C# Discussion Boards - CodeProject

Re: textboxes

Christian Graus11-Jul-05 13:05

Christian Graus

11-Jul-05 13:05

That's fine, you can select the position one past the last character. I remember doing this once before.

A question about ListBoxes...

Lord Kixdemp10-Jul-05 10:57

Lord Kixdemp

10-Jul-05 10:57

Hello everyone! Big Grin | :-D

OK, just a question now... I made a music program that has a ListBox with a music note in each item. When the music plays, the selected note in the ListBox changes according to which note is playing, but there's a problem... When the playing note reaches the bottom of the ListBox, it pauses for a second to go down... How can I fix this? Thanks! Wink | ;)

Darth_Sulfur (Sulfurik)
http://www.SulfurSoft.tk
ftp://tsfc.ath.cx
http://tsfc.ath.cx
hotline://tsfc.ath.cx

shallow/deep copy-- I give up......

...---...10-Jul-05 6:42

...---...

10-Jul-05 6:42

Can someone provide a 'Foo' type example to explain a shallow and deep copy.
I've read so many explanations that seem to contradict each other that I'm lost. "objects referenced" part of most definitions is what is troubling me..
thanks....

Re: shallow/deep copy-- I give up......

S. Senthil Kumar10-Jul-05 6:50

S. Senthil Kumar

10-Jul-05 6:50

It's pretty simple actually. A shallow copy is when you copy just the references to an object, a deep copy copies the objects themselves. For example

class Foo
{
}

class Bar
{
  Foo f;

  public Bar ShallowCopy()
  {
    Bar b = new Bar();
    b.f = this.f;
    return b;
  }

  public Bar DeepCopy()
  {
    Bar b = new Bar();
    b.f = f.DeepCopy();
    return b;
  }
}

The Bar object returned by ShallowCopy and the original Bar object both have the same reference to the Foo object. DeepCopy, as you can see, copies the Foo object itself. Note that if Foo has references to some other objects, then it needs to DeepCopy those also and so on. Basically, DeepCopy recursively copies the entire object graph.

Hope this helps.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: shallow/deep copy-- I give up......

leppie11-Jul-05 0:54

leppie

11-Jul-05 0:54

S. Senthil Kumar wrote:
public Bar ShallowCopy()
{
Bar b = new Bar();
b.f = this.f;
return b;
}

or

public Bar ShallowCopy()
{
  return (Bar) MemberwiseClone();
}

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: shallow/deep copy-- I give up......

S. Senthil Kumar11-Jul-05 1:25

S. Senthil Kumar

11-Jul-05 1:25

I did know about MemberwiseClone, I deliberately wrote it that way because I thought it explained shallow copying better.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Windows services.. Please Help me urgently

Zeeshan Gulzar10-Jul-05 6:35

Zeeshan Gulzar

10-Jul-05 6:35

I have created three windows services in which two services listening two different logical ports continously and one service capture COM ports. These windows services informs the Main Window Application which is also running in different Application Domain or Window Process space. These services and windows application is created in C# .NET

My Question is that which is the best way to communicate between these Windows Services running on the same machine (locally).

1. DOT NET Remoting Services
2. Message Queues
3. Through Socket
4. Through Database

Reliability and scalibility is the main requirement because this machine act as a server and traffic is very high.

Your co-operation would be highly appreciated.
Thanks

Zeeshan

ListView column resize broken column

ARBR10-Jul-05 4:53

ARBR

10-Jul-05 4:53

I have a ListView Control and I make its width bigger in Resize() Event...
when it get bigger, it gets over the space of my program has before Resizing.
And the last column has broken of its right that over the line of newly added space of my program.
right side of last column is cutted and thown away. but the detailed item is shown precise.
I tried varous value for columnHeader3.Width but it broken again and again.
Of course, I don't mistake the order of resizing the listView and the panel that has it.
Please give me a hand for the solution.

InitializeComponent()......
this.listView1 = new System.Windows.Forms.ListView();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.columnHeader3 = new System.Windows.Forms.ColumnHeader();
this.listView1.Alignment = System.Windows.Forms.ListViewAlignment.Default;
this.listView1.BackColor = System.Drawing.Color.Gainsboro;
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,this.columnHeader2,this.columnHeader3});
this.listView1.FullRowSelect = true;
this.listView1.GridLines = true;
this.listView1.Location = new System.Drawing.Point(4, 120);
this.listView1.Name = "listView1";
this.listView1.Scrollable = false;
this.listView1.Size = new System.Drawing.Size(190, 50);
this.listView1.TabIndex = 5;
this.listView1.View = System.Windows.Forms.View.Details;
//
// columnHeader1
//
this.columnHeader1.Text = "Name";
this.columnHeader1.Width = 70;
//
// columnHeader2
//
this.columnHeader2.Text = "Grade";
this.columnHeader2.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.columnHeader2.Width = 40;
//
// columnHeader3
//
this.columnHeader3.Text = "Battle";
this.columnHeader3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.columnHeader3.Width = 100;

and...my_SizeChanged(object sender, System.EventArgs e)
{
this.listView1.columns[2].Width=-2;
this.columnHeader3.Width=-2;
}

I am going to make it. complete the vision.

C# XML

Newbie_Toy10-Jul-05 4:10

Newbie_Toy

10-Jul-05 4:10

How can I edit existing attribute in xml file.

