Visual Basic

4-Nov-08 19:22

I am writing a code where I need to construct a chain of points. I have the code in C, but for my limitations in this language I am trying to convert it to VB.NET. The problem is:

My main class is

public class Point
public x as double
public y as double
public shrared pl, pr as new point() 'previous and next point
End class

My goal is to be able to access the evolution of the point. So, I need this type of declaration
...
dim p0 the new Point()
...
p0.pr.x = 2
p0.pr.y = 4
...

What's happening is that when I that when I set p0.pr.x = 2 or p0.pr.y = 4 (or another property of pl or pr) all the values of x and y are changed. That is, p0.pr.pr.pr.pr...pr.x = 2 and p0.pr.pr.pr.pr...pr.y = 4. That should not happen. Can you tell me how to change the value of a variable only at a level of p?

Sorry but my english is terrible!!!

Thanks in advance
Wilson

Guffa4-Nov-08 22:04

Guffa

4-Nov-08 22:04

wilson_borda wrote:
What's happening is that when I that when I set p0.pr.x = 2 or p0.pr.y = 4 (or another property of pl or pr) all the values of x and y are changed.

No, that's not what's happening. What's happening is that the single instance that you reference with the static variable changes. Regardless of how many Point instances you create, they all share a single pl and a single pr instance.

If you are trying to create a linked list, the pl and pr variables can't be static. However, if you change them to be member variables, you can't create new instances of them in the constructor or you will create an eternal loop that fills the memory with Point objects.

Despite everything, the person most likely to be fooling you next is yourself.

wilson_borda5-Nov-08 1:37

5-Nov-08 1:37

Thanks for reply. You are correct. I try to change to member variables and a exception occurs... I can't solve this problem. But you are right, the pl and pr variables can not be static...

Steven J Jowett4-Nov-08 22:13

Steven J Jowett

4-Nov-08 22:13

If I unserstand correctly you wish to store a list of Points so you could have something list this :-

Public Class PointHistory

Private _myPoints As List(Of System.Drawing.Point)

Public ReadOnly Property Count()
Get
Return _myPoints.Count
End Get
End Property

Public ReadOnly Property Point(ByVal Index As Integer) As System.Drawing.Point
Get
Return _myPoints(Index)
End Get
End Property

Public ReadOnly Property CurrentPoint() As System.Drawing.Point
Get
Return _myPoints(Count)
End Get
End Property

Public Sub Add(ByVal NewPoint As System.Drawing.Point)
_myPoints.Add(NewPoint)
End Sub

End Class

wilson_borda wrote:
Sorry but my english is terrible!!!

Never applogies for trying.

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

wilson_borda5-Nov-08 1:42

5-Nov-08 1:42

Thanks... My class "point" don't refers to drawing.point. My second choice is use a List or Collection implementation. Now I try to do this. But, in some parts of my code (not showed in the previous msg) is very dificult use List instead of a structure like my class...

Steven J Jowett5-Nov-08 2:01

Steven J Jowett

5-Nov-08 2:01

Is the modified class below, more like what you are after?

Public Class PointHistory

Public Structure Point
Dim x As Int32
Dim y As Int32
End Structure

Private _myPoints As List(Of Point)

Public ReadOnly Property Count()
Get
Return _myPoints.Count
End Get
End Property

Public ReadOnly Property Point(ByVal Index As Integer) As Point
GetReturn _myPoints(Index)
End Get
End Property

Public ReadOnly Property CurrentPoint() As Point
Get
Return _myPoints(Count)
End Get
End Property

Public Sub Add(ByVal NewPoint As Point)
_myPoints.Add(NewPoint)
End Sub

Public Sub Add(ByVal x As Int32, ByVal y As Int32)
Dim newPoint as Point
newPoint.x = x
newPoint.y = y
_myPoints.Add(newPoint)
End Sub

End Class

Steve Jowett
-------------------------
Real programmers don't comment their code. If it was hard to write, it should be hard to read.

wilson_borda5-Nov-08 3:19

5-Nov-08 3:19

Yes, this is the idea. However, I have to modify my code because class "PointHistory" don't have recursive property like (a class inside the same class):

public class point
dim x,y as double
dim pl,pr as point
end class

I call like this

dim p0 as new point

p0.pl.pl...x=...

Now I use

dim hist as new pointhistory
... initialize hist (add points)
dim p0 as new pointhistory.point

p0=hist.pont(index)

....

Thanks again...

Guffa5-Nov-08 7:53

Guffa

5-Nov-08 7:53

wilson_borda wrote:
dim p0 as new pointhistory.point

p0=hist.pont(index)

Don't use the new keyword when you only want to declare a reference, as that will create an instance of the class. As you assign a new instance to the reference in the next line, the newly created instance will just be thrown away.

