overriding ListView's Paint event - Visual Basic Discussion Boards

I have a database in Access and a table is there whose values may change run time.One data report is there to show the report from this table. But datareport is not getting refreshed while changing the values of table. Any solution..?

overriding ListView's Paint event

grambowk23-Aug-05 21:48

grambowk

23-Aug-05 21:48

I've been trying to override the ListView's Paint event as I need to handle this event in my Windows Forms Project.

I've managed to get the Paint event to fire (as desired) but any items that I add to the ListView are not visible. I am completely clueless when it comes to custom draw controls but I suspect that as I'm overriding the paint event I'm going to need to draw the items I add.

Can anyone point me in the right direction in terms of what I need to do to be able to see the ListViewItems that I add to my custom ListView?

Here's the code that I'm using to expose the paint event.

Thanks,

Karl

<br />
Imports System<br />
Imports System.Drawing<br />
<br />
Public Class MyCustomListView<br />
    Inherits ListView<br />
<br />
    Public Sub New()<br />
<br />
        Me.SetStyle(ControlStyles.UserPaint, True)<br />
        Me.SetStyle(ControlStyles.DoubleBuffer, True)<br />
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)<br />
<br />
    End Sub 'New<br />
<br />
    Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)<br />
<br />
        MyBase.OnPaint(e)<br />
<br />
    End Sub 'OnPaint<br />
<br />
End Class 'MyCustomListView<br />

Re: overriding ListView's Paint event

Dave Kreskowiak24-Aug-05 5:33

Dave Kreskowiak

24-Aug-05 5:33

Are you saying that your trying to add items to the ListView inside the Paint event? (Not a good idea BTW!)

Or if your just trying to custom paint the thing, search the artciels for "custom listview" and you'll come up with a few examples. They might have what you're looking for.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: overriding ListView's Paint event

grambowk24-Aug-05 8:15

grambowk

24-Aug-05 8:15

Dave Kreskowiak wrote:
Are you saying that your trying to add items to the ListView inside the Paint event? (Not a good idea BTW!)

I'm not trying to add items inside the Paint event. I'd like to get away from that as much as possible. I don't even want to custom paint the thing (if I can get away with that).

All I wanted to do was to expose the ListView's Paint event but ever since I did that (using the code shown in my initial thread) any items that I add to the listview don't show up.

If I comment out the line below, any items I add show up, but then of course the Paint event is not exposed anymore:

<br />
Me.SetStyle(ControlStyles.UserPaint, True)<br />

asp page

ybasha23-Aug-05 17:00

ybasha

23-Aug-05 17:00

hi there,

i have a asp page which display record from the database in my database there are 8 record i sorted the record and display only last 3 record but my srno is same as in database that " 3,4,5" i want my srno to display as "1,2,3" can any body help me
this is code
<%=(1)%>
"><%=rst("fileName")%> <%=rst("reportMonth")%> <%=rst("reportYear")%> <%=rst("status")%>regard
ybasha

Re: asp page

Rizwan Bashir24-Aug-05 2:08

Rizwan Bashir

24-Aug-05 2:08

check rst.recordcount plus where is the while loop for your code

while not rst.eof
<td><%=(1)%></td>
<td><%=rst("fileName")%></td>
<td><%=rst("reportMonth")%></td>
<td><%=rst("reportYear")%></td>
<td><%=rst("status")%></td>
rst.movenext

wend

Vb.Net Small Project

VBUser7723-Aug-05 14:55

VBUser77

23-Aug-05 14:55

Hi I am learning VB.Net. Right now my knowledge is all in bits and pieces I want to put all this together so I want ot create a small project that covers all the features of vb.net. Do any of you have guidelines to any such project for a vb.net beginner.

Thanks

Re: Vb.Net Small Project

rwestgraham23-Aug-05 15:28

rwestgraham

23-Aug-05 15:28

A good beginner level project is an address book.

