Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
View 3 Repliesusing a backgroundworker to accomplish database update it takes about 30 minsbut when I minimize the screen or someone remote access my computer it cause freeze screen of my application .Although process workes fine and application is running in background but UI is disable and saying "not responding"
View 2 RepliesI'm trying to find a way to make backgroundworker do what's in the webbrowser. There is a time-consuming part in the webbrowserdocumentcompleted event that I want backgroundworker to tackle. Unfortunately, I don't know how to link that part to backgroundworker so that BW can do that job instead of webbrowser.
Here's what in the webbrowserdocumentcompleted event:
Sub WebBrowser1DocumentCompleted(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
If CheckBox1.Checked = True Then
[CODE]...
The time consuming part starts from line 2 to line 30. My program freezes whenever webbrowser tries to do this job, so I need BW to do this specific job instead.
Of course, it's nice enough to unfreeze itself when the task is completed. I have must at looked at this code for 2 hours, and still can't find the bug.
Imports System.Threading
Public Class Form1
Dim PathAmount As Integer = 0
[code]......
I'm filling a FlowLayoutPanel with PictureBoxes at runtime, each picturebox has an image from the List(of Image). Depending on the selected folder, loading the images "freezes" the program, so I want to use a BackgroundWorker. I'm having problems with "Cross-thread operation not valid". I want to fill the FlowLayoutPanel with the images from selected folder and a ComboBox with the names of the files.
View 4 RepliesI'm trying to find a tidy way to set a string using an if else statement according to a numeric value. The only complication is that there is a possibility that this value may contain text. So it needs to handle that situation too.
So this is the basic code:
If cint(QtyShop) > 0 Then
msg = "Stock found in this shop"
ElseIf cint(QtyAllShops) > 0 Then
[code]....
I have a program I made in VB 6 which has probably hundreds of thousands of lines of code.
Is it complicated to convert it to VB.Net or is it not worth it?
My main problem is that VB 6 doesn't work in Win 7 so I need to use the XP emulator each time I make an update.
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.
I have an interesting project that i would like to complete. I have a batch file used to ping our locations. Has 1 simple input but i dont understand how to get this to work in visual basic 2010.
View 19 RepliesI am a total bginner to vb.net programming. I am trying to make a simple program that allows the user to
1.change desktop background
2.Allows the user to select a boot image listed in the form
3.alows the user to enable disable the task manager,registry editor and control pannel.Replace Windows Boot image (Picture source is a picture box in form)
4.Change XP Start Button Text
5.Disable/Enable Windows Keys
so this is how far I got;
Imports Microsoft.Win32
Public Class Form1
Implements IDisposable
[code]....
I am refining my VS2010 control renderers and I'm working on the TabControl at the moment. If you take a screenshot of the VS2010 IDE and zoom in on the background of the TabControl (where there are no tabs), then you might see that it consists of a pattern of dots with a slightly different color than the surrounding background. I am trying to draw these dots (yes, I'm going for perfection), but I cannot find a brush that allows me to do this.I am pretty sure I'd have to use a HatchBrush with the right HatchStyle, but I cannot find a matching style.Here is a screenshot showing:
1. The VS2010 background I'm trying to draw (higher contrast and brightness otherwise it's hardly visible),
2. The HatchStyle that is closest to this (DottedDiamond)
3. Why this HatchStyle is not correct (it's missing dots where the green dots are, which I photoshopped in).
Now of course I'm going to have to draw the pattern twice (there are two patterns, offset by 1 pixel, with a slightly different color), but the more pressing problem is the green dots seen in the third image. They aren't there with the DottedDiamond style, and no other style (I think I've tried them all, but hey I might have missed some..) produces a better output.
Does .NET have built-in techniques for more complicated forms of iteration like the following:
1. Iterate over rearrangements of a list.
2. Iterate over subsets of a list.
3. Iterate over all indexes of a multidimensional list.
4. Iterate over all "combinations" of a list, i.e. all subsets of a list of a given length, where subsets that differs only in their ordering occur only once total.
I recently had cause to do (1) and my method was ugly, slow, tedious, and generalized poorly, which is why I ask. I can think of better ways, but it was garbage code anyway [brute force checking that there are precisely 576 seven-digit numbers made up of 1, 2, 3, 4, 5, 6, and 7 that are also divisible by 11]. The others are just for my own curiosity.
Im trying to tackel a forever complicated process of comparing listviews
Imagine two listviews (listview1 & listview2) both have 4 colums.
On clicking a command button i want it to go through colum 3 of each row on both listviews ( one and two ) and see if they match, if they dont, do a msgbox of the text of colum 3 of that rows text in listview2.
Suppose I want to broadcast CTRL+C to my program without using complicated code (accessing Windows API) to do it.
View 3 Repliesi'm in the need to start a backgroundworker inside another one.Now...The first one BGW starts a for cycle, and inside this one there is the second BGW that has to upload an image to a server.The trouble is that, the progress event and the complete event of the internal BGW are never called.
View 11 RepliesIs there anything like STL in Visual Basic , e.g a binary tree , quick sort Do I have to implement those algorithms myself , does Microsoft provide any useful interface ?
View 1 RepliesI have a datagridview which fetches data from a local SQL server. Now, I have a setting called My.Settings.database_url which indicates the hostname of the SQL server.
Now, the problem is that if the host name is incorrect, instead of getting an error, the app just freezes. So what must I change in order to fix that?[code]...
I can grab if keypressed when form active, i mean not in sub procedures..but my form freezes when Going Delay sub.. its working.. no error but cant use any control or event of form while waiting 10 seconds.. (Form's keypreview property set to true.. )
U can use This if u want to wait applicaiton but u cant doing anything when apication in waiting period..
i think i must to check keystroke in this delay sub.. or am i call Delay sub in wrong time.. i mean i call it form activate event.. should i call it another event ?[code]...
