Visual Basic Discussion Boards

paul@gtns.net31-Jul-04 1:42

31-Jul-04 1:42

Probably dead easy but new to this and just cant work it out.

I want my combobox to display the data from a particular column in an access database. Can somebody please explain how in nice easy steps.

I have a connection in the server explorer and can drag the field from their to the form to get the connection and dataadapter objects and have created the data set (data, generate..) but cant get the combo to display the info from the db.

Paul

Re: Displaying Data from Access

Mekong River1-Aug-04 4:18

Mekong River

1-Aug-04 4:18

I just give you some idea relate to your idea.
1. Connect to your database and write and SQL statement to select all the information from database. Move to last and go to first record (populate the recordset).
2. In the DropDown event of the combobox try to loop one by one record and add it item to the combobox.
Note: before the dropt down list appear clear all the information in the previous list.

Roath Kanel
APO-CEDC
Save Children Norway-Cambodia Office

Multiple Inheritance

Ravi S.V.30-Jul-04 22:17

Ravi S.V.

30-Jul-04 22:17

Does VB.Net support Multiple Inheritance?

Re: Multiple Inheritance

Colin Angus Mackay31-Jul-04 3:24

Colin Angus Mackay

31-Jul-04 3:24

No. But, you can multiply inherit interfaces.

"If a man empties his purse into his head, no man can take it away from him, for an investment in knowledge pays the best interest." -- Joseph E. O'Donnell

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

create data dictionary

Britnt730-Jul-04 9:33

Britnt7

30-Jul-04 9:33

How do I add this to my code to use AdsDDCreate? D'Oh! | :doh:

Or do I need too?

UNSIGNED32 AdsDDCreate( UNSIGNED8 *pucDictionaryPath,
   UNSIGNED16 usEncrypt,
   UNSIGNED8 *pucDescription,
   ADSHANDLE *phAdminConn );

I am trying to create a data dictionary using an Advantage Client Engine in VB.net with ASP.net.

Then I am going to use

AdsDDCreate( "n:\\MyData\\myData.ADD", 0, "Database describtion", &hDD );

Thanks

Beginner in VB.Net and ASP.Net

Not sure what happened below

partt30-Jul-04 9:22

partt

30-Jul-04 9:22

<asp:datagrid id="dgCons" runat="server" Height="196px" Width="259px" Font-Size="10pt" BackColor="White" BorderWidth="1px" BorderStyle="None" CellPadding="4" BorderColor="#3366CC">

<SelectedItemStyle Font-Bold="True" ForeColor="#CCFF99" BackColor="#009999">
</SelectedItemStyle>
<ItemStyle ForeColor="#003399" BackColor="White"></ItemStyle>
<HeaderStyle Font-Size="Smaller" Font-Bold="True" ForeColor="Navy" BackColor="InactiveCaptionText">
</HeaderStyle>
<FooterStyle ForeColor="#003399" BackColor="#99CCCC">
</FooterStyle>
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<asp:CheckBox id="chkUse" runat="server">
</asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
<PagerStyle BorderWidth="1px" BorderColor="White" HorizontalAlign="Left" ForeColor="#003399" BackColor="#99CCCC" Mode="NumericPages">
</PagerStyle>
</asp:datagrid>

Re: Not sure what happened below

Colin Angus Mackay31-Jul-04 3:25

Colin Angus Mackay

31-Jul-04 3:25

It would help if you explained what happened, and what was supposed to happen.

Re: Not sure what happened below

Anonymous2-Aug-04 3:50

Anonymous

2-Aug-04 3:50

Sorry, I was meaning to cancel this one out. It was reffering to the thread below. It's taken care of now. Thanks.

Checkbox in Datagrid

partt30-Jul-04 9:18

partt

30-Jul-04 9:18

Below is the code for my datagrid. I am using Sql Server 2000. How can I have checkbox.checked = true in the grid when I load it based on the data sent from the database?
Thanks for any help.