Use a treeview/listview design. Treeview has a top node for each alphabet letter, and names under each letter. List view shows details when you click on a name. Adda menu and a toolbar. Create forms to allow you to add/edit data. Use a small Access database as the data source. Make sure it is normalized. If you don't know what that means, time to learn. Smile | :)

This is a good beginner level exercise that uses a variety of controls and their events, requires field level validation, data binding, data access, and sharing data between forms.

Plus you can actually use it when you are done. Smile | :)

Application Login Suggestions?

DEWright_CA23-Aug-05 12:58

DEWright_CA

23-Aug-05 12:58

Ok, I am planning out right now a new VB.Net application and am looking for suggestions.

I will be storing the username & passwords inside a SQL table and need suggestions or pointers for code to handle the read/write and decription for verification of the passwords.

This is a system being developed for the Federal Government so a serious level of security is required for this app.

I have been looking through the Microsoft Enterprise Patterns & Practices but am not sure if this is the way to go.

Suggestions?? or Ideas??

David @ Premier

You are only as good as your last project.

Re: Application Login Suggestions?

Rizwan Bashir24-Aug-05 2:14

Rizwan Bashir

24-Aug-05 2:14

use number system for security like in linux. and encryption algos for username and password provided in dotnet like check this
http://www.google.com.pk/search?hl=en&q=encryption+vb.net&meta=[^]

Obfuscation..of windows based vb.net app. causes the Crystal reports to error out?

tciinc123-Aug-05 10:52

tciinc1

23-Aug-05 10:52

Hi All. I have 2 windows application build with Visual Studio Enterprise Architect.
1st one is the actual application and the 2nd one is the installation project.

1st application utilizes 2 crystal 10 reports build with CR10 that comes with the studio.
Then I obfuscate this project and place the exe in 2nd - installation project. After installation everything
works except the crystal reports. I get an error stating: "can not find the report in the manifest file.
Please recompile and try again"

BUT if I recompile WITHOUT obfuscating the project and install it everything works!!!

ANY IDEAS??? What is wrong??

debug from web service

liquid_23-Aug-05 10:45

liquid_

23-Aug-05 10:45

I'm (beginner) programming a web service with win application, both in VB.NET (VStudio.NET 2003). How can I send messages from Debug class used in web service to output (debug) window in VS? Messages from application side appear in this window.

Unhandled Exception - please help!

dotolee23-Aug-05 9:13

dotolee

23-Aug-05 9:13

I'm getting an error when I try to call my function getPMOhistory().
The error is:

An unhandled exception of type 'System.InvalidOperationException' occurred in system.data.dll

Additional information: ExecuteReader: Connection property has not been initialized. I've bolded the line that is causing the problem.
I've created a class that handles all my data requests and it looks like this:

Imports System.Data
Imports System.Data.OleDb

Public Class DataBroker
Dim gConn As OleDb.OleDbConnection
Dim gDataReader As OleDb.OleDbDataReader
Dim gobjDBCommand As OleDbCommand
Dim goData As OleDbDataReader
Dim gstrSQL As String
Dim gstrPETConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=H:\PET\Data\pet.mdb;User Id=;Password=;"
Dim gstrPMOConnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=H:\PET\Data\sr.mdb;User Id=;Password=;"
Const PET As String = "PET"
Const PMO As String = "PMO"
Dim gstrError As String = Nothing
Public Function GetProjectTypes() As DataSet
'If Connect(PET) Then
'gstrSQL = "Select *"
'End If
End Function

Private Function Connect(ByVal strDB As String) As Boolean
If strDB = PET Then
gConn = New OleDbConnection(gstrPETConnString)
Else
gConn = New OleDbConnection(gstrPMOConnString)
End If
Try
gConn.Open()
Connect = True
Catch
Me.ErrorMessage = Err.Number & " " & Err.Description
Connect = False
End Try

End Function
Private Function DisConnect(ByVal strDB As String) As Boolean
gConn.Close()
End Function

