Get Background Workers Use To Make The Connections To The PLC's?
Feb 23, 2010
For my project I connect to a large number of variables in multiple Beckhoff PLC's. I connect to the PLC in the Form load event.But the first time connect to all plc's taking too long.The data from the plc's. be sent to my program can not cope with the private sub OnNotification. This is because the program is busy with making connections with various other plc's.If the program is fully launched it works ok, but I also want to start working properly.I solve it just with a timer and a counter. Each program cycle I make a connection, the next cycle the next etc.until all connections are made. This should be better.I would like background workers use to make the connections to the PLC's. bgworkers provide the connection.The main program is not blocked, and the incoming data from the PLC's can be handled properly In the form Load event I start the bgWorkers containing the code for connect and AddHandler. Unfortunately it will not work this way?
Imports TwinCAT.Ads
Imports System.IO
Public Class Form1
Inherits System.Windows.Forms.Form
[code]....
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Feb 13, 2010
I create two background workers in my program;
' set up the background workers
Dim Bgw1 As New System.ComponentModel.BackgroundWorker
Dim Bgw2 As New System.ComponentModel.BackgroundWorker
Bgw1.WorkerReportsProgress = True
[Code]...
Note, I've tried googleing, I've came across a article sateting that if you have to handle more then one task in the background, you should use System.Threading [URL]../showthread.php?t=101283) But I don't know what team mean with it?, or how you should use System.Threading to back your own 'background worker'.
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Apr 1, 2012
I don't really understand background workers much but would like to be able to use them in my programs, could someone give me an example with some good notes to help me understand how I might use the background worker with around 10 threads just to handle something simple like a math problem.
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Oct 3, 2011
I am a bit of a noobie with vb.net and I made this application that does a lot of http requests and stream reading. But when it does this it always freezes my application.So I did a little research and found that I could use background workers to solve this. But I have no idea where to start. So if you could look at my code and tell me where and how I can add background workers to prevent the freezing that would be awesome.[code]
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May 19, 2012
Okay so I've dug around all day and found that using multiple "background workers" would do what I would need for my application.How can I create 4 background workers and then feed the urls to the webrequest from a listbox? [code]
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Oct 30, 2009
How to use the background workers in my case. while my web cam is trying to start i want to show a progress bar.
Private Sub strcam_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles strcam.Click
mycam.startCam(PictureBox1.Handle.ToInt32)
End Sub
I tried many methods to achieve that without any luck. I tried also application.doevents().
I have a gif image that shows a circle go round like the one on vista. However when i use the application.doevents() the circle is shown BUT it start go round only when the web cam starts....I don`t know what to do.....I need somehow to perform two tasks at the same time. Can bagroundworkers used in this case or i need to do something else?
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Jan 26, 2011
I have been pulling my hair out trying to get this to work. If I step through the code in debugger it all works great. My problem is if I just run it, only the last task responds. I'm guessing I am overwriting the background working or something. I am sure I am doing a few things wrong but my code is now messy as I tried many way while searching. I know of the threadpool and .Net 4.0 tasks but having a hard time getting to do what I need.
Basicly I am writing a program (trying more likely) that takes a list of computers and pings then, then checks their uptime and reports back.This works fine in the UI thread (Obviously that locks up my screen). I can have the background worker just do this, but then it does each computer 1 by one, and while the screen is responsive it still takes a long time.
So my answer was to have a for loop for each server launching a new background worker thread. My solution does not work.I have seen other threads that I could do it, but I need to use with events to call code to update to UI when each is done.
What is the most simple way to do this?
Here is my code. Most is just copy paste + modify till I get it working right.
So In the main class I have the testworker.
(I tried using Testworker() but it said I could not do that WithEvents)
When I click the button the list loads.
Private WithEvents TestWorker As System.ComponentModel.BackgroundWorker
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
[Code]...
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Sep 7, 2010
I am dynamically creating an unlimited number of background workers and would like to handle errors from them.
In a try statement I am using the following:
Catch ex As Exception
'Me.BeginInvoke(New UpdateTextCallback(AddressOf Error_Text), New Object() {Message, Account})
Exit Sub
End Try
I have commented out the BeginInvoke command because I can not get it to work. I get an error the the handle has not been created. This subroutine is in a module and I can not figure out how to get the invoke to work.
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Jul 19, 2011
Using VB.Net and SQL Server 2008 R2: I have recently had a database that using sp_who2 reflects a connection ".Net SqlClient Data Provider" is still active even though the .Net application has closed and disposed of all connections.
[Code]...
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Dec 23, 2009
what libraries can i use to make http connections in visual basic? like cURL library for VB ?i am looking for something like cURL for visual basic.
