Visual Basic

rwestgraham10-Mar-05 8:59

rwestgraham

10-Mar-05 8:59

Does he have the same version of the NET Framework installed that the exe was compiled with?

Ray Cassick10-Mar-05 9:01

Ray Cassick

10-Mar-05 9:01

Does the person getting your exe have the .NET framework installed?

They need that installed to run ANY .NET application.

The error test would be nice to see also...

Paul Watson wrote:
"At the end of the day it is what you produce that counts, not how many doctorates you have on the wall."
George Carlin wrote:
"Don't sweat the petty things, and don't pet the sweaty things."
Jörgen Sigvardsson wrote:
If the physicists find a universal theory describing the laws of universe, I'm sure the a**hole constant will be an integral part of that theory.

Dave Kreskowiak10-Mar-05 9:50

10-Mar-05 9:50

Why is it everyone always says "I get an error", or something similar. WHAT'S THE ERROR?! How on earth does anyone expect an answer to the question "Why?" when all the information they give is "It's broke..."?

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

ADY00710-Mar-05 10:00

ADY007

10-Mar-05 10:00

My friend doesn't have the vb.net installed to his pc. Either the .net framework i think because the .net framework comes witht the vb.net packet. What if, I make a program to someone and he doesn't have the .net framework. what can i do?

Dave Kreskowiak10-Mar-05 10:36

User Control problem/error

10-Mar-05 10:36

Nothing. If he doesn't have the .NET Framework installed, which you can get from Windows Update, or download from Microsoft here for v1.1[^], then he can't run your app at all.

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

Shawn200010-Mar-05 7:25

Shawn2000

10-Mar-05 7:25

Hi,

I have a user control which I am puting a TreeView control onto. I have started to add code to the code-behind to populate the TreeView but am getting real problems. Origonally I had the TreeView working fine on it's own on a form, but wanted to make this more generic so I could use it on many other forms.

The error I am getting is "Object reference not set to an instance of an object", which normally means that something needs to be defined as "new", but I am getting this when I drop the user control on the form.

The code in the user control is as follows:

Public Class ProductSpecItems<br />
    Inherits System.Windows.Forms.UserControl<br />
<br />
    Private Sub ProductSpecItems_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
        Me.treeProductSpecifications.Nodes.Clear()<br />
        Me.treeProductSpecifications.Nodes.Add(New TreeNode("Product Specifications"))<br />
        Dim tNode As New TreeNode<br />
        tNode = Me.treeProductSpecifications.Nodes(0)<br />
<br />
        PopulateTreeView(0, tNode)<br />
        tNode.Expand()<br />
    End Sub<br />
<br />
    Private Sub PopulateTreeView(ByVal inParentID As Integer, ByRef inTreeNode As TreeNode)<br />
        'populate the Product Specifications Tree view<br />
        Dim ParentTable As New DataTable<br />
        Dim ParentRow As DataRow<br />
<br />
        Dim sSQL As String<br />
<br />
        sSQL = "SELECT ID, DESCRIPTION, PARENTID FROM PRODUCTSPECIFICATIONITEM WHERE PARENTID=" & inParentID & " ORDER BY DESCRIPTION"<br />
        ParentTable = SCDatabase1.getDataTable(sSQL)

'<----- IT FAILS ON THIS LINE

    End Sub<br />
End Class

From the above code I have indicated which line it's falling over on.
I have a global class which defines the Database connection as
Public SCDatabase As New Database(StockControlConnectionString)
so I always have it available. I don't know if this is the best way but it works for everything else I have done.

Can someone help me with this as it's driving me mad. I can not understand why I am getting the error when dropping the user control on the form?

Many thanks for the help.
Shawn

Ray Cassick10-Mar-05 8:30

Ray Cassick

10-Mar-05 8:30

I have had cases like this where I was not paying attention tot he order that things take when a component (or a form) initializes.

One big thing to remember is that when your control is dropped onto a form it get initialized so there is a moment where things that you think are 'on' the component have not been created yet.

Where are you calling this code from?

Shawn200010-Mar-05 8:38

Shawn2000

10-Mar-05 8:38

Hi Ray,

Thanks for the quick reply. I think I understand what you mean, although, how would I get over the fact that the database connection etc has not been initialised?

