Make Backgroundworker Work Automatically?
Jul 21, 2011
Do you know how to work backgroundworker with this code? The request would be as I pulled out of google with a background worker and if so it is possible to collect links from google pagination.
[Code]...
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Apr 30, 2010
I have been looping thru the backgroundworker, after running a few hours, i found out that it stop even though i did not call cancelasync(). Below is the code:
Private
Sub
SboT_BgWorker_DoWork(ByVal
[Code]....
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May 23, 2011
I have not used Backgroundworker before and this one has me stumped. I have run examples (this is based on one from MSDN) and read what I could find, but I just can't seem to make this work. I am sure it is something simple that is wrong with my code, but don't know how to go about troubleshooting it. What happens is that it goes to the startthread() sub dim the object and sets the two variables and then bypasses the last line that starts the worker process. I'm stumped.
Here is the original code that works just fine, but hangs up my app (hence the need to run a background process)Above the is an Imports RARNET to support this:
[Code]...
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Aug 21, 2011
this is my code:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
For i = 0 To 1000
[code]....
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Dec 2, 2009
I'm using the IsBusy property to determine when a backgroundworker has completed. In the RunWorkerCompleted event I assing the result of the RunWorkerCompletedEventArgs to a public variable within the module where the backgroundworker events reside. The trouble is, the IsBusy property occasionally becomes true before the public variable gets assigned the value of the RunWorkerCompletedEventArgs. I experimented with putting a Threading.Thread.Sleep(10) after the IsBusy property becomes true and it seems to fix the problem. But it really doesn't seem right that I should have to do this. What is wrong here? I have placed the backgroundworker events in a component that is instantiated from the windows form, instead of placing the background worker events within the code of the form itself.
Here is my code;
Function SendAndWait(ByVal IntegerArray() As Integer) As String
Component.BackgroundWorker.CancelAsync()
Do While Component.BackgroundWorker.IsBusy
[code]....
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Apr 14, 2011
I have a long running process running in a backgroundworker, and want it to report progress to the user, and update a checked listbox as the items are discovered. The reportprogress is called, and the statements executed (placing a break in the reportprogress routine), I can see the control valuse change, but the change is not reflected in the dialog. Here is the reportprogress routine I'm using:
Private Sub BackgroundWorker2_ProgressChanged(ByVal sender As System.Object,
ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker2.ProgressChanged
Me.newlabel.ForeColor = Color.Cyan
[code]....
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May 24, 2009
i want to use the following function
Dim
buffer() As Byte = System.IO.File.ReadAllBytes( ImageSourcePath)
inside a backgroundworker but it does not retunr any byte at all while if this is places outside the backgroundowrker it works files.
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Mar 27, 2012
I have a UserControl that has a ProgressBar on it. The purpose of the UserControl is to be able to show the progress % on the ProgressBar as text. To do this it uses the MyBase.Paint event. To make it work the ProgressBar is made invisible and the UserControl is 'painted' with an image of the ProgressBar and then the text is painted on top. The UserControl has a Value property that is passed through to the ProgressBar.Value property.
I use this UserControl in two places, on a Splash form (not a standard Splash Screen) and also on the main form of the application. It works on the Splash form but not on the main form - by work I mean that changes to the ProgressBar.Value property cause the ProgressBar to show its progress. The cause appears to be that in the Splash form case the MyBase.Paint event is called as a consequence of calling Me.Refresh in the Set procedure of the UserControl.Value property, in the main form case it isn't,
i.e. Me.Refresh isn't causing MyBase.Paint to run.
The main form has two BackgroundWorker components. The first gets called (RunWorkerAsync) from Form_Load after the Splash form has been shown. The BackgroundWorker.ProgressChanged event updates the Value property of the UserControl and it works exactly as intended. The second gets called as a result of a user starting an operation and again the BackgroundWorker.ProgressChanged event updates the Value property of the UserControl but MyBase.Paint doesn't run so the ProgressBar remains resolutely static.
Any ideas why it won't respond to Me.Refresh in one case but does in the other? Happy to make any of the code avaialble but didn't want to fllod the first post with reams of it. Here's what I think are the most relevant code sections. First the UserControl
[Code]...
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Jul 12, 2011
I have tried to write a simple function to bring an Internet Explorer windows to the foreground and then press F5 to refresh it using the dll function: Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Integer) As Integer
and then later call this function using:
SetForegroundWindow(processID.MainWindowHandle.ToInt32)
SendKeys.Send("{F5}")
However, when I tried to debug the code, the setforeground does not work.I am using a Windows 2008 (64 bit) so I thought I should use ToInt64 instead. However that did not seem to do the trick as well, when I called SetForegroundWindow, nothing seems to come up.