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Sep 29, 2009
I just can't run any of Data sample codes that come embedded with VS2008. I'm trying running CreateDB example but I can't make it work.How can I configure Data Connections? [code]
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Sep 30, 2009
I have a little Windows Form application that uses sql database.My application works on my computer, but when I install the app to another computer I get this errorSystem.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was noccessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
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Jan 23, 2012
Basically after I queue all works, I want to wait until all I queued has been done. How do I do so?[code]I notice there is no way to know how many threads are still running in the threadpool.
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Jul 25, 2010
I have a server which has around 300+ users on it. Though the problem is that its coded in VB6, and if somebody has a bad ping, everybody has a bad ping. I need a tunneling server which will tunnel the incoming and outgoing connections and make there ping appear to be 0 in the server. Client to Server, Server to Client.
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Apr 3, 2012
I'm making a Shooter game like "1943" and "Jamestown". I was wondering how I would make the scrolling background to simulate moving forward and How would I make this efficient? I was thinking about using a animated GIF or to make a looping BitMap.
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Feb 18, 2011
I have hundreds of .gif images with white backgrounds that I would like to make transparent using a vb.net procedure.
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May 12, 2012
I want to make a PictureBox to non background color, when I change its backcolor to transparent its backcolor still black.
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Feb 6, 2009
This is the Trackbar in MS Office Picture Manager, I can't make a transparent-background-trackbar like it, when I tried to make the background transparent, it say that "this control doesn't support transparent color", the trackbar also always behind the toolstrip (I chose "Bring to front" from context menu).
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Dec 5, 2009
[code]....
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Jan 16, 2010
How can I make background window blur with code.just like when you open regedit in Vista or seven all background changes to black except the prompt window.I want to mimic this behavior but instead of just color black I want it to be the image of the background in blur view. How can I do this in VB 2008?
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Jul 4, 2010
My problem is that I have two pictures once the first has scrolled to the left with the last bit of the image on the right side of the form I need the next image to start moving from the right, then when the first image is completely of the screen it moves back to the right side of the screen and waits for the end of the second image and then the process repeats.Here is the code I put together so far.
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If picBackGround.Left + picBackGround.Width < Me.Width Then
[code].....
This code does not do what I want it bugs up for some reason if you can change this code or give me entirely differen
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May 23, 2010
I want to make my system is the only system in the windows the user Can use it like games
since i want to make the background of my system is Black [code]...
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Mar 10, 2010
How could i make it so the user can change the background on a form like he/she can choice from a list of backgrounds or add there own image as a background? also how could i make it so a button or a drop down button launches a form in the project itself?
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May 3, 2011
I am making a useful sticky program, i know Windows 7 has a similar one built in but it doesn't function the way i want. Here is an image: As you can see, i am having problems removing the coloration of the background application window. How can i make that transparent without affecting the image? My second question is, how can i dock my application window to the right hand side of the screen?
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Jun 28, 2011
I do have the User Control from a previous Visual Basic 6.0 project that allows certain colors to become transparent. But what I'd like to find out is, how can I make a certain color combination transparent using a User Control in Visual Basic 2008 Express?
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Feb 6, 2010
I have tried this:
For i = 255 To 1 Step -1
MyPanel.BackColor = Color.FromArgb(i,Color.Red)
Next
This will make the background color fade to transparent.The problem is, I don't want only the background color to change.I want to change the visibility / opacity of all the controls inside that panel too..
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Nov 6, 2009
I need to know how too make the background color on my splash screen because i need it round or fading out into whats on the persons screen.
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Mar 11, 2010
How would i make a program (in the background) preform a MOUSE click?
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May 16, 2010
I need to make a RichTextBox transparent in order to display a background for it.
So far I've managed to find a custom control for it, but when I scroll the text gets all messed up (the scrollbars are bugged too). how to fix this or how to make a standard RichTextBox transparent?
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May 20, 2011
I'm attempting to write a solution so that my user's can "watermark" their Images with their Company Logo. I've got the actual watermarking part done and working so now I'm creating the "upload logo" feature so that they can provide me with the Logo they wish to appear watermarked onto their Images.I'm using VB.NET and this will probably end up in a Web Service that accepts the Logo JPG file, and returns the "altered" Logo. What I need to happen in this Web Service is:
1) Gray-scale the image. Which I have working as well, thanks to this article.
2) Make the background transparent (so the logo looks clean when watermarked onto an image). This is where I'm stuck.
I think for the most part, any logos that are uploaded will have a generic white background but I can't assume that. Is there a way to somehow detect the background of an image or the background colors, so that I may make those colors transparent?So basically what I need is just a way to determine the background on an Image or even just the background colors so that I may make them transparent.
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