VS 2005 Run A Function In The Background?
May 17, 2010
I have a datagrid with a list of items. Each item has an url for a picture. For each item I have to download the picture from the url, and then show it in the grid. This takes quite a long time, and freezes my application while running.
Is it possible to do this in the background, while allowing the user to take other actions? For example, scrolling down the list to see the items that have been loaded. Or clicking on an item in the list, which calls another function. Maybe doing something on a different form. And doing this while the list continues to load in the background.
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Oct 23, 2011
I am developing app in VB.NET that should have HTML requests and getting responses as string. Now I am using this code:
[Code]...
But when I run this code, my program froze for a little bit, until this URL content is loaded. I searched over google and I didn't find anything about this. I tried using Classes and Modules, but with both of those it's frizzing again. Can someone explain me how to run this in background, so program won't froze, and when it get's downloaded to return data?
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Mar 17, 2011
How do I let the function in a form run in the background without slowing down/stopping my entire application until it has finished?
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Jun 6, 2010
I 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.
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Nov 17, 2009
If I use NotifyIcon in my project, will my socket that updates my app still function in the background?
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Oct 4, 2010
What is the Invoke syntax to marshall data from a background thread receive callback method to a function on the UI Thread?(Form1).
Public Class Form1
MyDelegate = New DisplayData(AddressOf DisplayData)
Private Sub Form1_Load()
MyDelegate = New DisplayData(AddressOf DisplayData)
[code]....
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Mar 1, 2012
What I have done is named a bunch of picture boxes "Q," "W," "E," etc. (the whole alphabet) and named picture that correspond to these picture boxes ("Q.png," "W.png," and so on) and added them to my resources.
For example, the following code would give the picture box named "Q" it's corresponding image "Q.png":
vb
Q.BackgroundImage = My.Resources.Q
Of course, it's kind of a pain in the backside to copy and paste this code and change all the Q's to W's and so on, so I was hoping to create a function to do the job for me:
vb
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'So that I can run the letter as a string through the function,
[Code].....
Hopefully I've provided enough detail so that it is obvious what I'm trying to do.
Obviously, the code I tried above (the second block) doesn't work - it gives a syntax error. I need to change/write to make this function functional.
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May 20, 2009
How do I dynamically call a function with delegates by passing a string to a background thread in VB.NET?
Currently my code is this
Public Sub invertImageBK(ByVal image As Bitmap)
Dim snxl As System.ComponentModel.BackgroundWorker = createBW()
snxl.RunWorkerAsync(New ImageProperties(image.Clone, "invertImage", Nothing))
[Code].....
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May 13, 2009
there is 1 problem that i keep trying to sort out but cant quite do it, this is in a form is there a way to make the background to it transparent? thus see all the pictureboxes, buttons, labels,etc. inside the form but not the form itself? the only things i can think of is opacity and visible however those just don't show anything in the form at all. if I try change the backcolor to transparent it ends up with an error as to what i can understand(correct me if i'm wrong) only controls and childs can have transparent backgrounds.
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Dec 22, 2009
with a triangle formed object and the rest of the image(background) are transparent... how do i make the transparent area not click able?my code how it is now>
Private Sub PictureBox2_MouseDown1(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox2.MouseDown
'code for picturebox not start an click event. only if the image will be clicked>>
[code]....
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Jun 3, 2009
I have been tryin to get this code to pan a forms background image.
im nNewSize As Image = Me.BackgroundImage
Private blnMoving = False
Private x As Long
[code].....
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Aug 11, 2011
I've been trying to figure out what is going on with this code, but it looks like I need some help. The issues I'm having is when I click a button that executes my background worker, it freezes and the UI comes back once the listview control is populated.My guess is that some part of my code under the backgroundworker_dowork function is trying to update something on the UI thread causing it to freeze. I just can't figure out what is trying to call the UI.
The user is supposed to click a add server button and enter the server name. The server name will be added to the ListView control. When they click refresh, the background worker is executed which attempts to get the DNS name, IP Addresses, and online/offline status.
Obviously, I'd like to run this code without freezing the UI. Does anyone have any idea on why this might be happening? My guess is because the ListViewItems are passed to the background worker and still have a reference to the control running on the UI thread. Am I right with this statement? If so, how do I change my code to get rid of that reference?
