I'm trying to create a small program that will import a list of IP addresses from a text file into a list box and then run a continuous ping on each address (from the list box) and display the results in a label using backgroundworker. The idea is to have a small visual display of the status of network devices.When I try to use a list item I get cross-thread errors.[code]
View 7 Repliesi have a list box which is populated with the sub folders from a user selected folder, so the listbox item count varies from 2 item to 1000 items etc.The list box code i use to do this is:
Dim lb1s As String = Form1.Folder.SelectedPath
Dim di As New IO.DirectoryInfo(lb1s)
Dim mydirInfoArray As IO.DirectoryInfo() = di.GetDirectories
Im trying to make a feature were on a button click the app will create 1 folder for every item on the listbox (named after the list box item)So if theres 3 items on the list box for example:
001
002
band 3
[code]....
And when the user presses the button, the app will create 3 dupe folders (Only the folders, not the contents) in a user selected directory using the same names, ive been tinkering for a little while but cant seem to figure out a way to implement this.
I've been pondering upon my idea on how to create/update a text file using each item in a listbox as lines, but I fail each time. I've searched this forum as well as my friend, Google. Still nothing.
View 3 RepliesIn my application I have a listbox and SelectionMode should be MultiSimple because users need to see which items they selected. In another tab we have another listbox this one should show all the selection users had done in first tab. Private Sub
[Code]....
i have tried altering some code i have to ping an ip address and store the result in an access db.i had it working when i had the ip hardcoded in as a string but I am now gettin an error.instead of having the ip address hardcoded in to the code i want it to be read in from the access db but im now getting this error:System.nullreferenceExceptionbject reference not set to an instance of an object at...button1.click event args ei have underlined the piece of code i tried to change
Imports System.Data
Public Class Form1
Dim Ping As Net.NetworkInformation.Ping
[CODE]...
I created an application using the Ping control. So far, when "Button1" is pressed, it performs a ping test to [url]... How do I create it so that it will display a message in RichTextBox1, depending on whether or not it was successful?
View 1 RepliesI have a backgroundworker doing everything I want it to but I cannot seem to figure out how to get a listbox in the Windows Form to update from the worker. I have tried an number of things and have looked high and low, but I seem to be missing something. Is there a simple way to do this? here is a bit of my code:
[Code]...
am adding about 500k item data to a listbox using for loop, but i need the app to be responsive. AM loading the data from a textfilewhat is the bestway to do this, indicating progress with a progress bar as well?
I found and example for listview here, but that thread is old and does not seem to answer my question specifically.
Can i use the same backgroundworker for more than one operation ie after adding the items to the listbox, i need to process each data using background worker so that my app will be responsive, and it wil show progress in the progressbar, or i have to use one for each operation?
How someone would select an item from a list box and click a button and have that item go into another listbox with it's price? I seem to be stuck on this part.
Here's my code:
I want to select the first option from the first listbox and I want to put it into another listbox along with the price of that item on the same line in the listbox. I can't seem to figure out how to that.
Public Class Form1
Const dcmPRICE_STRESS As Decimal = CDec(595.0)
Const dcmPRICE_TIME_MANAGMENT As Decimal = 695
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I'm struggling with a thing or two...and i've read some stuff about the backgroundworker but im stuck Basically what i have is a : PUBLIC FUNCTION TEST (path as string) : which at the end of work , adds an item to the form1.listbox. That works quite nice but freezes the app. I've tried using the backgroundworker, the function in the background worker seems to work nicely, the bad thing is that i dont get any results in the form1.listbox.
View 14 Repliesremoving Listbox item from checked Listview item.The code I tried just errors out.
Private Sub ListView1_ItemCheck(sender As Object, e As System.Windows.Forms.ItemCheckEventArgs) Handles ListView1.ItemCheck
If (e.CurrentValue = CheckState.Unchecked) Then
ListBox1.Items.Add(Me.ListView1.Items(e.Index).Text)
ElseIf (e.CurrentValue = CheckState.Checked) Then
[Code]...
Is it possible to select an item in one listbox and then display the data of another listbox with the same indexed position? I am planning a project and this is something I would like to attempt but I haven't figured out how to do it.[code..]
I tried doing the above code but instead of displaying the listbox text the message box just returned false.
problem that i am facing is i want to add array of object as a single item in listbox. in vb6 i was using this Label1.Caption = Label1.Caption & Mid$ (strInput, intI, 1) & " " List1.AddItem (Label1.Caption) i was using label. caption to store object but not work in vs2008 because label.text only take text and left other values
View 18 RepliesI am trying to change an item in a selected item of a listbox.