<asp:datagrid id="dgCons" runat="server" height="196px" width="259px" font-size="10pt" backcolor="White" borderwidth="1px" borderstyle="None" cellpadding="4" bordercolor="#3366CC">
<selecteditemstyle font-bold="True" forecolor="#CCFF99" backcolor="#009999">
<itemstyle forecolor="#003399" backcolor="White">
<headerstyle font-size="Smaller" font-bold="True" forecolor="Navy" backcolor="InactiveCaptionText">
<footerstyle forecolor="#003399" backcolor="#99CCCC">
<columns>
<asp:templatecolumn>
<itemtemplate>
<asp:checkbox id="chkUse" runat="server">

<pagerstyle borderwidth="1px" bordercolor="White" horizontalalign="Left" forecolor="#003399" backcolor="#99CCCC" mode="NumericPages">

************************************************************************

Dim PKConsU As DataTable = DirectCast(Session("GetCons"), DataTable)
Dim sl As New PK.BusinessLogicLayer.CAccessories()
sl.CMCode = Request.QueryString("CMCode")
PKConsU = New DataTable()
PKConsU = sl.ConsumerU(Session("CurrentTesterID"))
Session("GetCons") = PKConsU

dgCons.DataSource = PKConsU
dgCons.DataKeyField = "GeneralDescription"
dgCons.DataBind()

Vector

fo0lish30-Jul-04 8:33

fo0lish

30-Jul-04 8:33

is there a class in VB.net that is close to the Vector class in java?

Re: Vector

Colin Angus Mackay31-Jul-04 3:28

Colin Angus Mackay

31-Jul-04 3:28

See the System.Collections and System.Collection.Specialized namespaces for a list of collection classes

Re: Vector

fo0lish31-Jul-04 4:03

fo0lish

31-Jul-04 4:03

yup I found that shortly after I posted but it seems it doesent have the same kinda functions that it does in java, but after a nice little search I found a DLL that was made on planet sorcecode that lets you have the same function's in VB, just needed to call the reference.
thanks for the info anywho

Graphical Representation of Sound intensity

alexvw30-Jul-04 7:36

alexvw

30-Jul-04 7:36

Is there any way to graphically represent sound (waves or bars or anything) intensity. Like those in the Graphic equallizers that dinamically move? Confused | :confused:

Thanks.;)

I knew that writting decent code was not easy, but not so complex :p

Re: Graphical Representation of Sound intensity

Dave Kreskowiak1-Aug-04 3:59

Dave Kreskowiak

1-Aug-04 3:59

If you want to write your own solution, you'll have to do some reasearch into Fast Fourier Transforms, or FFT. You'll find that it's a bit CPU intensive to do. There are plenty of examples on the web, but you'll have to translate most of them to VB.NET yourself. Just search for "Fast Fourier Transform Spectrum Analyzer".

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

Re: Graphical Representation of Sound intensity

ppomor15-Jan-13 7:49

ppomor

15-Jan-13 7:49

If you want there are two ways to display the audio file.
1. Analog output, like a old oscilloscope.
For this, just read the data file and display in a moving graph.
2. FTT graph.
This required a lot of process power, as you would need to keep
resampling on the fly. I'm not sure if your looking to do any
type of analysis, so the Analog output method would be more well
suited

Redirecting Standard output in an unmanaged DLL

madfiddlerchris30-Jul-04 4:56

madfiddlerchris

30-Jul-04 4:56

I have a WINDOWS application that calls an unmanaged DLL (it's a JNI). The DLL redirects standard output and standard error for the JVM that is initiated.

Unfortunately the DLL function returns an error whilst performing this redirection.

I have created a test CONSOLE application which, essentially does the same thing but I have redirected standard output and standard error before calling the function in the DLL and this works fine. Applying the same method in the WINDOWS application does not work and an error is returned

Here is the code for the CONSOLE app (that works)...

Imports System.Runtime.InteropServices
Imports System.IO

Module Module1

<DllImport("myJNI.dll")> _
Public Function myFunction() As Integer
End Function

Sub Main()

Dim returnCode As Int16
Dim stdout, stderr As String
Dim fsStdOut, fsStdErr As StreamWriter

Try
stdout = "c:\out.txt"
fsStdOut = New StreamWriter(stdout)
fsStdOut.AutoFlush = True
Console.SetOut(fsStdOut)
Catch exc As IOException
Debug.WriteLine(exc.Message & "Cannot open " & stdout & " file.")
End Try
Try
stderr = "c:\err.txt"
fsStdErr = New StreamWriter(stderr)
fsStdErr.AutoFlush = True
Console.SetError(fsStdErr)
Catch exc As IOException
Debug.WriteLine(exc.Message & "Cannot open " & stderr & " file.")
End Try

returnCode = myFunction()
Console.WriteLine("myFunction returned " & Str(returnCode))
fsStdOut.Close()
fsStdErr.Close()

End Sub

End Module

So does a .NET WINDOWS application tie up stdout/stderr in some way and if so how can I get around this?

