Threads And Adding Text To A Listview?
Jun 17, 2011
I am new to VB and I am trying to add text from a thread to a listview in my Form1. I have tried implementing the invokerequired method but still the new text is not added to my listview. Please assist. (please see function addlvDataItem)This what I call in my thread class:
Private Sub DoServerListening() 'Thread to listen for new incoming socket clients Dim mSocket As System.Net.Sockets.Socket Dim newConnectionThread As clsTCPConnection Dim strRemoteIPAddress As String
[code].....
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Jun 17, 2011
I am new to VB and I am trying to add text from a thread to a listview in my Form1.I have tried implementing the invokerequired method but still the new text is not added to my listview.[code]The new text that I add is not displayed in the listview. I do not get any compile or runtime errors but still no new text to list box. I can add text from my Form1 class but not from the thread.
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May 22, 2012
i'm trying to add a string value on specific subitems but coudn't make it work.What I have right now.
With f_main.lv_main
For i = 1 To stationCount
.Items.Add( i)
[code]....
Only one line of .items.add(i) get printed on listview.
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Oct 12, 2011
For some reason I am having an issue with adding text to a listview subitem,
Try
Dim cn As New SqlConnection
cn.ConnectionString = MyConnection
Dim cmd As New SqlCommand
[code]....
I attempted a ListView1.Items(0).Subitems(dr("fDate")).Add but this gives me an error.
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Nov 3, 2011
I have a 3rd windows form opened and I have 2 textboxes to add Username and Password as well as a button that says add account. Username is named as Email2 and Password is named as Pass2 and the button is addaccount2. The forms are named Form 1 Form 2 and Form 3. I have a listview in form2 that has columns with names and im trying to get it to when you fill in the info on Form3 the username and pass and click the Add account button it will put it in the listview box but I would like it to be so username would be under the username column and password to be under password column under Form2 in the listview.
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Dec 22, 2010
Suppose I have created 70 "rule-finder" objects, and I want to run each one on data.This is a time-consuming process.The new computers with the I7 chip can run 7 processes in parallel, and so I was thinking of running 7 threads at a time. Asone thread ends, I would add another, until all 70 objects are used. When the last rule-finder has completed, I would resume the main course of the program.
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Oct 19, 2011
I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.
What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).
What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?
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Dec 30, 2009
I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
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Jun 29, 2011
I guess that I should preface this by saying that I am totally new to VB, but I come from the PHP/MySQL world so I can work my way through things syntactically. That being said, I have made a program that expedites a few things that I do on a routine basis at my place of work. However, because I have no idea what I'm really doing, my app logs up while the UI thread does all the background work.
What I am trying to accomplish, is a few things. Have multiple functions/subs [done]Somehow generate a generic method that executes a sub when called (one at a time, always)My already coded subs return values (for updating a progress bar for example) but have the background thread that spawns the function, update my UI threads progress bar / list box with the output.I guess I want to know if this is even doable, and secondarily, how would I go about doing this? I understand the idea of threading, but all of the tutorials that I have seen / read are pretty convoluted.
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Aug 15, 2011
i have created a form that has a combobox.the combobox displays the products.how can i add a selected product into a listview?
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May 22, 2012
I've created a ListView called ListView1. In the first colum, I want to add either a stop sign or a grean light.
I create the columns
HTML
ListView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left)
ListView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left)
[code]....
This seems to generate alternating stop signs and green lights in the first column. Instead, I want to be able to decide which one goes on each row on the fly, as well as change them later.
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Sep 4, 2009
Maybe someone here can shed some light. I created a Windows Mobile application with a ListView control. I want to add items to this ListView.
[Code]...
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May 2, 2012
Trying to figure out how to take a selected listviewitem and when a button is clicked add it to another listview.
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Aug 11, 2010
I have tried reading the documentation and can't find a good example of how to add rows to a 5-column unboudn listview. I manually added the 5 columns thru the designer. I'm getting an error on the highlighted line of code. See attached screenshot.
Private Sub LoadComponentGrid()
Try
Dim lvItem As New ListViewItem
[code]....
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May 14, 2010
I have a listview with 3 columns.
first - Process Name
second - Process Path
3rd / last - Process ID
I can easily get those details with mainmodule.filename and etc. But my main problem is with adding them to a listview.
I know I can do something like
Code:
ListView1.Items.Add("processname").SubItems.Add("hello")
But how to add a thirds subitem when I got a list of process in my listview. A button is click and then the listview will be added with processnames and paths. But I cant add the ID's cuz you have to give a specific listview item to add another subitem.
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Apr 11, 2011
I have a ListView on one form that i am wanting to read the items and display on a different form. My code:
Dim oList As ListViewItem
For Each oList In fSOOrderEntry.OrderList.Items
lstDetail.Items.Add(oList)
[Code]....
I don't know what this means. i want to ADD each listviewitem from one listview into another listview.
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May 4, 2012
I currently have a line of text in my listview that is too long for the current width of my
listview, without increasing the width of my listview, is there a way to add a newline within the
listview line item so that it's 2 or 3 lines long so there's no need to have the user scroll to see
the text?
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Oct 9, 2009
Most of the project I do, I use the datagridview to display the data from the database. What is the different between the datagridview and listview? If I want to display the data from the database, should I use the datagridview or the listview?
