficient in terms of memory and performance. just confused what to use.. backgroundworker componenet or standard thread.
View 11 RepliesVS 2010 Adding Child Nodes In Background Worker?
Aug 25, 2011I i'm attempting to add child nodes to a treeview inside a background worker's doWork() method.
I'm getting an exception because I'm in a different thread, and need to use the invoke() method.
Can anyone point me in the right direction?
Copying Large File With Background Worker?
Aug 30, 2010I'm trying to browse for a large file and copy it with a background worker but get the folling error:"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process."
Code:
Private Sub BW_CopyEXE_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BW_CopyEXE.DoWork
Dim fullFilename As String
[code]....
Read .doc File To Textbox With Background Worker?
Aug 12, 2010read .doc file to textbox with background worker?
View 1 RepliesUploading A File Using A Background Worker Class
Apr 16, 2009I am having difficulty uploading a file using a background worker class...I've noticed that it is unable to transfer files like "mp3" ".exe" and others...although my application works fine on ".txt" and '.doc" and similar types otherwise it throws the following error following is my code for FTP...Also would like to know that the builtin FTP libraries are capable enough to make a FTP class application with RESUME capability? my files can be huge like 80MB to 100MB. [code]
View 3 RepliesWPF Background Worker Not Recognizing Worker Object
Mar 11, 2009I have the following code that adds a background worker into a VB.net WPF project:
Imports System
Imports System.ComponentModel
Imports System.ComponentModel.BackgroundWorker
[Code].....
And I get the following error for the DoWork worker event:
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
It seems like it's missing something in the Event declaration, but can't find it.
VS 2010 Background Worker Cross Thread Operation On Active MDI Child
Dec 11, 2011how to put this on a background worker without getting cross thread errors??? trying to upload a childform object values to an access db.I don't work in IT,Our company's LAN so slow that it takes around 3~5 seconds trying to update/insert values in access using the code below so putting it on a background worker i think makes the app immediately usable once save/upload's called unless otherwise somebody could suggest a faster way to speed things up.[code]
View 2 RepliesVS 2005 - Error - Using A Background Worker To Read A XML File And Do Stuff In A Database
May 6, 2009I'm using a background worker to read a XML file and do stuff in a database i get nothing in debugger but when i run it i get this error... how can i find out where and what is wrong? Exception has been thrown by the target of an invocation.
View 6 RepliesMultithreading - Load Data In Background Mode Using Background Worker?
May 3, 2012I am using query from a SQLite database as the AutocompleteCustomSource for a ComboBox. Also, I want to load data in separate thread. My LoadData method works fine when called directly, but it fails when it is called from the BackgroundWorker thread. When it is called from the background thread, it throws a Specified cast is not valid exception on the csearch.AutoCompleteCustomSource.Add(hh("Taj")) line. Below is my code:
Sub LoadData()
Dim connetionString As String
Dim cnn As SQLiteConnection
[Code].....
VS 2010 - Background Worker - Display A Label To Say "Done"
May 16, 2012I have a an idea of how a background worker works but I was hoping someone could give me some advice. If I run a background worker, and in the Do work if I run some coding which edits a file, and in the RunWorkerCompleted I display a label to say "Done". Will the label only say done once the coding for editing the file has completed OR do i need to put this code inside a process or something similar? and the label will only say done once it says process. close?
View 5 RepliesUsing A Background Worker?
Jul 15, 2011I'm writing an application in Visual Basic Express 2008, part of the function being to walk through a folder structure starting from a user specified folder. In my research, I found this thing called a background worker which seemed an appropriate tool to use given the potential size of a target folder structure. I successfully installed the two examples from the library here, and believe I understand the principles involved. Even so, having tried to build this feature into my application, it seems as though it is not working as expected, and, as predicted, debugging a multi-threaded application is a pain in the extremity.
I have this fragment under my "start" button click event -
HomeSource.Enabled = False
HomeCopy.Enabled = False
HomeReport.Enabled = False
[Code].....
What Is A Background Worker
Jul 18, 2010im thinking just because an app has been sent ton system tray does not mean its a "back ground worker"
View 1 RepliesCopy A File In The Background And Monitor Its Progress?
May 24, 2012i am trying to figure out how to copy a file in the background and monitor its progress.
in VB6 i used the FileCopyEX API
so i wrote a quick application in VB6 that used the API, then opened it in VB2008, so it ran the upgrade wizard
i get one error message after the wizard runs
'UPGRADE_ISSUE: Declaring a parameter 'As Any' is not supported. Click for more: 'ms-help://MS.VSCC.v90/dv_commoner/local/redirect.htm?keyword="FAE78A8D-8978-4FD4-8208-5B7324A8F795"'
Public Declare Function CopyFileEx Lib "kernel32.dll" Alias "CopyFileExA"(ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal lpProgressRoutine As Integer, ByRef lpData As Any, ByRef pbCancel As Integer, ByVal dwCopyFlags As Integer) As Integer
.net - Progress Bar With Background Worker
Jun 7, 2012my backgroundworker as I just cant get it to work. Basically I have a backgroundworker which does a few tasks but I'm trying to implement a progress bar and a label. I'm going to set the maximum value of the progress bar to 10 and then have it updating as I move with each task, also I'm thinking of a label with the progress bar which will display the progress ie
[Code]...