Any help appreciated!

Re: Redirecting Standard output in an unmanaged DLL

madfiddlerchris30-Jul-04 5:58

madfiddlerchris

30-Jul-04 5:58

okay here's some more info

I added a windows form to the console application and chnaged the project properties to "Windows Application" and it works!!

...but the project I create via File/New/Project...VB.NET/Windows Application - that doesn't work!!! What gives? Confused | :confused:

merging projects??

kowplunk30-Jul-04 4:34

kowplunk

30-Jul-04 4:34

Is there a way to do this. I have 2 seperate projects that I want to be able to run together, and experienced problems when trying to import all the code into the other one, that and one has different references, so trying to manually import the code is a real pain.

but when I try to make reference to a class in the other project it cannnot find it.

Thanks for the help

Re: merging projects??

Dave Kreskowiak1-Aug-04 3:57

Dave Kreskowiak

1-Aug-04 3:57

Depending on how your projects are written, you can't just "merge" the two together. You'll most likely have to copy the files into one of the projects and modify them to use a common namespace.

The only other way to do it would be to add the two projects in question to the same Solution. Either way, you'll have to modify the code to work.

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

parsing video files in VB

Kevnar30-Jul-04 3:35

Kevnar

30-Jul-04 3:35

Please help. I'm writing a small app that needs to capture individual frames of video from a video file to a picture control.

What's the easiest way to do this in VB?

Any help would be greatly appreciated. Thanks. Thanks, and thanks again.

"Go to, I’ll no more on’t; it hath made me mad." - Hamlet

Re: parsing video files in VB

Kevnar1-Aug-04 22:07

Kevnar

1-Aug-04 22:07

Hey, kevnar, great question. Since nobody else answered you I went ahead and found the answer myself after many hours of searching. You'll find the answer to your question here:

http://www.shrinkwrapvb.com/avihelp/avihlp_3.htm[^]

I hope this helps. I just wanted to extend this kindness to a fellow member in the CP community. Have a great day. Wink | ;)

"Go to, I’ll no more on’t; it hath made me mad." - Hamlet

Package And deployment in VB.NET

Thangaraj P.V.30-Jul-04 2:27

Thangaraj P.V.

30-Jul-04 2:27

Hi,
I had created a desktop Client-Server application using VB.NET.

I want to create the setup file for it, so that I can use the setup to install in othe PC or computer.

I am using Setup Project given with VS.NET. (File-New-Project-Setup and deployment Projects-Setup project)
by this way I am able to package application.

but I'm facing the problem when Installing the created setup in other PC.

I'm getting the Error as "Client must be installed first with .NET Framework"

how to solve this problem

pls help me out in getting the solution.

Thanx and Regards,
Tthangaraj P.V.
tthangarajpv@yahoo.com

Re: Package And deployment in VB.NET

Dave Kreskowiak30-Jul-04 3:35

Dave Kreskowiak

30-Jul-04 3:35

You must install the .NET Framework on the machine first, before you can install your app.

There are a bunch of articles here on CP that deal with installing the .NET Framework with your application. Look at these[^] search results.

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

DirectX 9

Jim Taylor29-Jul-04 23:35

Jim Taylor

29-Jul-04 23:35

I have installed the managed directx sdk version 9. I have written an application in vb.net that displays some very basic artificial life forms that move in flocks around the screen using Microsoft.DirectX.DirectDraw. I am successfully drawing to both surfaces (Microsoft.DirectX.DirectDraw.Surface) and calling the Surface.Flip method to put the buffer surface's content onto the main surface (Surface.Flip makes the surface memory associated with the BackBuffer surface become associated with the front-buffer surface). What I can't manage to do is keep the back surface's content without it dissapearing i.e. I want to carry on overlaying what I am drawing onto it with each flip. I know why it is lost - when a flip is carried out the pixels are blitted to the main surface. I need some way of maintaining it on the back surface. Does anybody know how to do this?

Jim

Re: DirectX 9

Dave Kreskowiak30-Jul-04 3:09

Dave Kreskowiak

30-Jul-04 3:09

To adapt your engine to this, after the flip, you'd have to copy the image on the surface that's displayed to the back page surface.

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

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