Adding a control from within a class - Visual Basic Discussion Boards

[Message Deleted]

JUNEYT10-Feb-09 6:15

JUNEYT

10-Feb-09 6:15

[Message Deleted]

Re: Why do I get "System.ArgumentOutOfRangeException" for recently added columns to listview?

Luc Pattyn10-Feb-09 6:27

Luc Pattyn

10-Feb-09 6:27

Hi,

did you create subitem(10) before you tried to assign some text to it?
array elements need to be created before they can be operated on, same as simple objects: create first, then use.

How about ...items(5).subitems.add(something)

Smile | :)

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Re: Why do I get "System.ArgumentOutOfRangeException" for recently added columns to listview?

Dave Kreskowiak10-Feb-09 6:36

Dave Kreskowiak

10-Feb-09 6:36

First, the ListViewItem is the first column, so now you've got 10 columns left. These would be the SubItems of the ListViewItem, numbered 0 through 9, not 10.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: [Message Deleted]

Smithers-Jones10-Feb-09 7:21

Smithers-Jones

10-Feb-09 7:21

Do not delete your question, after you got an answer, ffs!!

"I love deadlines. I like the whooshing sound they make as they fly by." (DNA)

images/photos/pictures

ngugi10-Feb-09 5:42

ngugi

10-Feb-09 5:42

how does one go about attaching an image in Vb.net,more specifying its image and what data type is it when creating a table?

Re: images/photos/pictures

Henry Minute10-Feb-09 6:19

Henry Minute

10-Feb-09 6:19

There is a very interesting tool that has a name, something like google, you should learn to use it.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: images/photos/pictures

Dave Kreskowiak10-Feb-09 6:34

Dave Kreskowiak

10-Feb-09 6:34

ngugi wrote:
how does one go about attaching an image in Vb.net

To what??

ngugi wrote:
more specifying its image and what data type is it when creating a table

What table?? And what data type are you talking about? Type of what??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Adding a control from within a class

Paul Hasler10-Feb-09 4:16

Paul Hasler

10-Feb-09 4:16

This is a bit of a Newbie question... Blush | :O

I am trying to write a class which adds a control to it's host, where the host could be any suitable container such as a Panel, GroupBox, or a Form.

I know I can add a control directly to a Form for example in the following way:

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)_
Handles MyBase.Load
       Dim myControl As New SomeControl

       With myControl
           .Left = myLeft
           .Top = myTop
           .Width = myWidth
           .Height = myHeight
           .Visible = True
       End With

       Me.Controls.Add(myControl)

   End Sub

But I'm having trouble doing it from within a class.

   Public Class MyNewClass
    .
    .
    .
    Public Sub New(ByVal newLeft As Short, ByVal newRight As Short, ByVal newWidth As Short,_
ByVal newHeight As Short)
       myLeft = newLeft
       myRight = newRight
       myWidth = newWidth
       myHeight = newHeight

       Dim myControl As New SomeControl

       With myControl
           .Left = myLeft
           .Top = myTop
           .Width = myWidth
           .Height = myHeight
           .Visible = True
       End With

       Me.Controls.Add(myControl)

    End Sub

Clearly "Me" now refers to the instance of MyNewClass and not the Container or Form in which it is intended to go, so it's not going to work. Frown | :(

How should I do it?

Thanks in advance.

Re: Adding a control from within a class

JoeSharp10-Feb-09 4:30

JoeSharp

10-Feb-09 4:30

hi
pass a reference of the form to your class.

Public Sub New(ByVal newLeft As Short, ByVal newRight As Short, ByVal newWidth As Short,_ ByVal newHeight As Short, ByVal form As Form1)

regards

Re: Adding a control from within a class

Jon_Boy10-Feb-09 5:31

Jon_Boy

10-Feb-09 5:31

Your suggestion would work, but IMO the form should be adding the control not vice-versa.

Any suggestions, ideas, or 'constructive criticism' are always welcome.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

Re: Adding a control from within a class

Dave Kreskowiak10-Feb-09 6:33

Dave Kreskowiak

10-Feb-09 6:33

It's bad form to do what you're attempting. The child should know nothing of it's parent, nor should it modify the environment of the parent. The parent tells the child what to do, not the other way around.

