Problems in VB.net? - Visual Basic Discussion Boards

Re: Two listboxes on same form appear linked?

Dave Kreskowiak6-Jul-04 4:24

6-Jul-04 4:24

What you did was bind ListBox1 to a datasource, then you cleared out that datasource and entered new information into it. So, yes, both istBoxes will have the same information behind them. The information from a datasource is not copied into the listbox, it is BOUND.

The solution is to create to diferent arrays and bind them to their respective listboxes.

'I'm assuming you Dim'd an ArrayList as arlAL...
Dim arlAL1 As New ArrayList()
Dim arlAL2 As New ArrayList()
 
xmlDoc.Load("../xml/BatchConfig.xml")
xmlNdList = xmlDoc.GetElementsByTagName("Unit")
For i = 0 To xmlNdList.Count - 1
    arlAL1.Add(xmlNdList.Item(i).Attributes("Id").Value)
Next
ListBox1.DataSource = arlAL1
 
xmlNdList = xmlDoc.GetElementsByTagName("Phase")
For i = 0 To xmlNdList.Count - 1
    arlAL2.Add(xmlNdList.Item(i).Attributes("Id").Value)
Next
ListBox2.DataSource = arlAL2

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

Accessing parallel port by using VB.Net

marcus_gsh5-Jul-04 21:23

marcus_gsh

5-Jul-04 21:23

Please help me ! Can you show me the codes that allow one to access the parallel port both the read and write operations by using visual basic.net programming

Re: Accessing parallel port by using VB.Net

Dave Kreskowiak6-Jul-04 2:54

Dave Kreskowiak

6-Jul-04 2:54

You can't do it directly because the O/S abstracts the hardware from software. You need a cute little driver to do the work for you. See http://www.logix4u.net/[^] for a good start.

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

Re: Accessing parallel port by using VB.Net

marcus_gsh7-Jul-04 20:07

marcus_gsh

7-Jul-04 20:07

Hi, thanks for ur reply. But, I found an information as below,
" To write data to LPT1, use the following code:
Success = WriteFile(hParallelPort, Buffer, Buffer.Length, BytesWritten, IntPtr.Zero)"

In this statement, the author didn't mention about the read operation. Do sir know it?

As sir reply,
is there compatible to implement in visual basic.net?
The dll file can use in vb.net?
All the code in that site can use in vb.net?

Thanks for your help, thank you very much!!!

Mail program in VB6

Ravi S.V.5-Jul-04 19:34

Ravi S.V.

5-Jul-04 19:34

I wrote a small program in VB6 where my mails should be sent to the recepient. But my program puts my mails in the outbox only. I have to go to outlook express then click on Send/Receive button then my mails go to sent items folder. But this is not the right way, I wanted my program to send the mails directly to the recepient. I used mapi controls for this program.

Is there any other i can do by making reference to COM component or by using any APIs.

plz, help me out.

Thanx,
Ravi.

Re: Mail program in VB6

Hesham Amin5-Jul-04 22:12

Hesham Amin

5-Jul-04 22:12

check www.planetsourcecode.com[^]
select visual basic category then write smtp in the search box..
i've got many results this way.

Question for the VB guys

#realJSOP5-Jul-04 15:55

#realJSOP

5-Jul-04 15:55

I've written a DLL in VC6 (C++), and I think it's going to be used by a VB programmer. Knowing this ahead of time, I return variants from all exported functions.

I've tested the DLL with a C++ program, but I don't have VB installed and don't care to install it.

1) What do I need give the VB programmer in terms of info about the exported functions in the DLL?

2) Can someone here download and try the DLL in a VB program? If so, go here to download the DLL (includes the C++ test program source):

http://www.paddedwall.org/john/programmer/code/d3dlltest.zip

[EDIT] I correct the html link problem. [/EDIT]

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Problems in VB.net?

mythinky5-Jul-04 15:39

mythinky

5-Jul-04 15:39

Helo, this is some problems occurs. Anyone can help?
1. How to get the current directory of the application.exe when I installed the application?
2. For "shell" command, if i am calling app.exe, do i need to specify the path?
3. How to make the close button to be hide button. I mean the close button that come with VB.Net is automatically function as close the form, i want to change it into hide button, which hide the form. How could i do that?
4. I have specified a form that the showintaskbar to false and the windowstate to minimized, but when i click the notify icon, which is set the showintaskbar to true and windowstate to normal, it only works for the showintaskbar, it doesn't work for windowstate. The form won't display unless i set to maximize. How can be like this?
Thanks...

Learning .NET

Re: Problems in VB.net?

