Re: I have a few questions :) - C# Discussion Boards

c# multiple forms communication

29-Dec-09 6:20

abcurl wrote:
I need suggestion for my implementation that whether my approach is right or wrong

The easiest way to determine whether your implementation is right, is by testing it. Well, does it work?

Looks readable enough, why are you doubting?

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ikurtz29-Dec-09 4:31

ikurtz

29-Dec-09 4:31

greetings, i have 3 forms that need to communicate with each other.

what is the best way of achieving this?

at present im considering using delegates.

your comments are welcome.

my app is c# windows forms.

Re: c# multiple forms communication

Saksida Bojan29-Dec-09 4:48

Re: c# multiple forms communication

29-Dec-09 4:48

You can use delegate, events or static.

I recommend you use static class if app is not Multi-Thread.

public static settings
{
// No constructor
  public static String Info;
}

with this class you must use directly not initialize it.

Form1_OnLoad(Object sender, EventArgs e)
{
settings.Info = "I have set this text to static member of settings class";
}

dan!sh 29-Dec-09 5:03

dan!sh

29-Dec-09 5:03

Delegates seem good in case it should happen on occurrence of some event.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Re: c# multiple forms communication

coolestCoder29-Dec-09 22:23

coolestCoder

29-Dec-09 22:23

If it is a one way communication (i.e. from parent to child) you may consider adding an overloaded constructor. If you want 2 way communication, then delegates would be useful.
By the way, what kind of a communication you are talking about ?
What objects would be passed to and fro ?
Details would be great.

Thanks !

"A good programmer is someone who looks both ways before crossing a one-way street." -- Doug Linder

coolestCoder

I have a few questions :)

Raztor029-Dec-09 4:30

Raztor0

29-Dec-09 4:30

Firstly, I would like to say that I have tried Google-ing my problems but nothing really helps at all.

Now let me introduce myself before asking you all my questions :P I'm 16 years old, and I have a culminating to complete for school. However, I do not need help with the actual code. Another thing you should know is I'm not that advanced with C# so I'll ask my question as best I can Smile | :)

I am in the process of making a Tetris game in C#, and am running into a couple problems that I'd like to know if there is a solution to. So let's begin.

First question: As I was getting the Tetris to work and it's coming together, I realized that I was re-drawing EVERYTHING each time something new happens. Is it possible to somehow tell C# to only redraw a specific part of the screen (the falling piece) rather than every other piece on the screen every time? Since those pieces won't be moving unless I complete a row, I really don't want to have to tell it to draw them every time. Also, I noticed if I don't tell it to draw, it won't draw them, and they won't appear. Which didn't solve my problem at all Frown | :(

Second question: IF the above is not possible or anything like that, is there any way to tell the application to use more of the available RAM in the system? I'm asking this because, seeing as the Tetris program lags when there's many pieces on the board, it really does sound miraculous how popular games like Call of Duty don't lag on this computer.

Thanks to everyone reading this and if anyone needs further clarification just post a comment and I'll try to answer Smile | :)

Saksida Bojan29-Dec-09 4:41

29-Dec-09 4:41

I assume you are using GDI+ to draw. try using double buffer.

this.SetStyle(ControlStyles.DoubleBuffer, true);

Instead to draw every command to screen, it draws to memory and when all completed, it draws already completed drawing from memory. Always use .Flush to clean graphic controls after usage.

also you can use this.Invalidate(Rectange) to force update of specific region.

Here are some articles about tetris:
A .Net Tetris game in c# using GDI+[^]
Falling Blocks Game[^]

DiscoJimmy29-Dec-09 5:01

DiscoJimmy

29-Dec-09 5:01

As the other guy said, I assume you're using GDI+. This is bad. GDI+ was not meant for games. Call of Duty certainly does not use GDI+. You need to go to microsoft's download site and download the XNA 3.1 game libraries. Don't worry about all the xbox stuff, you can write all the code in C# and it'll run on windows.

You'll have to rewrite some of your drawing code, but if you organized it properly the game logic should all copy over as is. This will be 10x faster than using windows forms gdi stuff.

FYI, this ALSO isn't what the call of duty folks are using, but it's a lot closer.

Raztor029-Dec-09 7:37

Raztor0

29-Dec-09 7:37

Ah, thanks to both of you that answered. That makes sence Smile | :)

And alright, I'll try the invalidate(Rectangle) thing, I hope that works. And also, I'll download XNA and I'll play around with it. Thanks again guys.