The code that I have pasted above is on the user control.
The global/public database connection is in a seperate class.

Regards
Shawn

Dave Kreskowiak10-Mar-05 9:47

10-Mar-05 9:47

The control should either be handling it's own connection to the database, or the control should not be handling the connection at all. The best, most generic, way to do it is if the control is NOT handling any database connections. This should be provided by the parent application. The control should be passed a DataSet that it parses and fills the tree with.

Remember what your controls job is and keep it simple. If you add the connection database code to the control, your control will forever be tied to that database. If you have it just handle a passed in DataSet, then the data can come from anywhere, so long as the parent application passes it in in the format that the control expects and can handle.

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

dataset sharing between forms

Shawn200010-Mar-05 10:23

Shawn2000

10-Mar-05 10:23

ah right. Thank you. I think I have got the understanding of it now! Big Grin | :-D

I done a lot of code in VB6 so still getting to grips with .net

I will give your suggestions a go. I certainly understand what you are saying. I can see the logic in it now.

Thanks again
Shawn

rayfouc10-Mar-05 7:14

rayfouc

10-Mar-05 7:14

I'm trying to use a dataset created in one form in another but:
Public Shared DataSetleadsONm1 As DataSet
Dim dsr1 As DataRow
Private Sub frmjobs2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
For Each dsr1 In DataSetleadsONm1.Tables("PRODLEADS").Rows
dosn't work
any help would be apreciated

ray foucher

Re: dataset sharing between forms

Raistlin21_4510-Mar-05 8:00

Raistlin21_45

10-Mar-05 8:00

You need to create an instance of the forms on each form before they can communicate

ex:

on form2

Public OldFrm As Form1

on form1

Dim NewFrm As New Form2<br />
Form2.OldFrm = Me

You need to do the second form first else it wont be recognized

Then you can call objets like this

on form1

NewFrm.MyDataset.MyTable("").Rows

Hope this helps

For every action there is an oposite and equal malfunction.

Re: dataset sharing between forms

j45mw12-Mar-05 17:12

j45mw

12-Mar-05 17:12

I believe that if you create the dataset in a module then you should be able to access it from any form you create in your project.

playing a wav file

Raistlin21_4510-Mar-05 7:07

Raistlin21_45

10-Mar-05 7:07

I'm using this code to play a wav file;

Public Shared Sub PlayWaveResource(ByVal WaveResourceName As String)<br />
<br />
        ' get the resource into a stream<br />
        Dim resourceStream As Stream<br />
        resourceStream = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("AssemblyName." + WaveResourceName)<br />
        If resourceStream Is Nothing Then Exit Sub<br />
<br />
        ' bring stream into a byte array<br />
        Dim wavData As Byte()<br />
        ReDim wavData(CInt(resourceStream.Length))<br />
        resourceStream.Read(wavData, 0, CInt(resourceStream.Length))<br />
<br />
        ' play the resource<br />
        PlaySound(wavData, 0, SND_ASYNC)<br />
End Sub

but it's not playing the right sound, it plays the standard windows error sound instead WTF | :WTF:

any ideas? Confused | :confused:

For every action there is an equal and opposite malfunction

Help Required Upgrading VB6 project to VB Net -> specifically VarPtr solution

Quenchmaster10-Mar-05 1:40

Quenchmaster

10-Mar-05 1:40

i have been trying to upgrade the VB6 project that can be
found at
http://www.vbaccelerator.com/home/VB/Code/vbMedia/Audio/WAV_File_Viewer/article.asp
I have managed to get the majority done, using a combination of the upgrade
facility and some programming of my own. I have now unfortantly got stuck
with the following line of code: Sniff | :^)

copymemory(VarPtrArray(iWav), VarPtr(tSA), 4)

(copymemory being the standard API call to RtlMOveMemory in kernel32)

The problem i have is the VarPtr command, and to some extent the VarPtrArray
command. I need a solution for VBnet.