Despite everything, the person most likely to be fooling you next is yourself.

Re: Out of Memory Exception

Mark Churchill5-Nov-08 11:50

Mark Churchill

5-Nov-08 11:50

Public Class Point
   Public x as Double
   Public y as Double
End Class

Dim pts as new LinkedList(Of Point)

If you are converting the code, use all the features of your new platform. I'd even argue that you should use the PointF struct provided by the framework. I'm messing around writing game engines at the moment, and theres nothing more annoying than every damn library having their own version of Vector3 and Matrix.

Mark Churchill
Director, Dunn & Churchill Pty Ltd
Free Download: Diamond Binding: The simple, powerful, reliable, and effective data layer toolkit for Visual Studio.

Alpha release: Entanglar: Transparant multiplayer framework for .Net games.

Out of Memory Exception

AR Reddy4-Nov-08 17:42

AR Reddy

4-Nov-08 17:42

Hi,

I am getting out of memory exception when I run my project Build. While resizing the forms and minimize/maximize the forms I am getting the Out of memory exception and sometimes application terminationg also.

As per my observation this error is coming when I am working with many open applications and long time continuously.

Will it be a code problem or any application or build settings we need to set?

Please let us know. This is very urgent for us very impartent.

Thanks in Advance,

AR Reddy

_Damian S_4-Nov-08 19:52

_Damian S_

4-Nov-08 19:52

I was getting the same thing here using VS2008. We upped the RAM to 3 Gig in the box I'm using, and I only build when most code and design screens are closed, and never with any Crystal Reports open in the IDE.

Good Luck!

--------------------------------------------------------
Knowledge is knowing that the tomato is a fruit.
Wisdom is not putting it in fruit salad!!

[Message Deleted]

songkeqiang4-Nov-08 15:07

songkeqiang

4-Nov-08 15:07

[Message Deleted]

Re: How can I access the IE Temporary folder?

Dave Kreskowiak4-Nov-08 16:20

Office Communications Server

4-Nov-08 16:20

Open a command prompt and type:

CD "%USERPROFILE%\Local Settings\Temporary Internet Files"
DIR /A /S /P

Here, you'll find the real directory structure under that alias. These are the paths you use to copy files from.

A guide to posting questions on CodeProject[^]

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

alexfromto4-Nov-08 10:07

alexfromto

4-Nov-08 10:07

Hi.

My company is running Office Communicator 2007 for IM. Thie tool has one issue, which I'm trying to resolve. When you try to message to offline people the message will never be delivered. I'm not sure why this functionality is not there, especially when MSN LIVE does have this feature.

I need to find the way to identify people offline and store the message in DB so then they sign in to Communicator that stored message could be retreived and delivered to them. As you can see there are 2 requirements for this job. 1. Store message if user offline 2. Retreive and deliver message when user signs in.

How can I accomplish that? Is Office Communications Server 2007 SDK the answer?
Did any body had experince in programming for Office Communications Server 2007?

Thanks a lot.

Re: Office Communications Server

Dave Kreskowiak4-Nov-08 16:21

4-Nov-08 16:21

alexfromto wrote:
How can I accomplish that?

I have no idea since I've never written anything for Communicator.

alexfromto wrote:
Is Office Communications Server 2007 SDK the answer?

More than likely.

A guide to posting questions on CodeProject[^]

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

HTML Auto-Indent

Saul Johnson4-Nov-08 7:49

Saul Johnson

4-Nov-08 7:49

Hi All!

I'm struggling a bit with auto indenting HTML in my application. I have tried TidyCOM (HTML Tidy) but upon encountering an error in the HTML it just stops and outputs nothing. How Annoying for my end-users.

I've tried making my own HTML auto indent function but after weeks of trying I just can't do it! Does anybody know of a convenient way to auto-indent HTML?

Thanks!

MrWolfy Big Grin | :-D

Re: HTML Auto-Indent

Dave Kreskowiak4-Nov-08 16:23

4-Nov-08 16:23

You might want to start with Googling for "HTML Pretty control".

A guide to posting questions on CodeProject[^]

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

Re: HTML Auto-Indent

Saul Johnson6-Nov-08 9:05

Saul Johnson

6-Nov-08 9:05

Hi and Thanks!

I tried... but couldn't find anything that looked suitable. Am I looking in the wrong places? Can you recommend anything in particular?

Thanks Again!

MrWolfy Big Grin | :-D

Re: HTML Auto-Indent

Dave Kreskowiak7-Nov-08 13:21