Colin Angus Mackay6-Jul-04 1:00

Colin Angus Mackay

6-Jul-04 1:00

1. Use Environment.CurrentDirectory

2. "shell" command? Do you mean you are using the Process class to start an application?

3. Handle the Closing event on the form and set the Cancel property in the event arguments to true. Then you can provide your own behaviour.

"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

The Second EuroCPian Event will be in Brussels on the 4th of September

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

My Blog

Re: Problems in VB.net?

Dave Kreskowiak6-Jul-04 3:10

Dave Kreskowiak

6-Jul-04 3:10

2. It's usually a good practice to specify the full path to the app you want to launch. That way, you leave nothing to chance that the app can't be found.

3. Be careful how you implement this. If you just cancel the close event constantly, your app will never quit. This will stop Windows from restarting and shutting down. You'll have to override WndPrc and watch for the WM_ENDSESSION message. When you receive this message, you should set a flag in your code that is checked upon the Close event firing. This will tell you wheather or not you should really close your app or just minimize it.

4. This is normally because your window's normal state size is essentially 0 by 0. Try setting the size of the window to known values before you set it's state to normal.

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

Re: Problems in VB.net?

Martin Dionne14-Jul-04 12:07

Martin Dionne

14-Jul-04 12:07

mythinky wrote:
3. How to make the close button to be hide button. I mean the close button that come with VB.Net is automatically function as close the form, i want to change it into hide button, which hide the form. How could i do that?

Adding the following to your form should do the trick:

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    Const WM_SYSCOMMAND As Integer = &H112
    Const SC_CLOSE As Integer = &HF060

    If m.Msg = WM_SYSCOMMAND AndAlso m.WParam.ToInt32 = SC_CLOSE Then
        Me.Hide()
        Exit Sub
    End If

    MyBase.WndProc(m)
End Sub

–Marty

How does Unload works exactly?

jlopezpenalba5-Jul-04 5:18

jlopezpenalba

5-Jul-04 5:18

Because my one-form-app doesn't end completely after invoking 'Unload Me': in fact, the form hides, but I can see the program still running in the task manager and I need it to finish completely.

I have a timer and i was wondering if this is the problem. I am sure i stop it before the form unloads (timer.Interval= 0), but i don't know if it needs a more 'explicit' stop.

Does anybody know how to close a VB application properly with Unload? Or does anybody know alternatives to Unload? Or does anybody know what's wrong with my timer?

Re: How does Unload works exactly?

beowulfagate5-Jul-04 14:01

beowulfagate

5-Jul-04 14:01

Is this a VB6 or a VB.NET application?

Re: How does Unload works exactly?

jlopezpenalba5-Jul-04 21:11

jlopezpenalba

5-Jul-04 21:11

It's a VB6 application.

Re: How does Unload works exactly?

Dave Kreskowiak6-Jul-04 3:24

Dave Kreskowiak

6-Jul-04 3:24

By setting the Timer Interval to 0, just've told the Timer to fire it's event nearly continuously. You haven't disabled it. You need to set the Timer's Enabled property to False to turn it off. This is probably what's keeping your form open.

Also, the only event you can't reliably use Unload in is the Form_Load event. Anywhere else is fine.

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

Socket Listener To A USB Bluetooth Connected To PC

hani_aql5-Jul-04 3:33

hani_aql

5-Jul-04 3:33

Hi Guys...
Do any body knows how to create a socket that listen to all the incomming to a USB Bluetooth Dongle connected to my PC..??
Or how can i figure out the port number that dongle connected to..? All i know that is is connected to the "COM8" Port..!! Confused | :confused:

any ideas or simple code will b helpfull..!
thx

Hani M.Aql

INSERT Fails

Anonymous5-Jul-04 1:52

Anonymous

5-Jul-04 1:52

Hi,

i try to insert values to a Access DB from VisualBasic .All the fields are TEXT datatype.For null values i assign vbNullChar(also i tried with vbNull).

Insert statement is:
con.Execute "Insert INTO " & TableName & " (" & tempFields & ") VALUES (" & tempInputs & ")", 1, 1

tempFields & tempInputs are arrays.

But some how the insert fails with the error:
Error :

Desc: "[Microsoft][ODBC Microsoft Access Driver] Syntax error in INSERT INTO statement."
Number : -2147217900
source : "Microsoft OLE DB Provider for ODBC Drivers"

Pls help
Ram

Re: INSERT Fails

Hesham Amin5-Jul-04 4:56

Hesham Amin

5-Jul-04 4:56

insert does not work with arrays.
create a command object
OR :
specify each field by its own like :

Insert INTO TableName (Filed1,Filed2,Filed3)<br />
values (val1,val2,val3)

and ignore nullable fields.