Normally, the parent container would add the child controls to the form, with the child having implemented a common interface that the parent expects it to.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Adding a control from within a class

Paul Hasler10-Feb-09 11:47

Paul Hasler

10-Feb-09 11:47

Thanks for your comments. It got me thinking about my whole approach. Smile | :)

With a little more reading I realised what I'm actually trying to do is create a User Control.
I can stick all the controls I want in it, and handle events from the "sender".
Problem is now solved and working fine. Big Grin | :-D

Two questions regarding custom user controls and the toolbox.

Jon_Boy10-Feb-09 3:39

Jon_Boy

10-Feb-09 3:39

1. Is it possible to automatically add the custom controls to the toolbox as soon as the reference is added to a project? Meaning, the user would not have to right click and add the controls in manually to the toolbox.

2. How can the developer determine which group the custom controls appear under in the toolbox? For example, can I lump all custom controls under a new group called "ABC controls" automatically when the reference is added or when the user right clicks and adds the controls in?

Any suggestions, ideas, or 'constructive criticism' are always welcome.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

Re: Two questions regarding custom user controls and the toolbox.

Dave Kreskowiak10-Feb-09 4:05

Dave Kreskowiak

10-Feb-09 4:05

There is no method of having a control just pop into the ToolBox when you set a reference to a .DLL. You actually have to create an VSI installer package for the control (which is just a .ZIP file) to accomplish this.

You can find the quick'n'dirty explanation here[^]. The more cyptic Microsoft version can be found here[^].

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Two questions regarding custom user controls and the toolbox.

Jon_Boy10-Feb-09 4:17

Jon_Boy

10-Feb-09 4:17

Thanks for the links Dave.

Any suggestions, ideas, or 'constructive criticism' are always welcome.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

fingerprint image quality estimation

kebedetesema10-Feb-09 3:17

kebedetesema

10-Feb-09 3:17

hi everyone!
i want to store good quality images in a database. how could i do that?
whre can i find sample code in this area?

Re: fingerprint image quality estimation

Dave Kreskowiak10-Feb-09 3:57

Dave Kreskowiak

10-Feb-09 3:57

Your question has nothing to do with the subject line. So I don't know if this is going to answer your question, but... This has been asked and answers thousands of times all over the web. Google results for "vb.net save image to sql database[^]"

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Textbox value to Textbox in webpage

vijay248210-Feb-09 2:12

vijay2482

10-Feb-09 2:12

how to copy the values of a textbox into the textbox of a webpage where the cursor is already positioned in the textbox of the webpage

Re: Textbox value to Textbox in webpage

vaghelabhavesh10-Feb-09 3:37

vaghelabhavesh

10-Feb-09 3:37

What actually you want to achieve? Why you want to do this?
Your question is unclear to me.

Re: Textbox value to Textbox in webpage

shawndeprey10-Feb-09 14:53

shawndeprey

10-Feb-09 14:53

Do you want tome kind of hover effect or something to happen when the focus is given to the text box?

Re: Textbox value to Textbox in webpage

vijay248211-Feb-09 3:28

vijay2482

11-Feb-09 3:28

the text from the form has to be pasted in the text area on the website page where the cursor already points when the website is opened

needs to write a program with MATLAB using Simulated annealing technique

awoyale10-Feb-09 2:04

awoyale

10-Feb-09 2:04

is there anyone there who can assist me in teaching me how to write programs with MATLAB programming language using Simulated Annealing technique.

thanks samuel

Re: needs to write a program with MATLAB using Simulated annealing technique

Maxwell Barrett10-Feb-09 2:32

Maxwell Barrett

10-Feb-09 2:32

This might help you out...
http://en.wikipedia.org/wiki/MATLAB

Re: needs to write a program with MATLAB using Simulated annealing technique

Dave Kreskowiak10-Feb-09 3:54

Dave Kreskowiak

10-Feb-09 3:54

awoyale wrote:
how to write programs with MATLAB programming language

And this has what to do with VB.NET???

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Timing variations to get network answer during sending sms

scothyhut10-Feb-09 1:04

scothyhut

10-Feb-09 1:04

Hi All,

Sending bulk sms to mobile using serial port.

SMS sending is working. But each SMS takes different time(seconds) to receieve an network answer during sending SMS.
For eg: 1st number takes 4 seconds, 2nd number takes 6 sec, 3rd number takes 7 sec...etc
My problem is I have to fix a particular time(seconds) to every SMS.

I have tried with the code,

def_sec=0.0002
dt1=now

'loop 
        dt2=now
        sec=(dt2.ToOADate - dt1.ToOADate)
        if sec >= def_sec then
                'send sms
        else
               're send
        end if

but it doesn't give the result.
Give some ideas..

Thanks in Advance

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