No change on Suspend/Resume Layout - C# Discussion Boards

George_George8-May-08 21:49

8-May-08 21:49

Thanks Senthil,

Your reply is clear. One further question, I think for primitive types, there are pairs of relationship, example int and Int32 are the same thing, only different in names. Is my understanding correct (I can not find answers from any books or search)?

regards,
George

Re: value type inheritance

S. Senthil Kumar9-May-08 0:42

S. Senthil Kumar

9-May-08 0:42

George_George wrote:
One further question, I think for primitive types, there are pairs of relationship, example int and Int32 are the same thing, only different in names. Is my understanding correct (I can not find answers from any books or search)?

Yes, int is just an alias for System.Int32, uint for UInt32 and so on. The C# compiler translates the names to the appropriate .NET datatypes.

Regards
Senthil [MVP - Visual C#]
_____________________________
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Re: value type inheritance

George_George10-May-08 21:57

George_George

10-May-08 21:57

Thanks Senthil,

Great to learn from you. So, a final confirmation, Object is the root for all value types (including primitive value types and user defined struct value types), and for all reference types, right?

regards,
George

Re: value type inheritance

N a v a n e e t h8-May-08 3:22

N a v a n e e t h

8-May-08 3:22

George_George wrote:
We can not inherit one value type from another, for example, we can not make a struct inherit from another struct; -- I think it means there is no inheritance or derivation for value types.

Yes. Value types are not possible to inherit. You can use interfaces and implement it on a structure though.

George_George wrote:
All value types are inherits from ValueType, and ValueType is inherits from Object, seems value types could have inheritance or derivation?

Do you know System.ValueType is a class ? Not all value types are inherited from System.ValueType. There are some built in value types like integer. When you write a structure, it will be inherited from System.ValueType.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

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Re: value type inheritance

George_George8-May-08 3:33

George_George

8-May-08 3:33

Great answer, N a v a n e e t h!

Any comments to,

http://www.codeproject.com/script/Forums/View.aspx?fid=1649&msg=2543249[^]

regards,
George

Flicker with transparent labels on different panels

Sukhjinder_K7-May-08 23:08

Sukhjinder_K

7-May-08 23:08

I have a Form with a Panel mainBackPanel. To mainBackPanel I add different panels say redPanel, greenPanel, bluePanel depending on key pressed, r, g, b respectively. Each panel has a different image (say tomatoes, trees, sky) and a transparent label.

Now when the panel changes, I see a small flicker on the area covered by the label.

mainBackPanel (to which the individual panels are added) is double buffered.

The code, in .NET 2.0, can be found here[^].

You will need to put 3 image files namely fb.jpg, mf.jpg and pl.jpg in bin/debug folder prior to running the app.

Please suggest how to get rid of the flicker.

Thanks
Sukhjinder

Looking for help on my OpenSource Media Player LetsYo

Re: Flicker with transparent labels on different panels

phannon⁸⁶7-May-08 23:10

phannon⁸⁶

7-May-08 23:10

Before you do any processing on the images, use SuspendLayout[^] and when you're done use ResumeLayout.

He who makes a beast out of himself gets rid of the pain of being a man

No change on Suspend/Resume Layout

Sukhjinder_K7-May-08 23:16

Sukhjinder_K

7-May-08 23:16

All KeyEvents are being handled by MainForm in the following method

void mainFormKeyUpHandler(Object o, KeyEventArgs kev)
{
	if( kev.KeyCode == Keys.R )
	{	
		this.mainBackPanel.Controls.Clear();

		this.mainBackPanel.SuspendLayout();	
		this.mainBackPanel.Controls.Add(this.mainFormPanel);
		this.mainBackPanel.ResumeLayout();
	}
	else
	.
	.
	.
}

<br />
<br />
But the result is still the same. <br />
<br />
<div class="ForumSig">Looking for help on my OpenSource Media Player <a href="http://sukhjinder.cn/letsyo/contribute.html">LetsYo</a></div>

Re: No change on Suspend/Resume Layout

phannon⁸⁶7-May-08 23:26

phannon⁸⁶

7-May-08 23:26

Move that suspend before Controls.Clear() as that may also cause some flickering. Might solve it for you.

He who makes a beast out of himself gets rid of the pain of being a man

Doesnt work

Sukhjinder_K7-May-08 23:28

Sukhjinder_K

7-May-08 23:28

Tried that too. It doesn't work.

Looking for help on my OpenSource Media Player LetsYo

Some workarounds...

Sukhjinder_K9-May-08 2:54

Sukhjinder_K

9-May-08 2:54

I searched the web and found many people having similar problems. Typical scene is you remove a control and add a new one. This causes a flicker. I searched the Internet and found some potential solutions but couldn't understand them much. Can you help me with it?
Solution #1[^]

Solution #2[^]

Solution #3[^]

Looking for help on my OpenSource Media Player LetsYo

Drag & Drop & More

willy20057-May-08 23:07

willy2005

7-May-08 23:07

Hi.
i'm developing an application in c#.
The first part is a typical application with forms, database queries, etc...
In a second phase, i need to design a panel with several buttons, with different captions, each button represent a complex vector shape with textures, for example a table, a computer, a tv...

When the user clicks on a button, a shape appears in a canvas. The user can drag and drop the shape and resize it.
If the user resize the shape, the texture must auto-adjust to the new size (tile effect).

In addition, it is necessary to implement a collision detector, to prevent "illegal positions".
f.e.: The table only can be placed in the floor and the tv only over the table, etc..