Saksida Bojan29-Dec-09 8:12

Windows automation with C#

29-Dec-09 8:12

If you want alternative to XNA, you can look at SlimDX. This framework was developed after microsoft decidec to stop developing Managed Direct X. I noticed of its exsistence, when I needed to install after i installed comercial game. Yes it is very popular and I wont say the name, because I do not want to advertise

DiscoJimmy29-Dec-09 4:26

DiscoJimmy

29-Dec-09 4:26

I see a lot of people on here making new libraries and tools for things that we could already do, but it's not as easy as it ought to be and I think that's great. You know what I'd love to see? A really robust library for .NET aimed at windows automation. I'm frequently having to automate things in windows(and ubuntu but lets not get into that), and I'll use either AutoHotKey, AutoIT, or VBScript, and I have to say, compared to statically typed, compiled, object-oriented C#, those languages blow.

So if anyone's looking for a good article subject or community project, I'd love to see a good library in C# code that had SendKey, MouseClick, ActivateWindow, etc. but now the user could leverage all the power of C# along with it.

Just a thought.

Resize of Custom Control And Excluding control

Saksida Bojan29-Dec-09 4:02

29-Dec-09 4:02

Witch attribute I need to set, so that designer can resize control only vertical or horizontal Simular to Textbox. It can be resized only by width as long as it doesn't have Multiline property to true.

Is there an if statement, so that code executing code is excluded, while the control is being rendered by Design view.

Currently I am at work, so I don't have much time to google around.

I have Read a Book "GDI+ Application Custom Controls with Visual C# 2005", This book is nearly an introduction to custom controls. Is there any book with more advance topics?

Eddy Vluggen29-Dec-09 6:34

29-Dec-09 6:34

Saksida Bojan wrote:
Witch attribute I need to set, so that designer can resize control only vertical or horizontal Simular to Textbox. It can be resized only by width as long as it doesn't have Multiline property to true.

That's probably not done using an attribute, but by setting some maximum and minimum widths. Perhaps even guarding those, in the Resize-event.

Saksida Bojan wrote:
Currently I am at work, so I don't have much time to google around.

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Saksida Bojan29-Dec-09 10:30

29-Dec-09 10:30

Eddy Vluggen wrote:
That's probably not done using an attribute, but by setting some maximum and minimum widths. Perhaps even guarding those, in the Resize-event.

Does not help. Even if I set Minimum and maximum width, designer still shows that can be resized in any direction. Look at Textbox and notice you can't change height, because simply you can't grab on resize rectangle when control is selceted

Eddy Vluggen30-Dec-09 5:45

30-Dec-09 5:45

Saksida Bojan wrote:
Does not help. Even if I set Minimum and maximum width, designer still shows that can be resized in any direction. Look at Textbox and notice you can't change height, because simply you can't grab on resize rectangle when control is selceted

I found this solution on SO[^], which you probably already tried;

protected override void SetBoundsCore(int x, int y,
     int width, int height, BoundsSpecified specified)
{
  if (this.DesignMode)
    base.SetBoundsCore(x, y, 500, 490, specified);
  else
    base.SetBoundsCore(x, y, width, height, specified);
}

I are Troll Suspicious | :suss:

Saksida Bojan5-Jan-10 1:49

5-Jan-10 1:49

I am sorry for late reply, but this code does exactly as i would use resize event or setting min and max size. this.DesignMode is part of an answer and i thank you for it. I have just found a book with more advance topics. I am sure it will be there. Thank you for your time

Saksida Bojan12-Feb-10 19:03

12-Feb-10 19:03

I Found the way to use what i wanted.
I added a dll reference: system.Design.dll
I added using System.Windows.Form.Design

[ToolboxItem(true)]
[Designer(typeof(testDesigner))] // Designer need
public class test : Button
{
   [Browsable(true)]
   public bool MultiLine
   {
      get
      {
         return testDesigner.m;
      }
      set
      {
         testDesigner.m = value;
      }
   }
}
public class testDesigner : ControlDesigner
{
   public static bool m;
   public override SelectionRules SelectionRules
   {
      get
      {
         if (!m)
            return SelectionRules.LeftSizeable | SelectionRules.RightSizeable | SelectionRules.Visible | SelectionRules.Moveable;
         else
            return SelectionRules.BottomSizeable | SelectionRules.TopSizeable | SelectionRules.Visible | SelectionRules.Moveable;
      }
   }
}

Eddy Vluggen13-Feb-10 1:10