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Jan 18, 2010
I am using VB express 2008 with MsAccess as database. How to bind a dataview to a listview i.e. how we can add data to a Listview from a Dataview.
Dim
DailyExpenses As New DataTable("DailyExpenses")
Dim dv As New DataView(DailyExpenses)
I read in some post something like under but when i tried to implement that ItemsSource is not a member of Listview:
listview.ItemsSource = dtView
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Jun 2, 2011
Any snippet of code for adding groups at run-time to a listview. I am currently listing books (and stats) without groups via the following code which is executed in a loop (one pass per book title).
item = New ListViewItem
item.Text = seq.ToString
item.SubItems.Add(Mid(titlenode.Nodes(N_CSTAT).Text, 3))
item.SubItems.Add(Mid(titlenode.Nodes(N_JSTAT).Text, 3))
item.SubItems.Add(titlenode.Nodes(N_PUBLISHED).Text)
[Code] .....
The listview is set to details view. What I want to do is group the book titles by series. For example, books by Michael Connelly may be grouped by "Harry Bosch", "Jack McEvoy", "Mickey Haller", etc. I can create a new group for each new series by
groupnum += 1
group = New ListViewGroup("group" & groupnum, _
System.Windows.Forms.HorizontalAlignment.Left)
group.Name = "group" & groupnum
group.Header = series
But I cannot find how to add the group to the listview and add the new item to the associated group.
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Nov 5, 2009
I have a Callback from a socket that get called each time I get a Packet, It then add an IP address to a Listview. Now I got all the IP with the Active Connections, I cannot, From the call back check if the IP is already added to the list so I made a class and a Delegate and used UI.Invoke to call the method and check if Duplacates then add the coordinating information, I went a Step further and did a lookup on host name to pull the computer hostname from the ipaddress, But I do it each time due to getting Multiple of the same IP and I do not want to do it on the thread that the UI.INvokes from due to resolving a Host name will lock the GUI for a full Second, so you can imagine doing this on a network with constant information.
Now what I want is from the Async thread that is receiving all the data to Invoke the UI thread, check if ListviewItem already exist then exit the Dispatched Sub, then from the Async thread again check the Classes return value then if it dose not already exist start the lookup, I have this so far but Im not 100% sure if it is working the right way, Is Invoke Async or Sync even though Im telling another thread to start, if now how can I made My Async thread wait on UI.Invoke to complete 100% so I can check the classes return value?
Async Thread
Code:
MySubPtr = AddressOf MyDispatch.TreeViewItemExist 'Trigger The Event Through Form1 Backed Up Handle!
Try
'Dim DoesTheItemExist As IAsyncResult
'IAsyncResult = MainHandle.BeginInvoke(MySubPtr)
[Code] .....
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Jul 15, 2009
Public MaintenanceMenuList As ListView Function AddItems()
Dim lstModules As New ListBox()
MaintenanceMenuList.Items.Add("item_1")
lstModules.Items.Add(MaintenanceMenuList)
End Function I am receiving an error like "Object reference not set to an instance of an object". What seems to be the problem here?
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Jun 3, 2011
I can add items to a listview this way:[code]But how can I set the Tag property of that same item as the same loop? I tried going ListViewItem.Items (0).Tag = "something"..But that doesn't seem to do the trick. How do I do this?
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Jun 3, 2011
I need to be able to add items to a ListView Control and to additionally add a label as well. I have included an image to serve as a reference. This is for an application I am building for a handheld device.
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Feb 19, 2012
How do you add listview subitem by index.
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May 31, 2011
I have an MDI application, say name of MDI is MDIParent. From form1 I am adding new tab pages to form2. In the first tab of form2 I have generated a ListView by calling a ListViewCreate() function in Load event of form2. I am not able to generate ListView for the new tabs. I tried calling the ListViewCreate() while adding newtab. But, it is not creating listview nor throwing any error.
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Sep 17, 2010
So, i'd like to ask you! How can i add new listview items to a ListViewItemCollection (or something better), and than add the items in the collection to a ListView. The point of all this is to add listviewitems from a background worker.
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Nov 10, 2011
am developing a point of sale program for a project subject. The trouble im having is when i press on the button to add the item from a textbox to a listview i receive an error: See attached Screenshot.
my code is:
Private Sub SalesScreen_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.CustomerTextBox.Text = "Cash Customer"
[Code].....
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Oct 20, 2009
The following code will display items in the listview control when For Each strElementToSearch As String In fruitArray loops once using the string strTheses1 however when it loops again using the string strTR1 it will replace the items from the first loop. In another words I want to keep adding items to the ListView control. [Code]
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May 3, 2009
I have a listvew that is setup like:
[COLUMNHEADER1] [COLUMNHEADER2] [COLUMNHEADER3]
[CHECKBOX] Graham
[CHECKBOX] Greg
[CHECKBOX] David
What i was trying to do is put text in [COLUMNHEADER3] besides each of the names, so if "Graham's" details exist then put "PASSED" beside the name "Graham" and "FAILED" if it's failed, i'm not sure how to access the 3rd columns details to put that in is it:
formname.listview1.subitems("")
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