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Nov 11, 2009
I have a problem when i opened a picture that
size image < size picture box
How can make the background of the picture box become an image too because my coding was to get the pixel from width and height picture box.. When I found the none image property, vb will show the error.. said coordinate(x,y) was null. It can be illustrated like on the picture above.
Sometimes I will used it when:
picture properties - size mode = center image
So the picture will found at center height and width.. and the background will surround it. Sometimes I used it after rotating the picture.. The problem occur when the picture get rotate for 45 degree. I am taking all point corners of the image and rotating it. So the picture will create 4 triangle at the corners..
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Apr 17, 2010
I have a button which on click will save the data into the database and after successful entry of data a messagebox will be displayed.Now,all i want to do is I want to calculate the time of how long does it take between clicking the button and displaying the messagebox.
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Jun 8, 2009
I am trying to resize a form1's background image and make its "BackgroundImageLayout = ImageLayout.Center" from form2 but it keeps disappearing of the screen as it resizes.
Private Sub btnResize_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnResize.Click
Dim nNewWidth As Double = 0
nNewWidth = Double.Parse(Me.Label5.Text) / 100
[code]....
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Jul 27, 2011
I have a treeview and if I click on another control the hightlight disappears so I set the HideSelection to false and now the highlight row changes to a really light gray. Is there a way to have it still as dark blue. The reason being is because the user is clicking on a row in a grid and dropping it on the treeview and I need it to be clear that it will add it to the selected node which needs to be clear.
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Jul 31, 2010
I have Ln in my function that I write in excel but in vb it doesn't work
0.215*Ln(4.32/0.3)
it should return the value = 0.573
how can I write this function without using log function (I don't know logs functions)
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Sep 5, 2009
I am trying to figure out how to print a string of text inverted so the background would be black, and the text would be white. Is there any way to do this using drawstring? Been looking around, but am not getting anywhere.
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May 6, 2009
I'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.
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Dec 4, 2008
A non-UI thread in my prog needs to obtain data from a UI listview control. To prevent cross-thread errors I use the following, but it freezes the prog (probably because the "Else" part is never called).What am I doing wrong?
[Code]...
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Jun 28, 2010
Is this a good way of getting out of a function?
If f1.AppendLine(strTextMsg, strText) = True Then
Return True
Exit Function
Else
Return False
Exit Function
End If
This is in code that I'm taking over and finishing and I'm just wondering if I should be skeptical of this logic. The programmer seemed to overly-use "Exit Function" (like right before an exception handler would be called as if he thought if he didn't have it he'd fall right through into the exception handler even when there was no exception).
Personally, I would've just coded: Return(f1.AppendLine(strTextMsg, strText))
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Feb 18, 2011
Background of form: black
background of char, bombs and shrooms: transparent
picbox behind char, bombs and shrooms is regular (marioland)
How can i fix it so the transparent parts dont see form as background but marioland as background?
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Jan 24, 2012
I want to know how's the function KeyPress, on VB 2005, when it comes to the Help Buttons (F1, F2, F3)
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Jun 7, 2009
using the string function in VB 2005:1-When do we use string fucntion with paranthesis and without paranthesis ex:
Me._aldata = New ArrayList
Public Property getitem(ByVal intindex As Integer) As String
Get
[code]....
I'd like to know do i have to put paranthesis at all times?
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Dec 22, 2011
I'm working on an updater for my applications. I'm using VB .NET 2005. So, when I push the button called "Download" it runs twice and does the following: Download the file (~20mb). When the file is downloaded then it does again the same overwriting the first file. I used the following to make the download possible:
[Code]...
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Oct 3, 2009
Function test(ByVal res As Integer) As Integer
res = 2
Return res
[code].....
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Nov 24, 2010
I have few columns in a datagridview,out of which one is of type Button and another is of TextBox(which is hidden). When the user clicks on the button in the column , i want to execute the function whose name is written in the corresponding column.
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Oct 27, 2009
I am using the following
Public Function EncryptString128Bit(ByVal vstrTextToBeEncrypted As String, _ByVal vstrEncryptionKey As String) As String
Dim bytValue() As Byte = Encoding.ASCII.GetBytes(vstrTextToBeEncrypted.ToCharArray)
[code].....
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May 3, 2012
I 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].....
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Jul 19, 2009
I want to enter a "Some text" at the background of the form that i will print...its like the "waterpaper" of the microsoft words...
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