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hi all,
in my application i create multiple panel during run time . These panel also contains some other control .Base on number of records return by database query , panels is created (up to 1000).During execution i face "Error creating window handle." multiple time . i search on net, for resolve this problem but no proper solution is found.
anybody have idea that how can resolve this problem ?
Rupesh Kumar Swami
Software Engineer,
Integrated Solution,
Bikaner (India)
My Company
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You're creating over 2,000 controls on a form??? I hope you like waiting for the form to paint.
This is a REALLY bad idea. I suggest you limit that to a few hundered controls.
Part of the problem you're running into is that you're create so many windows. The Handle pool is probably being exhausted, explaining the error you're getting. If you don't properly dispose and release these resources, you'll cause this problem. BTW, the Handle pool isn't specific to your app. It's a system-wide pool. So, if you run the pool dry, the entire system will start doing strange things.
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Hi!
I have place a splitcontainer on the form vertically. So the panels in the container called Panel1 and Panel2. I have also placed a tabcontrol inside the panel 2 and a groupbox in panel1. When I click a tabpage in tabcontrol I want to disable Panel1. However It doesn't do anything. Why?
Thanks
<br />
Private Sub TabLayout_TabIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TabLayout.TabIndexChanged<br />
<br />
'This message never shows up. This control resides in Panel2<br />
MsgBox("Here")<br />
End Sub<br />
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Hi All
I am using a WebBrowser control to navigate to sites in my VB.Net application. After navigating I want to Navigate to some of the links in it depending on some conditions. Can anybody advise how can I collect the links contained in the WebBrowser Document and how can I Raise a click event for a collected link so that it automatically navigates to the link.
I have written the code as bellow :
Dim link1 As mshtml.HTMLLinkElement
link1 = WebBrowser1.Document.Links(10)
Now How can I click the link link1 to navigate to the link.
Please Help. Thanks in advance.
Sekhar 
modified on Monday, February 11, 2008 6:42 AM
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Hi!
I have a listview box within 2 columns. When I populate and sort the listviewbox with ListviewItemComparer, I don't get any error but when I do it second time inside from another procedure ,I have received invalid index of 1 message in ListviewItemComparer class file. In second time When I apply an index of 0 for the column to sort, I don't get any error message but when I define 2nd column in listview box, I get error.
Any help will be appreciated!
Thanks.
Juneyt.
<br />
Private Sub Form2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load<br />
Call LoadTags()<br />
End Sub<br />
<br />
<br />
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click<br />
<br />
'I reload it when any new entry takes a place in database<br />
<br />
Call LoadTags()<br />
<br />
End Sub<br />
<br />
Private Sub LoadTags()<br />
<br />
Dim mySelectQuery As String = "SELECT * FROM Tags"<br />
Dim myconnection As New OleDbConnection(SQLConnStr)<br />
Dim myCommand As New OleDbCommand(mySelectQuery, myconnection)<br />
<br />
myconnection.Open()<br />
<br />
Dim myReader As OleDbDataReader = myCommand.ExecuteReader<br />
<br />
If myReader.HasRows = False Then<br />
myReader.Close()<br />
myconnection.Close()<br />
Exit Sub<br />
End If<br />
<br />
ListView1.Items.Clear()<br />
<br />
While myReader.Read<br />
<br />
ListView1.Items.Add(myReader.GetValue(0).ToString)<br />
Dim TACC As Int32 = ListView1.Items.Count - 1<br />
<br />
ListView1.Items(TACC).SubItems.Add(Trim(myReader.GetValue(1).ToString))<br />
<br />
End While<br />
<br />
myReader.Close()<br />
myconnection.Close()<br />
<br />
<br />
If ListView1.Items.Count > 1 Then<br />
'The error occurs here!<br />
ListView1.ListViewItemSorter = New ListViewItemComparer(1)<br />
ListView1.Sort()<br />
End If<br />
<br />
<br />
Public Class ListViewItemComparer<br />
Implements IComparer<br />
Private col As Integer<br />
<br />
Public Sub New()<br />
col = 0<br />
End Sub<br />
<br />
Public Sub New(ByVal column As Integer)<br />
col = column<br />
End Sub<br />
<br />
Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer _<br />
Implements System.Collections.IComparer.Compare<br />
Dim returnVal As Integer = -1<br />
returnVal = [String].Compare(CType(x, _<br />
ListViewItem).SubItems(col).Text, _<br />
CType(y, ListViewItem).SubItems(col).Text)<br />
Return returnVal<br />
End Function<br />
<br />
<br />
End Class<br />
What a curious mind needs to discover knowledge is noting else than a pin-hole.
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Well, the first problem I see is that your code is making an assumption it shouldn't be making:
While myReader.Read
ListView1.Items.Add(myReader.GetValue(0).ToString)
Dim TACC As Int32 = ListView1.Items.Count - 1
ListView1.Items(TACC).SubItems.Add(Trim(myReader.GetValue(1).ToString))
End While
This code is adding a new item to the list view, but then using an index to add items to that item, which MAY NOT point to the same item! Rewrite the code to create and use a ListViewItem object, modify it with subitems, then add it to the ListView:
While myReader.Read
Dim newItem As New ListViewItem(myReader.GetValue(0).ToString)
newItem.SubItems.Add(Trim(myReader.GetValue(1).ToString))
ListView1.Items.Add(newItem)
...
