Re: How many instances do I have in the following example? - C# Discussion Boards

How many instances do I have in the following example?

12-Dec-06 3:26

If you've got VS2005 why do you need to reverse engineer to Visio? You can create a class diagram in Visual Studio directly.

the last thing I want to see is some pasty-faced geek with skin so pale that it's almost translucent trying to bump parts with a partner - John Simmons / outlaw programmer

Deja View - the feeling that you've seen this post before.

Shy Agam12-Dec-06 2:50

Shy Agam

12-Dec-06 2:50

Hello,

How many instances of x do I have in the following example?

class MyBaseClass<br />
{<br />
    protected static int x;<br />
}<br />
<br />
class MyDerived1 : MyBaseClass { }<br />
class MyDerived2 : MyBaseClass { }<br />
<br />
MyDerivedClass1 c1;<br />
MyDerivedClass1 c2;<br />
<br />
MyDerivedClass2 c3;<br />
MyDerivedClass2 c4;

I would say for sure that c1 and c2 share the same x.
But what about c3 and c4?
Do they share c1's and c2's x?
Is a new static x allocated for them?

Thanks in advance,
Shy.

Re: How many instances do I have in the following example?

baerten12-Dec-06 3:09

baerten

12-Dec-06 3:09

Hi, i would say that x has every where the same value.

Because the static-Element is a type, outside of all instances.
Each instance has access to this variable and can manipulate it.
And your derived classes have derived this permission to this element.
So i think all instances can alternate this static variable.

I never use/try it before, but it seems logic for me.

Re: How many instances do I have in the following example?

Pete O'Hanlon12-Dec-06 3:21

Re: How many instances do I have in the following example?

12-Dec-06 3:21

Why not try and code it up and see what you get when running it? You've done the hard work already so testing it should be easy.

Shy Agam12-Dec-06 3:28

Shy Agam

12-Dec-06 3:28

Just did... Big Grin | :-D

It appears that only one instance of X is allocated.

Re: How many instances do I have in the following example?

Pete O'Hanlon12-Dec-06 3:44

autoscroll property of an MDI

12-Dec-06 3:44

Which is consistent with the behaviour of static. Big Grin | :-D

sathishtl00712-Dec-06 1:36

sathishtl007

12-Dec-06 1:36

Hi,

How can I set the autoscroll property of an MDI from without losing its MDIcontainer property.

When I set the AutoScroll Property to "True", IsMdiContainer Property is automatically set to "False". How can I make both the property to true simultaneously.

If anyone has any idea, please reply me soon.

Thanks

Re: autoscroll property of an MDI

stancrm12-Dec-06 1:53

Re: autoscroll property of an MDI

12-Dec-06 1:53

I've tried it in VS2005, if you set IsMdiContainer = true, then you can see that AutoScroll will be set to false, but if I try to put the window outside the border, scrollbar will be shown. That means, AutoScroll is always true (don't see Properties Window... Smile | :)

) if you set IsMdiContainer=true.

sathishtl00712-Dec-06 2:08

sathishtl007

12-Dec-06 2:08

But the problem is that Whatever the child window size the scroll bar is showing
for a fixed size. I want this autoscroll property for zooming in and out the images in a child window.

Re: autoscroll property of an MDI

Pete O'Hanlon12-Dec-06 2:32

How to pass a form name to a sub program

12-Dec-06 2:32

Then the autoscroll should be on the child form.

mwith12-Dec-06 1:32

mwith

12-Dec-06 1:32

Hi All,
I am new to C# and OOP. I refered a article about Single instance child for in MDIhttp://www.codeproject.com/csharp/single_instance.asp?df=100&forumid=51798&select=1394073#xx1394073xx[^])

I tried to write a sub program to stop that code duplication as follows

private void frmLoad(Form frmNew)<br />
        {<br />
            Form[] charr = this.MdiChildren;<br />
            if (charr.Length == 0)      // no child form is opened<br />
            {<br />
                frmNew sus = new frmNew();<br />
                sus.MdiParent = this;<br />
                sus.StartPosition = FormStartPosition.Manual;<br />
                sus.Location = new Point(0, 0);<br />
                sus.Show();<br />
            }<br />
            else      // child forms are opened<br />
            {<br />
                int count = 0;<br />
                foreach (Form chform in charr)<br />
                {<br />
                    if (chform.Name == "frmNew")// one instance of the form is opened<br />
                    {<br />
                        chform.Activate();<br />
                        count = 0;<br />
                        break;   // exit loop<br />
                    }<br />
                    else<br />
                        count++;<br />
                }<br />
                if (count > 0)<br />
                {<br />
                    frmNew sus = new frmNew();<br />
                    sus.MdiParent = this;<br />
                    sus.StartPosition = FormStartPosition.Manual;<br />
                    sus.Location = new Point(0, 0);<br />
                    sus.Show();<br />
                }<br />
<br />
            }<br />
        }

I want to pass a form name as a argument. what is wrong with this?

Please can anybody help me? Cry | :((

mWith

Re: How to pass a form name to a sub program

stancrm12-Dec-06 1:49

one port for many clients Or many ports for each client ?

12-Dec-06 1:49

Just create a member variable for frmNew:

private Form2 frmNew = null;
private void CreateFrmNew()
{
  if (frmNew == null)
  {
    frmNew = new Form2();
    frmNew.MdiParent = this;
    frmNew.StartPosition = FormStartPosition.Manual;
    frmNew.Location = new Point(0, 0);
  }

  frmNew.Show();
}

Call CreateFrmNew, it will create frmNew if not exists, otherwise frmNew will be shown.

MarkPhB12-Dec-06 1:25

MarkPhB

12-Dec-06 1:25

Hi im writing a TCP Server/Client application and i have a general Question. Smile | :)

When i have a TcpServer that will communicate with many clients.

Shall i communicate with the clients over one port

OR

Shall i communcate with the clients over one several port for each client ?

OR

Is it so, that the .NET-Framework handle this for itself and its no problem
to communicate with many client over one port ? Sniff | :^)

Re: one port for many clients Or many ports for each client ?

stancrm12-Dec-06 1:32

Re: one port for many clients Or many ports for each client ?

12-Dec-06 1:32

Everytime the client connected to your server, it will create a new TcpClient instance. That's why, you must use:

TcpClient tcpClient = tcpServer.AcceptTcpClient();

Just add this tcpClient to a list, and you can manage your connection to many clients using each tcpClient.

MarkPhB12-Dec-06 4:48

MarkPhB

12-Dec-06 4:48

Yea i know but i use AcceptSocket(). Smile | :)

But i thought that it can slow down the application when so many connections go over the same port =/

or did i though wrong ?

Urgent - Need help with Hangman Game

China-Gary12-Dec-06 1:20

China-Gary

12-Dec-06 1:20

Im having a bit of difficulty doing a small simple Hangman game, im a novice at C# so any help would be handy thanks!

stancrm12-Dec-06 1:28

12-Dec-06 1:28

http://www.codeproject.com/netcf/hangman_dncf.asp

quiteSmart12-Dec-06 1:42

quiteSmart

12-Dec-06 1:42

please explain your problem

ed^nrgc12-Dec-06 2:15

ed^nrgc

12-Dec-06 2:15

What have you done so far?