Firstly I want to state this doesn't affect the usability of my program. I made a GUI for an old cmd line program and when running the GUI's form will freeze up and be completely unresponsive. This is annoying since you can't move the form and if you open something over the form then move/close it you get the affect in the attached pic. Attached pic is the program running and the windows calculator being moved around over it.
Is there a way I can have the form stay responsive while the program is running? I don't need for any of the buttons, text boxes, etc to be editable while the program is running.
I'm using a grid and the instructions SendKeys.Send("{end}") whenever I write a letter in a cell, so the cursor places at the end of the cell. It works when I write a letter, however when I write the symbol "/" it doesn't work, and when i get this instruction in the debugger, it freezes.
View 1 RepliesI have created a custom video player in C#. This player has two forms.
1. The Video Player window ( running in primary (UI) thread )
2. The content playing window (running in a secondary thread)
Everything goes fine for nearly 5-6 hours, then the main video player window freeze. So I cannot access any of the buttons (stop, pause ,exit) in the player. But the secondary thread keeps playing the files for even two days continuously (which is the max I tested).
Things I have checked :
1. There is no memory issue, since I dispose the objects I create after playing each file (few min videos). I have checked the process in task manager, where status is running and memory usage as same as it is started.
2. I have used Begin Invoke from secondary thread to update the current playing file in the list box on the main video player window (once the main window freeze, the update is not visible).
3. I have used a timer in the main video player window and tried refreshing form, calling Application.Do Event() for every few minutes, still it gets freeze up after 5-6 hours.
Why the UI window freeze up? Is my architecture for the player is wrong? (I need to do lots of processing in secondary thread for the images and videos to be played, but it is working fine).
I have an application which runs quite good, only once every X minutes it totally freezes, and even when running debug mode from within the VS2005 IDE, Visual studio becomes unresponsive. After pressing the pause-button to see where the app might be stuck, a messagebox saying "Unable to break execution" might pop-up after a minute or two. My app uses some timers, threads, and threadpool calls. So I'm afraid I got a deadlock somewhere, although I can not find it. Is there any way to find out where my app might hang?
Note: I synclocked every routine with a dedicated object, and for queues or arraylists, I even used the synchronized methods to modify them. I don't use recursive routines, so they cannot deadlock themselves. The strange thing (to me) is that all of my app hangs, none of the threads seems to be running, nor background, nor the GUI and even the VS environment.
i am making a program and the program runs too slow, so i would like to declare my functions at once.. not like this :
[Code]...
I've been looking for some programming languages, and I've read about the basics of Python and C++, but I'm more interested in Visual Basic But! Everywhere I look, I only find tutorials about how to use MS's Visual Basic Express and stuff, not how to code, not tutorials about the code syntax, how to declare variables and these essential things.Does anyone here has a good tip about learning the basics of VB? And not how to use VB Express/Full edition I can insert a new button but I have no idea on how to make it work, what's the point of it?
EDIT: Oh and another thing.I was playing around VB, creating a simple user interface with buttons, and I've noticed that the code doesn't change when I update the button's or other objects' Name property in the Designer window... shouldn't the code update itself with the new objects names?
i have a hashtables working with a simple dictionary, my problem is i put the stuff into the hashtables but i cant extract the key... i need the key so i can remove stuff from it using the code..
View 11 RepliesIn a function I have
Do Until PageLoaded() = True
{
Nothing
}
The problem is it freezes up the program and makes it unusable. I fixed it using timers but it makes my program real sloppy and hard to edit.
I am checking if one of the function keys is pressed in the KeyDown event of a TextBox using the following
If e.KeyCode >= Keys.F1 And e.KeyCode <= Keys.F12 Then
'do something here
End If
This works fine, except when I press F10 the cursor in the textbox freezes (ie. stops blinking) & doesn't free up until another key is pressed. Does Windows use this key for some other functionality that causes this behavior?
I have been working on a game engine for a couple of weeks now and when I finally finish and test it the windows form just freezes, I believe it to be the timer:
<System.Serializable()> Public Class Game
Public Sub New(ByVal NewGameHandle As IntPtr, Optional ByVal NewFramesPerSecond As Integer = 7)
GameHandle = NewGameHandle
GameFramesPerSecond = NewFramesPerSecond
[code].....
I'm currently working on making a database driven app without using SQL and instead using a simplistic web directory to store information.Unfortunately after just beginning I hit a rock wall on creating a login screen. As it works right now, every user has a directory and within that directory is file called "access" which has a password. While I'm aware that's it not secure, that's later to come, but right now I'd just like it to work. But the program uses WebRequest to see whether or not there is a directory under the given username, if there is then the username is considered valid and it moves on to check the password- where I start to have trouble. The password verification uses WebRequest and WebResponse as well, using StreamReader to read the access file. At the moment, the password checker only works once in a single program instance. Otherwise trying to check another login will cause the program to hang or freeze when declaring the WebResponse variable (resp).
This is the password verification code (with URL's removed):
Dim Username As String = My.Settings.usrUsername'The function is in a BackgroundWorker so I use My.Settings to communicate with the UI.
Dim Password As String
Dim usrPassword As String = My.Settings.usrPassword
[code]....
I tried using suggestions from other posts for this and still no resolution. When sending a POST request, at times it will just begin to freeze and stall. I set up my code as follows and now basically if I cannot figure out why it is freezing, then itneeds to timeout, handle the exception and restart the function.
For i As Integer = 0 To searchItems.Count - 1
If uri.Scheme = uri.UriSchemeHttps Then
Dim request As HttpWebRequest = HttpWebRequest.Create(url)
[code].....