Background information:
tSA is variable of the following structure:

StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi) _<br />
Private Structure SAFEARRAYBOUND<br />
Dim cElements As Integer<br />
Dim lLbound As Integer<br />
End Structure<br />
<br />
StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi) _<br />
Private Structure SAFEARRAY2D<br />
Dim cDims As Short<br />
Dim fFeatures As Short<br />
Dim cbElements As Integer<br />
Dim cLocks As Integer<br />
Dim pvData As Integer<br />
VBFixedArray(1) Dim BoundsR() As SAFEARRAYBOUND<br />
Public Sub Init()<br />
ReDim BoundsR(1)<br />
End Sub<br />
End Structure

and is created just before the copymemory line by

Dim tSA As SAFEARRAY2D<br />
tSA.Init()

and propulated with

With tSA<br />
.cbElements = 2<br />
.cDims = 2<br />
.BoundsR(0).lLbound = 0<br />
.BoundsR(0).cElements = m_cWAVRead.ReadbufferSize<br />
.BoundsR(1).lLbound = 0<br />
.BoundsR(1).cElements = 2<br />
End With

iwav is created in the following method

Dim iWav() As Short

If you need any more information please email me at
adrian.game@nospamWarwick.ac.uk (please remove the nospam)
or reply to the post. I have both the orignal VB6 project, the VBnet project
created using the upgrade wizard and my
own semi working version.

Thanks for any help provide

Adrian

Random Number Generator

jarlath9-Mar-05 23:35

jarlath

9-Mar-05 23:35

Can anyone help me?
I need to develop in VB.net a random number generator that can generate a lottery number selection equal to 6 numbers and a bonus number. Each number must be different from all other numbers. I am tying myself in knots trying to work this out.
Please help me!

Jarlath Gallagher
Western Connect
Derry
N.Ireland

Re: Random Number Generator

J4amieC10-Mar-05 5:02

J4amieC

10-Mar-05 5:02

When asking for help on homework questions its good to keep in mind that people shouldnt/wont just give you the code...this would defeat the purpose. It is also import to describe what you've tried, and be specific about the question you are asking. A general question like the above will often illicit zero response.

OK, now for some help I can try to provide given the info above. There are many ways to approach this problem, i'll go with the easiest (far from the best, and very far from the most efficient).

In PSEUDOCODE:

1) Generate a random number between 1-49
2) Store number in a searchable list (eg ArrayList)
3) Generate another random number
4) If the number generated by 3) is already in the list from 2) go back to 3) and try again
5) continue 3) and 4) until 6 numbers + 1 bonus number are in list (ie list.Count == 7)

There are undoubtable algo's that can do this much faster, which im sure you can find by searching for "Lottery number generator algorythm" - the above process is very simplistic and can be knocked up quickly.

Re: Random Number Generator

jarlath10-Mar-05 11:12

jarlath

10-Mar-05 11:12

Well i'll try this again;

I have created an array containing 7 randomly generated numbers. I want these numbers to be mutually exclusive i.e. same value only occur once.

I have tried to in VB.net programming develop a set of nested if..then statements to test each drawn number against each element in the array.

This process is fraught with difficulty and more often than not does not guarantee a list of exclusive numbers and duplicates do occur. Plus it takes 50 lines of code. Resource intensive!

Is there a more efficient code in VB.net that will validate the content of my array and ensure it is mutually exclusive.

Thank you for the help so far

J.Gallagher
Western Connect

How to make a start up form using the coding.

ADY0079-Mar-05 22:59

ADY007

9-Mar-05 22:59

I have a registration program which when you open the program a registration form appear telling the user to enter the specific number. If the user enter the specific number then he can use the Full program without again entering the registration number the second time he opens the program. I want to change the start up form from the registration form to the program directly! Can someone tell me the coding pls because I am in a big problem!

Thanks alot!!

ADRIAN De BATTISTA

Re: How to make a start up form using the coding.

Dave Kreskowiak10-Mar-05 5:11

10-Mar-05 5:11

You've written your application incorrectly. The Startup form should be your main application. When it starts, it should check to see if the program is registered. It should then call the registration form if needed. Once the application starts on a form, that form hold the message pump for the entire application. Once started, the message pump CANNOT be transferred to another form.

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

abt c graphics

Anonymous9-Mar-05 19:41

Anonymous

9-Mar-05 19:41

consider Dave is a dos game.
if we develop a graphics pgm in c it need BGI files to run this. how dave.exe running without that BGI files.

Re: abt c graphics

Dave Kreskowiak10-Mar-05 5:08