Re: INSERT Fails

Dave Kreskowiak6-Jul-04 3:37

Dave Kreskowiak

6-Jul-04 3:37

The best way to go about that is to create a command object with your SQL statement, but use parameters in the appropriate places.

Dim sqlString As String = "INSERT INTO MyTable (Field1, Field2, Field3) VALUES (?, ?, ?)"
Dim comm As New OleDbCommand(sqlString)

comm.Parameters.Add("@Field1Value", OleDbType.VarChar, 80).Value = somevalue
comm.Parameters.Add("@Field2Value", OleDbType.VarChar, 80).Value = somevalue
comm.Parameters.Add("@Field3Value", OleDbType.VarChar, 80).Value = OleDbType.Empty

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

vb.net and forms

mrdance4-Jul-04 21:20

mrdance

4-Jul-04 21:20

I have some problems accessing a form when using a public sub in a module as startup object.

Module:

Friend frmMain as Friend
dim frm as new form1
frm.show
call Fill()
public sub Main

public sub Fill
frmmain.text = "ok"
end sub

In the form:

form1_load

frmmain = me

I am doing something/somethings wrong. I want to be able to reach this form after creating it like altering the caption in sub Fill. Any ideas how I do this?

thanks / Henrik

end sub

--- neteject.com - Internet Solutions ---

Re: vb.net and forms

Dave Kreskowiak6-Jul-04 3:49

Dave Kreskowiak

6-Jul-04 3:49

Well, the code you posted won't even compile. Try copying and pasting next time. The code frmMain = me doesn't do anything constructive at all. I don't know what you trying to do here.

First, when your Sub Main reaches the end, your app is going to quit. You have to give the form control to keep it's message pump running so your app won't quit. I assume you doing something in the Sub Main before displaying the form. This should take care of your problem.

Module Module1
    Public Sub Main()
        Dim myForm As New Form1
        Fill(myForm)
        Application.Run(myForm)
        myForm.Dispose()
    End Sub

    Private Sub Fill(ByRef form As Form)
        form.Text = "My Caption Text..."
    End Sub
End Module

But, if this is all you wanted to do, then you would create a normal Windows Forms application and put this in the Form Load Event:

Me.Text ="My Caption Text..."

or change the appropriate properties in the Property Page in the Forms Designer.

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

Re: vb.net and forms

mrdance12-Jul-04 4:55

mrdance

12-Jul-04 4:55

thanks, but what if I want to open a form from the mainform and then set myform.text. How can I do that the best and most efficient way? Should I use "Friend" and if so, how do I use that?

thanks / Henrik

--- neteject.com - Internet Solutions ---

Re: vb.net and forms

Dave Kreskowiak12-Jul-04 12:36

Dave Kreskowiak

12-Jul-04 12:36

Dim nextForm As Form2
nextForm.Text = "Set some text here..."
nextForm.Show()

You really should take a look at this[^] article on MSDN.

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

DataRelation

Guerven4-Jul-04 17:50

Guerven

4-Jul-04 17:50

I have an Access table that has a parent table named TBLBooks and several tables that relating to it.

What im trying to do:
I am trying to display the TBLbooks information on a set of textboxes and display the authors on a datagrid.

What I have accomplished:
I successfully displayed the information on the textboxes and added buttons to move around the Book records. (Using BindingMAnagerBase).
I also already added a relationship into the dataset (using BookID which is present in both tables TBLbooks,TBLauthors)

I was able to display the authors on the grid but it wouldn't move with the TBLbooks (textboxes).

THE PROBLEM:
I need to show the AUthors information on my grid and is should move or change with my textboxes. I can't use Rowfilter to filter the Authors information. I really need to make the relation work. Eek! | :eek:

Is there any piece of code that you have that does just this?
*parent-child data relation with datagrid*
or ofcourse you could tell me how to do it. Laugh | :laugh:

Marvin N. Guerrero
- Casting More!!

Program help please

Anonymous4-Jul-04 8:01

Anonymous

4-Jul-04 8:01

Any one have time to help with school project? I am trying to create a random graph generator with a given proboility 0 < p < 1, probability that the edge exsist between to nodes in a graph (undirected and not weighted), using an adjacency matrix. I must then time the execution of DFS and BFS to see which perform best and show stats to prove it. I am having trouble with timing the algorithms and random generators for the graph....any ideas?

Thanks

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