Re: C# XML

DavidNohejl10-Jul-05 4:25

DavidNohejl

10-Jul-05 4:25

For example, you can use XmlDocument. You only need to find your atribute, change its value and save changes with XmlDocument.Save() method. Or you can use XmlReader/XmlWriter combination + temp file to do the same. Which to choose depends on size of XML file. (use XmlReader/XmlWriter for really big files)

Btw you can (should) post this to XML/XSL forum.

David

How can we let a windows service sending a message ?

Blue_Skye10-Jul-05 0:44

Blue_Skye

10-Jul-05 0:44

I have a windows service and i want it to send a message such as ("i'm processing") when i start doing a function to an application (web or windows app). How can i do that?
Anyone can help me? I'm very need it for my project. Thanks!

Re: How can we let a windows service sending a message ?

S. Senthil Kumar10-Jul-05 3:23

S. Senthil Kumar

10-Jul-05 3:23

Did you look into .NET remoting? You can host a remote object in your service, get a reference to it in your application and then call the appropriate method on the remote object when you want to send a message.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: How can we let a windows service sending a message ?

Blue_Skye10-Jul-05 6:30

Blue_Skye

10-Jul-05 6:30

.NET remoting? No, i've never heard of that. Thanks your suggestion. I'll try it. Smile | :)

Open File Dialog

Expert Coming9-Jul-05 23:44

Expert Coming

9-Jul-05 23:44

I have an Open File Dialog, it has the right to open multiple files. How do I determine which file is which? First from second, and then how do I do a different thing with them?

Re: Open File Dialog

Tomas Petricek10-Jul-05 0:00

Tomas Petricek

10-Jul-05 0:00

Something like this?

if (openFileDlg.ShowDialog()==DialogResult.Ok)<br />
{<br />
  foreach(string file in openFileDlg.FileNames)<br />
  {<br />
    // do something with file<br />
    MessageBox.Show(file);<br />
  }<br />
}

Tomas Petricek (Microsoft C# MVP)
www.eeeksoft.net | Photos | ASP.NET Multi-column layout control

Re: Open File Dialog

Dave Kreskowiak10-Jul-05 8:38

Dave Kreskowiak

10-Jul-05 8:38

There is no garantee that the first filename clicked on, or selected, will be the first filename you get in the enumeration of the list. There is no way to deteremine which filename was first with any certainty.

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

GIF Images

Expert Coming9-Jul-05 23:22

Expert Coming

9-Jul-05 23:22

How do you get a picture box to display two images overlapping. They would be gifs, so they are transparent.

Example

Green.gif
Rock.gif

Green is a gif that is 50x50 pixels and all green.
Rock is a picture that is transparent and has a small brown circle in the center.

I want the rock to be on the green(Grass)

Thanks for input.

Re: GIF Images

Expert Coming9-Jul-05 23:42

Expert Coming

9-Jul-05 23:42

Ok, I know how to do it. You can make two levels by making one a background, and the other the image.

COM in C#

pakFari9-Jul-05 19:19

pakFari

9-Jul-05 19:19

Hi, anyone can help me in making COM in C#, i have a inventory system can i convert it into COM, or COM+. please tell me about good web-link or basic steps to foliow. thanks

Re: COM in C#

Denevers10-Jul-05 2:34

Denevers

10-Jul-05 2:34

Everything can be found in CodeProject.

http://www.codeproject.com/dotnet/COM_DOTNET_INTEROP.asp[^]

Denevers

Re: COM in C#

pakFari10-Jul-05 7:33

pakFari

10-Jul-05 7:33

it seem to be good, to clear the concepts, can u help in coding, or can suggest any coding tutorial,thanks

Re: COM in C#

mav.northwind10-Jul-05 7:41

mav.northwind

10-Jul-05 7:41

Why not search for yourself? There are many articles here on CP showing you how to code COM classes in C#.

mav

Form not behaving in a panel that's in a panel

SirKnight9-Jul-05 17:38

SirKnight

9-Jul-05 17:38

I have an app that creates a panel that has the docking style set to fill (filling up the whole program) and another panel added to the control list of this first panel, which is quite large btw (about 5Kx5K). Now I'm wanting to add little Forms to this larger panel and that seems to work ok. Right now I do "myFrm.Parent = bigPanel" where myFrm is of course a Form() and bigPanel is Panel(), obviously. So I see my form there and can move it around, but once I move the scroll bars which come up from the first panel (AutoScroll set to true) it appears that the form moves around like it should, but it's really not. I can't then move the form around until I do something to the main app that causes a paint, like shake the program around, or resize it, etc. Also when the form "sticks" like this, I can actually click and drag it around if I click where the title bar of the form was BEFORE I scrolled, which usually for me is near the center of the form. This seems quite odd and I'm not sure how to fix it. Maybe somehow I need to update the position of the form when the panel scrolls or something, I'm not really sure. Any one know why this could be happening? You can see it for yourself easily if you re-create a test app how I described to see what I'm talking about if I'm not 100% clear. Thanks!

Re: Form not behaving in a panel that's in a panel

Luis Alonso Ramos10-Jul-05 0:30

Luis Alonso Ramos

10-Jul-05 0:30

Well, you're not supposed to put a Form-derived class as a child window of another form (unless it is a MDI child, which is another story). I don't know why what you do works, but I wouldn't expect it to.

For your situation, if you want a form that can be moved inside another form, try MDI parent/child forms. It will work much better.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

Re: Form not behaving in a panel that's in a panel

SirKnight10-Jul-05 7:39

SirKnight

10-Jul-05 7:39

I was kind of thinking I needed to do MDI but I thought maybe I could make it work the other way, o well. Thanks though, I'll changed things around so I make use of MDI. Hopefully everything will go smoother now. Smile | :)

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