Public Function GetPMOHistory() As Boolean
gstrSQL = "SELECT * FROM QUERY1"
gobjDBCommand = New OleDbCommand(gstrSQL, gConn)
If Connect(PMO) Then
QueryResults = gobjDBCommand.ExecuteReader()
Else
Me.ErrorMessage = "Unable to connect to database. Please try again later"
End If
End Function
Public Property ErrorMessage() As String
Get
ErrorMessage = gstrError
End Get
Set(ByVal Value As String)
gstrError = Value
End Set
End Property
Public Property QueryResults() As OleDbDataReader
Get
QueryResults = goData
End Get
Set(ByVal Value As OleDbDataReader)
goData = Value
End Set
End Property

Public Sub New()

End Sub
End Class

Re: Unhandled Exception - please help!

Steve Pullan23-Aug-05 14:01

Steve Pullan

23-Aug-05 14:01

Try moving the gobjDBCommand = New OleDbCommand(gstrSQL, gConn) line into the body of the IF statement like this...

Public Function GetPMOHistory() As Boolean
    gstrSQL = "SELECT * FROM QUERY1"
'    gobjDBCommand = New OleDbCommand(gstrSQL, gConn)  ' FROM HERE
    If Connect(PMO) Then
        gobjDBCommand = New OleDbCommand(gstrSQL, gConn)  ' TO HERE
        QueryResults = gobjDBCommand.ExecuteReader()
    Else
        Me.ErrorMessage = "Unable to connect to database. Please try again later"
    End If
End Function

The variable gConn is not initialized until after function Connect() is called so the instantiation of gobjDBCommand is not valid until this time.

...Steve

Re: Unhandled Exception - please help!

dotolee24-Aug-05 2:57

dotolee

24-Aug-05 2:57

Thanks steve.
A while after I posted... I figured it out!
Thanks!

Conversion of vb6 to .net web form

KevinSDavis23-Aug-05 7:18

KevinSDavis

23-Aug-05 7:18

I am currently trying to convert a vb6 client server program to a .net web form using vb.net.

The client server vb6 program uses the webbrowser object to open a browser window and then post some data to it using the following code.

webBrowser.Navigate2 URL, 0, "BrowserWindow", "", ""

it then posts data to it using

Screen.MousePointer = vbHourglass

'Write the byte-array into a variant
varPostData = bytpostdata

'Create the Header
strHeader = "Content-Type: application/x-www-form-urlencoded" + Chr(10) + Chr(13)

'Post the data
webBrowser.Navigate2 URL, 0, "BrowserWindow", varPostData, strHeader

Can someone give me the equivalent code to be used in a .net web form, I do not mind wether it is server side code or javascript?

Any help will be appreciated?

new table won't appear in Config Wizard

DaveC42691323-Aug-05 6:32

DaveC426913

23-Aug-05 6:32

Doing a simple book exercise - SQL Connections 101 stuff. I got my data showing up and everything was going fine, then I realized I'd forgotten a table. I went back and added it to the database.

Try as I might, I can't get that table to appear in VisStudio/VB.NET's Data Adapter Configuration Wizard (Query Builder: Add Table). All the others do, but not that one. It's got permissions, it's even got relationships. I've even started from scratch, doing everything again in a new project. That table will not show up in the list with the others. What gives?

Have I forgotten to set some property of that table that I did with the others? Does the connection have some sort of cached record of the database tables that I should purge?

________________________________________________________________________
Dave
Y10K bug! Let's not get caught with our pants down **AGAIN**! (DC 02002)

MouseHover Event

directred23-Aug-05 5:37

directred

23-Aug-05 5:37

How does this work?

I want to have a description of the field that the mouse hovers over.

Example could be, when the mouse hovers over a text box, want a description to say something rather than a message box appearing or a description in the status bar.

Re: MouseHover Event

oakleaf23-Aug-05 5:42

oakleaf

23-Aug-05 5:42

Have you tried the tooltip control?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.