I need to chose an option (WPF, DIRECT2D, GRAPHICS CLASS ...)

1. ¿What option you recommend me?
2. Someone knows open source libraries or similar examples?

Thanks in advanced and sorry for my basic english Blush | :O

How to delete Cookies

Waheed Ur Rehman7-May-08 22:38

Waheed Ur Rehman

7-May-08 22:38

i am using the following code

System.IO.File.SetAttributes(Environment.GetFolderPath(
Environment.SpecialFolder.Cookies ).ToString(), FileAttributes.Normal);

DirectoryInfo directory = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.Cookies));
if (directory.Exists)
DeleteFiles(directory);

public void DeleteFiles( DirectoryInfo directory)
{
FileInfo[] info = directory.GetFiles();
foreach (FileInfo file in directory.GetFiles())
{
try
{
System.IO.File.SetAttributes(file.FullName, FileAttributes.Normal);

file.Delete();
}
catch (Exception ex)
{

}
}
foreach (DirectoryInfo dir in directory.GetDirectories())
{
try
{
DeleteFiles(dir);
}
catch (Exception ex)
{
}
}

}
This code is deleting all files in the Cookie folder but the problem is index.dat file remains there it gives error
Used by another person or program
What should i do to delete that file
Thanks

Re: How to delete Cookies

Ashfield7-May-08 23:56

Ashfield

7-May-08 23:56

index.dat is a system file and should not be deleted.

Find out more here

Bob
Ashfield Consultants Ltd

Re: How to delete Cookies

Waheed Ur Rehman9-May-08 2:04

Waheed Ur Rehman

9-May-08 2:04

but cookies get restored

Re: How to delete Cookies

Ashfield9-May-08 22:37

Ashfield

9-May-08 22:37

Obviously they will, when you visit a website that uses them. However, your questions was about deleting index.dat, which has nothing to do with the cookies.

Bob
Ashfield Consultants Ltd

Re: How to delete Cookies

boblaw9911-May-08 16:16

boblaw99

11-May-08 16:16

You can use windows API to delete all the cookies.
The functions below are useful:
FindFirstUrlCacheEntryEx, FindNextUrlCacheEntryEx, DeleteUrlCacheEntry.
They are defined in wininet.dll.

Process.Start() Issue

Harvey Saayman7-May-08 22:27

Harvey Saayman

7-May-08 22:27

Hey guys

i need to run external console programs from within a console program... this i can do but the snag comes in were i have to wait for process1 to finish before i start process2

heres what i have

static void Main(string[] args)
{
    ProcessStartInfo process1 = new ProcessStartInfo("ring.exe");
    Process.Start(process1);

    //
    // Wait For process1 to finnish
    //

    ProcessStartInfo process2 = new ProcessStartInfo("ringLouder.exe");
    Process.Start(process2);

    Console.Read();
}

any ideas?

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Re: Process.Start() Issue Cont....

Harvey Saayman7-May-08 22:38

Harvey Saayman

7-May-08 22:38

Ive now seen that when the process class is used as an instance there is a WaitForExit() method

but now i'm getting an error on myProcess.Start("ring.exe"); " System.Diagnostics.Process.Start(string)' cannot be accessed with an instance reference; qualify it with a type name instead "

here is the code

Process myProcess = new Process();
myProcess.WaitForExit();
myProcess.Start("ring.exe");

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Re: Process.Start() Issue

Spunky Coder7-May-08 22:39

Spunky Coder

7-May-08 22:39

try use the following

//Wait for window to finish loading.
process1.WaitForInputIdle();
//Wait for the process to exit or time out.
process1.WaitForExit(5000);

.....

Re: Process.Start() Issue

Harvey Saayman7-May-08 22:43

Harvey Saayman

7-May-08 22:43

hey

those methods are in an insance of the Process class, my "process1" is an instance of the ProcessStartInfo class

plz read my 2nd post Process.Start() Issue cont...

thanx

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Re: Process.Start() Issue

Spunky Coder7-May-08 22:48

Spunky Coder

7-May-08 22:48

oops..i haven't noticed it .

.....

Re: Process.Start() Issue

Harvey Saayman7-May-08 22:50

Harvey Saayman

7-May-08 22:50

its okay

i found the sollution

here is what i needed to do...

Process myProcess = new Process();
            
            myProcess = Process.Start("ring.exe");
            myProcess.WaitForExit();

thanx for trying tho

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
think BIG and kick ASS

you.suck = (you.passion != Programming)

Re: Process.Start() Issue

Spunky Coder7-May-08 22:46

Spunky Coder

7-May-08 22:46

hmm... it seems WaitForInputIdle method only works with processes that have a user interface...

Alternatively i think u can do that using threading..i'm not sure

.....

Capture Batch-File Data

Reelix7-May-08 20:12

Reelix

7-May-08 20:12

I'm wondering if anyone could help me in this one... I'm attempting to execute a simple Batch-File, and capture the output.

So far, I have something along the lines of:

System.Diagnostics.Process tyroTest = new System.Diagnostics.Process();
batchTest.StartInfo.FileName = Application.StartupPath + @"\myFile.bat";
//batchTest.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
//string batchText = batchTest.StStandardOutput.ReadToEnd();
batchTest.Start();
StreamReader sr = batchTest.StandardOutput;
MessageBox.Show(sr.ReadLine());

but am carrying on recieving errors like:

StandardOut has not been redirected or the process hasn't started yet.

As you see by the commented-out code, I've tried multiple variations...

Any hints, anyone?

Smile | :)

-= Reelix =-

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