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Hello every one
How ca I select a item in a combobox when I know which index to be selected?
Regards
Nishkarsh
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cbx.SelectedIndex=knownIndex
Regards,
Thomas Stockwell
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Visit my homepage Oracle Studios[ ^]
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hi guys
i am using 3-tier architecture in my application,
now problem is with my reporting as i am not using datasets,i am using custom domain objects.
now my reports need dataset in order to show data on reports but i just want to use
custome objects not data sets , is there any alternate or better solution ,, thanks in advance
hello
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What you do depends on the reporting solution you're using. If all it will take is a DataSet object, your kind of pigeon-holed into what you can use. If it takes objects deriving from some other root class or must implement some interface, then you've got options.
But, a quick workaround would be to add code to your class that takes the data in the object and creates a DataSet or DataTable object from it and returns that to the caller.
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i wan to invoke a ppt in a system connected in lan from the server at a particular time.can u plz help me?
d
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You can use a time or a background process or can just have a pooling and time comparison and then fire a function by which u open other applications
Use the path as
\\<ip>\<shared folder=""> \ File
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Are you asking how to launch a PowerPoint presentation on one machine from code running on another??
Sorry, you can't do that. Launching an interactive process remotely is expressly forbidden because of security risks.
You can, however, have an application running on the client machine that will accept a command from another app running on the server side. The command would tell the client app to launch the presentation, locally to the client of course.
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Sorry for the double post, Please help!
I cannot Access HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion (64-bit)
because of registry virutalization of x64...
How can access this using Vb.NET?
My.Computer.Registry.SetValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion", "RegisteredOwner", TxtOwner.Text)
It will be redirected to Wow6432... Any ideas? Please post the code...
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any help? 
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Sorry, I was too busy having a life to answer over the weekend.
What's the exception message you're getting??
Please keep in mind that this in no way guarantee's an answer. I've never had the opportinuity to play around with 64-bit Windows.
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there is no exception...how can I disable and enable registry redirection
of x64? because it automatically re-direct to another path "Wow6432"
instead of the path above.
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Hello everyone and thanks for looking, my group and I have been working on a project at school for our senior project and we have run into a little snag.
We have a program in VB.net designed to connect using USB communication to a development board to interface with a microcontroller, the program is successful and we have only one last problem to solve.
When the program first starts up we would like it to automatically run a command within the program, specifically this button:
Private Sub cmdConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdConnect.Click
OpenMPUSBDevice()
If myOutPipe <> INVALID_HANDLE_VALUE Then
Timer1.Enabled = True
End If
End Sub
Basically what we would like to happen is that once the program is first run this button "auto-clicks" itself to automatically connect through USB to our development board then could be used later for reconnect if possible. We tried to encapsulate it into a simple while loop but the button needs to be clicked prior to entering.
I tried implementing something like this:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cmdConnect.PerformClick()
End Sub
But ended up receiving this error:
------------------------------------------------------------------------
Microsoft Development Environment
An unhandled exception of type 'System.Security.SecurityException' occured in USBAuto.exe
Additional information: System.Security.Permissions.SecurityPermission
------------------------------------------------------------------------
Where in the program the command: OpenMPUSBDevice() was highlighted
I’m sorry if I’m asking a really easy/hard question as programming is not my specialty, hardware person myself, any help would be greatly appreciated,
-Prower
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Try
Call cmdConnect_Click(cmdConnect, New System.EventArgs())
On form load...It will eork
Good Luck
Nishkarsh
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Thank you so much I just assembled the program and it seems to be working
Can I make use of this command on a check box as well? And just alter the syntax to that of a check box?
Such as:
Call cbIO1High_CheckedChanged(cbIO1High, New System.EventArgs)
So that on load the check box is high the use a delay for say a second then un-check the box? And I know I can just go under properties and just set it to be checked I am just wondering if it is possible for a checked box to be un-checked on start up then checked for a second or so then set back to un-checked
Thanks again
-Prower
modified on Saturday, February 9, 2008 6:54 PM
<div class="ForumMod">modified on Saturday, February 9, 2008 6:59 PM</div>
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Better yet, refactor out the code in this Click handler to its own method. Then you can call it from both the Click handler and your other startup code without bothering with PerformClick.
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hello everyone,
i have a problem i wish you could help me with it...
how can i make the datagrid become a data entry? and how to make a " Save button " for it?
i hope you could help me because this is the only problem i currently face in my new software...
thx very much....
ok that's cool
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The documentation[^] explains how to use the DataGrid control for CRUD operations. I suggest you read it and only post again if you have more specific questions.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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hi Paul is Right and buying a book will be another good idea.
check this it might help you
http://www.codeproject.com/KB/vb/N-Tier_Application_VB.aspx[^]
Hope it helps
Vuyiswa Maseko,
Sorrow is Better than Laughter, it may Sadden your Face, but It sharpens your Understanding
VB.NET/SQL7/2000/2005
http://vuyiswamb.007ihost.com
http://Ecadre.007ihost.com
vuyiswam@tshwane.gov.za
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I need my vb application to act on a non windows application by activating it and sending mouseclicks to it and also doing optical character recognition on it at the same time.
Anyone know where to look to do this?
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