Add Progress Bar With Background Worker
Oct 7, 2009I'am trying to make app that will show every file in C:[code]Now how can i add progress bar with the background worker.
View 31 RepliesBackground Worker RunWorkerCompleted?
Nov 20, 2008I have a background worker that used to fire its RunworkerCompleted event when its DoWork routine finished querying a database and writing its output to a file. The bg worker was in a class called Query, which was called from another class called Trigger. A new Trigger Class was created for each monitored event. In this class, there was a structure which stored the config of each Trigger. When this event was triggered (set to TRUE) a new query class is created and it is passed the Trigger class. When the database query, file writing was done, the query class and all its rsources were diposed from the RunWorkerCompleted EventRecently I changed the application so that a new trigger class is not created for each monitored event. There is a single instance of the class but new config structure for each event. When a particular event is trigger, jsut the config structure is passed to a new query class and the sma ething is done in the query class. I just noticed now that the RunWorkerCompleted event is not being fired anymore.
View 5 RepliesBackground Worker And A For Loop?
Apr 15, 2009I have an issue that I can't seem to find a straight answer for anywhere... I have a For loop that sends a file name to a background worker that contains some long running code and I can't find a way for the parent thread to wait for the background worker to finish... Here is the example code:
For 4
BacgroundWorker1.RunWorkerAsync(fileName(i))
Next
[code].....
Background Worker In Vista Vs XP
Sep 21, 2009I have run into this before, When I develop a form to use a background worker to fill tableadapters, the background worker does fine on machines running Vista, but if you run the same thread on an XP machine, the thread gets hung.All the thread is doing is filling a table adapter like this.[code]Why would this run on a Vista machine and not an XP machine?
View 1 RepliesBackground Worker Not Working Right?
Apr 27, 2010I have created a background worker to go and run a pretty long task that includes creating more threads which will read from a file of urls and crawl each. I tried following it through debugging and found that the background process ends prematurely for no apparent reason.
While Not myreader.EndOfData
Try
currentRow = myreader.ReadFields()
Dim currentField As String
[code]....
This first bit of code is the loop to input from file and this is what the background worker does. The next bit of code is where the background worker creates threads to work all the 'landingPages'. After about 10 threads are created the background worker exits this sub and skips the file input loop and exits the program.
Try
For Each landingPage As String In landingPages
pgbar.Timer1.Stop()
If VisitedPages.Contains(landingPage) Then
[code]....
Also my main thread runs a forms from where this background is called to run but the main thread is supposed to wait for the background process to end unless the user selects another option from the main form.
Background Worker With Several Forms
Jan 11, 2012I've been experimenting with background worker to maintain responsiveness and to allow the UI to update while things are being done in the background.I've been having problems getting the background worker to do anything with form controls.For simplicity lets say I have form1 and form2.The background worker is on form1Initially I couldnt get it to edit controls on form1 but by using [code]However the problem came when I tried to get the same background worker to update controls on form2, in this case a text box. With the above code there is no error but it also does not update the text box.Is there an easy way to give a background worker access to multiple forms.
View 4 RepliesHow To Kill A Background Worker In .net
Mar 10, 2011i m trying to kill a background worker in the do work event of the worker i was using
backgroundworker.CancleAsync()
but its shows an error saying tat CancellationPending does not allow
how can i kill a background worker after its work gets completed in its do work event
How To Know If Background Worker Is Already Cancelled
Dec 30, 2011currently, i have this code: My_BgWorkerB is the Name of my BackGround Worker
If My_BgWorkerB.IsBusy Then
If My_BgWorkerB.WorkerSupportsCancellation Then
My_BgWorkerB.CancelAsync()
[code].....
Pause A Background Worker?
Apr 16, 2009Is there a way to pause a background worker? What I need to do is pause a background worker when it encounters a file error, wait for a few seconds, and then carry on.
View 2 RepliesProgress In A Background Worker
Jun 7, 2012I have a backgroundworker which does a few tasks but I'm trying to implement a progress bar and a label. I'm going to set the maximum value of the progress bar to 10 and then have it updating as I move with each task, also I'm thinking of a label with the progress bar which will display the progress ie [code]
View 3 RepliesRun A Function As A Background Worker?
Jun 6, 2010I have a function it is called ReLoad()
How can i run it as a background worker? so it can run in the background where it does not effect my current running function - basicly so the form will not freeze at all.
Using Progress Bar With Background Worker In VB?
Jun 12, 2011I am developing a VB application along with MS Access... When I initially load my form I need to put my application to sleep for 3 seconds or else data wont load properly. So for this 3 seconds I would like to show a progress bar displaying a message "Please wait" I tried using background worker but did not find any success... I have gone through many tutorials but for some reason could not accomplish the task.
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