View 1 RepliesI need some code that goes through each item in a listbox and executes a for next loop for each item
View 9 RepliesI have 2 listboxes on my form.Listbox 1 - populated with "available" field namesListbox 2 - populated with "selected" field names.There cannot be the same field name in both listboxes - it's either one of the other.The logic I was going to apply was to populate Listbox 1 with every field name ... and then as I populated Listbox with the field names which the user has already selected, remove the corresponding item from Listbox 1.
View 8 RepliesWorking on a project that tests up to 16 PC boards. The test routines are on a a backgroundworker thread. I want each PC board to perform the test routine on its own thread, so I would need up to 16 backgroundworkers.How do I go by doing this? Do I put 16 Backgroundworkers on the form? I tried to do it programmatically but I can't declare an array of backgroundworkers because withevents variables can't be typed as arrays. I guess I just need a kick in the right direction.
View 8 RepliesDim WithEvents backgroundWorker1 As New BackgroundWorker
[Code]....
I want to use a backgroundworker to create part of an interface. In particular i want to open a page and as soon as the page is open a new thread should start to create a stack panel with many elements inside( lets say labels) when the thread has finished to do its work this stack panel should be added open page Is this possible?
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how to add listbox item to another,when listbox r created dynamically.
View 3 RepliesJust want to ask this. I have a jQuery that move listbox item to another listbox. An its working fine the item was remove. Sample: I remove item in listbox A and it was added to listbox B. But here is now the problem, when I tried to check each item in listbox A, I noticed that all items that was removed was still there. But i can see in my eyes that it was removed. but when I tried to run a code to check each items - all item that was removed was still there.
[Code]...
I have a VB.net project which uses a background worker to do some stuff.
Now I want to expand the project to be able to do multiple stuff :)
A user can enter an URL in a textbox and when the user click on the parse button the program creates a new tabcontrol a outputs some data.
I use a hardcoded background worker for this.
But now I want to run multiple background workers to do this stuff so I can't rely on hard coding the background worker(s).
Is it possible to create background workers dynamically.
how to set this up since I think I need to set up the different methods and variables like:
Private bw As BackgroundWorker = New BackgroundWorker
bw.WorkerReportsProgress = True
bw.WorkerSupportsCancellation = True
[Code]....
I think I need to declare the background workers in some sort of array like variable (list / dictionary)??? Other then that I have no idea how to tackle this.
I'm trying to create an app with a backgroundworker to enable canceling a loop, but it won't work as I hoped it would.When I debug right after the line ThreadWorker.RunWorkerAsync() the programm goes directly to Private Sub ThreadWorker_RunWorkerCompleted and skips the Private Sub ThreadWorker_DoWork part, where of course the actual code is in (I've left that code out, it's about a 100 lines and without BGW it works).Does anyone have an idea what could be wrong with it?
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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 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.
I have a "Form" with:
1- List Box
1- TextBox
3- Button
1- OpenFileDialog
1- SaveFileDialog
I want that clicking the btn1 it shows the OpenFileDialog and read file that it has got this structure: SKI10 1 71 0 0 18 101 19 0 29 101 30 0 40 101 41 0 50 101 51 0 62 101 63 0 81 101 82 0 95 101 2 0 0 95 165 3 0 1072 01 4 2 1 93 15
I want that it reads all Line of the File and it add an Item in ListBox for line.For example the first Item of the ListBox in this case is
SKI1
And the 2th Item is in this case.
0 1 7
I want using the StreamReader classes.And i want that when i click an Item of the ListBox it shows the Text in the TextBox and I can edit the Line and that clicking antoher button the Item will come updated with new Text of the TextBox.I have also another button for saving the Mod.I can use the AppendText and it create a new file writing ListBox1.Items line for line.
If SaveFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then Dim file_esistenteD As StreamWriter[code].....
I have a multiple form application with a listbox on each form. I want to be able to select an item in one listbox on one form and then click a button and it show up in a listbox on another form.
View 3 RepliesI have a listbox that I can load items into.
How can I click a button where it will highlight the next item and paste it into a textbox?
Me.ListBox1.SelectedIndex = Me.ListBox1.SelectedIndex + 1
For n = 0 To UBound(openfiledialog.FileNames)
listbox.Items.Add(openfiledialog.FileNames(n))
listbox.SelectedIndex = openfiledialog.SelectedIndex + 1
Next n
my problem is that i cant add another file to my listbox, i tried to put the line listbox.SelectedIndex = openfiledialog.SelectedIndex + 1, but still it wont add another file.
I Need Some Help How Ican Go to the Last Item In Listbox
View 1 RepliesI'm trying to be able to get a tag from a listbox item, but I can't find a listbox class. All I can find is the listviewitem class. Here is my code so far:
Class Form3
dim item as new listviewitem
Private Sub AddItem() Handles Button1.click
[Code].....
The only problem is that there is no tag property in listbox1.selecteditem.