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Feb 2, 2011
I have an application that requires data be entered, and after entering, a button is clicked to process that data. Clicking the button works just as it should--the data is processed properly. In constructing a test module, I provide a set of data values, followed by:
btnWhatever.PerformClick()
Nothing happens. I have used this syntax for years, and it has always worked flawlessly. I have triple checked everything else and isolated the problem to the failure of the PerformClick(). The PerformClick() is in a test subroutine that does nothing but fill textboxes and labels with default data, then calls the PerformClick() on the button to begin processing. Again, the button works fine, the data is entered as it should be, but the PerformClick() does not fire the click event.
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Dec 14, 2009
in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
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Mar 13, 2008
I want my application to be able to communicate 2-way between the application on another computer and the host server which will be running on my computer.I want to use the BackgroundWorker built into vb to create a thing to make it listen for incoming messages, and also send out messages to the client.The client needs to listen and receive, same as the server, because both need to communicate with one another.I do not know how I can make it do either sending nor receiving.I would be using two different background workers to keep the code seperated and organized so that I will understand what code is for what.
I want the code to say that if i receive the message "Apple" without the "" and cap sensitive, then it will change Label1.Text = "That worked, word received Apple" or something similar to that. ( This is because I am ignorant and I want it to interpret the text sent through to figure out what the application is supposed to do, and last time I couldn't figure out how to make it do something when a certain text was received.
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Oct 6, 2010
Let's say a custom exception is thrown in the DoWork event for a backgroundworker. How do I pass the custom exception to the backgroundworker so that it ends up being the e.Error in the RunWorkedCompletedEventArgs?
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Oct 2, 2009
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How do I make it when you type in a number above or below 1 and 100 the messagebox comes up? I can only make the msgbox come up after Ive clicked the button, how do I make it automatically come up when I try to click anywhere else?
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May 28, 2012
How could you make a script that automatically email you. Not having to open up microsoft programs and just sends it?
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Jun 9, 2011
I want my system to run when the computer boots.
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Apr 10, 2011
how to make button click automatically ...only single click....vb.net
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May 8, 2009
I have a program and i want every time the timer ticks the mouse clicks on its own but how would i get it to click?
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Apr 27, 2009
I have a web browser on my form and it is definitely big enough to warrant a tab control, with the web browser being on the second tab. I have a button on the first tab that should have the browser navigate, but how do I make the program automatically switch to tab 2? i.e., this is what happens:
1 - user is on tab 1,
2 - user clicks a button on tab 1,
3 - the program does what it needs to do and automatically switches to tab 2
For instance, here is the button that will be clicked:
Private Sub swap_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles swap.Click
If video = False Then
[Code].....
So the button will make the web browser go somewhere, I just want to have the form switch to the other tab automatically so that the user doesn't have to do it. I tried using webbrowser1.focus() to no avail. Is there a tab switch?
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Mar 7, 2010
I don't need this declaration because it only makes my code big and unreadable.Is there a way to make Visual Studio (VS) not add it automatically. Every time I remove it, it is added back by VS.
Function DoStuff(Tom As String) NOT Function DoStuff(ByVal Tom As String)
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Jun 8, 2011
how to make the timer automatic execute a code weekly?The timer will automatic generate a report for every monday(8am),how 2 do it?
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Jan 24, 2010
Is there a way to make a gallery that loads a directory automatically?like no browse.
lets say opens folder/images1
and list all images(pictures not names)
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Jan 20, 2010
How do I make a multiline text box that scrolls automatically down Everytime the box is full?
Note : The textbox is read only. So the one who adds sentences is the computer. Just like a chat box. I Have a scroll bar.
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Jul 21, 2010
I have a form containes some controls (buttons) how i can make the program auto-scan these controls one by one automatically and whenever the mouse on a button the button select for a time and I can press the enter key to click this button otherwise the mouse will go to the next button and so on.
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May 24, 2010
Public Function debugOutput(ByVal type As String, ByVal StringToOutput As String) As Integer
Debug.Items.Add(type, StringToOutput)
Return 1
End Function
For some reason only the 1st string appears(type) and StringToOutput doesn't appear at all. also how would i make a listview control automatically scroll to the bottom
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May 23, 2010
How would i make a program automatically align to one side of the screen, and fill the whole side? (Like windows sidebar).
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Dec 20, 2011
i just want a program that start automatically.
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Dec 7, 2011
how do you make a richtextbox scroll down automatically when text fills the screen so that the new line can be seen,
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Apr 5, 2012
I want code for RichTextBox when I write text it make space automatically before and after some character like Spacial symbol example , I write in RichTextBox this statement :
array()={1,2,3,4}
when I press ENTER this statement change to :
array ( ) = { 1,2,3,4 }
make space between spacial symbol and other character automatically
How I do that In VB.NET 2008?
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Jun 4, 2011
I have a program that outputs a series of items onto a form--an "invoice" if you would like. The problem is, when the user enters in more items than the invoice's size can handle the rest just disappears into the mysterious realm down at the bottom. Is there a way where I can make the label automatically detect items going in and create a vscrollbar or something similar so that it can accommodate it's size?
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