C# Discussion Boards - CodeProject

Anonymous14-Mar-05 15:19

14-Mar-05 15:19

Fixed:

What I had forgotten (Actually what I had "learned", since I am a C# newbie) is that I need to include the .Resource file in the RSP file used to build the executable:

/res:C:\Compiler\Source\Pax\Pax.Form1.resources

Once I added this line to the RSP file, it ran flawlessly.

Thanks for all of your consideration!
Ray

listview with transparent background

grandad8014-Mar-05 8:21

grandad80

14-Mar-05 8:21

Hi,

Is there any way I can set the background of a listview to 'semi-transparent'? I have used

label1.BackColor = Color.FromArgb(40,40,0,0);

for the labels and want to create a similar effect for the listview.

Thanks very much

Configuration Files?

spacebass500014-Mar-05 7:39

spacebass5000

14-Mar-05 7:39

I was wondering what the majority of you all are using to store your apps configurations in. I come from a Linux background and would like to make use of flat text files with regards to holding my apps configurations.

Now I know that .NET makes good use of XML so can I assume that this is the direction to head in?

What do you all use?

Re: Configuration Files?

Anonymous14-Mar-05 8:58

Anonymous

14-Mar-05 8:58

2 different things to be discussed here: application configuration and user settings. app config file is somewhere where you'd store readonly database connection strings, defaults, and so on. User settings is somewhere where settings changed by the user (form size, preferences, etc) is stored in a read-write fashion.

App config is built in -- just create a file named <myexecutablename>.exe.config and place it in the same directory as your executable. The CLR will load it up for you automatically.

Msdn has some great articles on this, I suggest you search there.

Thread

Blue_Skye14-Mar-05 6:56

Blue_Skye

14-Mar-05 6:56

I wonder when we use it 'n how to use it right. I've heard that thread can not be used in any cases 'n it really confuse to use it too.
I'm doing a project about virtual stock exchange (an web application), and i think that thread maybe help my web application work faster. Is it right? Can someone give me some advise about thread. I haven't learn about it yet, all i know is there is a class named Thread in VS Smile | :)

Thanks!

Re: Thread

Judah Gabriel Himango14-Mar-05 7:26

Judah Gabriel Himango

14-Mar-05 7:26

Blue_Skye wrote:
i think that thread maybe help my web application work faster. Is it right?

No, using threads on a single processor system will actually perform slower than using a single thread. That said, using threads to do heavy work, freeing up your GUI thread to let the user continue working gives the appearance of improved performance. If you want more information about threads, there are plenty of articles on codeproject and msdn.microsoft.com regarding threading, synchronization, locks, semaphores and so on.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: He has a funny face. And he's my son.
Judah Himango

C# pixel color grouping

Rene Xavier14-Mar-05 6:56

Rene Xavier

14-Mar-05 6:56

Hi all,

I am new to C# GDI+ things. I try to add up the color occurence of the given jpg to array colorSumrySrc after comparing the pixel argb values of the incoming picture with the values in sysColors. The result would be there is no pixel color matched with sysColors and thus colorSumrySrc are all in zeros. The case is that the argb values for system Colors may not be exactly same as the color in input picture. So, I want to change the approach to just storing red, green, blue -> 3 major color categories in sysColors. But my concern here would be that the argb values for a color category is discreted, e.g. blue includes skyBlue, deepBlue... How can i specify the range of the color here for comparison? E.g. if a pixel color have argb value - 1111111, then if it falls to blue category that have range from -100000 to -200000, then my code will considered that pixel to be blue. Any one can help??

public string[] sysColors = new string[] {Color.AliceBlue.ToArgb().ToString()
...
,Color.AntiqueWhite.ToArgb().ToString()
} // array holds system color argb values for comparison

colorSumrySrc = new int[sysColors.Length]; // array holds corresponding color occurence of sysColor if given picture have pixel the same as sysColor, initialized as 0 for all entries

string sImgPath = @"c:\temp";
string sImgName = "a.jpg"; // given picture for pixel comparison
Bitmap bmp = null;
string rslt = null;
int bmpHeight = 0;
int bmpWidth = 0;
int totalPixel = 0;
string colorDesc = null;
try
{
bmp = new Bitmap(sImgPath + sImgName);
if (!bmp.Size.IsEmpty)
{
bmpHeight = bmp.Size.Height;
bmpWidth = bmp.Size.Width;
totalPixel = bmpHeight * bmpWidth;
}
for (int y=0; y<bmpheight; y++)="" {
="" for="" (int="" x="0;" x<bmpwidth;="" x++)="" color="" y);
="" colordesc="color.ToArgb().ToString();
" i="0;" i<syscolors.length;="" i++)="" if="" (colordesc.equals(syscolors[i]))="" this.colorsumrysrc[i]++;=""
="" break;
="" }="" match
="" check="" it="" is="" of="" its="" type
="" x
="" y
="" catch="" (exception="" e="" )="" rslt="e.Message" +="" "="">>>" + e.StackTrace;
}

Thanks much!!!
Rene Xavier

Re: C# pixel color grouping

Robert Rohde14-Mar-05 18:42

Robert Rohde

14-Mar-05 18:42

If you only want to catgorize into red, green and blue I have a proposal (although I dont know how good it works):
In a reddish color the R value should be higher than the others, in a blueish a blue one should...

This leads to a rather simple if statement:

private void WhatIsIt(Color color) 
{
	if (color.R > color.G)
	{
		if (color.B > color.R)
		{
			Console.WriteLine("Its blue.");
		} 
		else 
		{
			Console.WriteLine("Its red.");
		}
	} 
	else 
	{
		if (color.G > color.B) 
		{
			Console.WriteLine("Its green.");
		} 
		else 
		{
			Console.WriteLine("Its blue.");
		}
	}
}

Re: C# pixel color grouping

Rene Xavier14-Mar-05 19:48

Rene Xavier

14-Mar-05 19:48

Hihi,

Thanks you very much for the reply, but how if I want to classify the colors into Rainbow colors: Red, Orange, Yellow, Green, Olive, Blue, and Violet?

Thanks a ton,
Rene Xavier

Re: C# pixel color grouping

Robert Rohde15-Mar-05 6:24

Robert Rohde

15-Mar-05 6:24

Ok. Define a list with the colors you want.

Whenever you have to categorize a color do the following:
Sum up the differences of the R, G and B values for the color and each color in your list and sum them up.
When done take the color of your list where the difference is the smallest.

Dont know if it works, but you could try Smile | :)

Re: C# pixel color grouping

Rene Xavier15-Mar-05 14:43

Rene Xavier

15-Mar-05 14:43

Thanks much for your advice Rose | [Rose]

I use another approach for specifying the argb ranges for each type of color finally. Blush | :O

Rene Xavier

n-tier application

Blue_Skye14-Mar-05 6:43

Blue_Skye

14-Mar-05 6:43

Umm, i just start to write an n-tier application. I really need an standard n-tier application to check 'n base on it to develop my project. That application doesn't need to be too big, complicated or even a complete project. i just need an application that show clearly about n-tier (urr, maybe one control class for two design from ...).
I really need it. Can anybody help me ?
Thanks!

Re: n-tier application

Ravindra Sadaphule14-Mar-05 13:08

Ravindra Sadaphule

14-Mar-05 13:08

Hi,
he following link on MSDN gives very good examples of N-Tier Application with code samples.
It includes Fitch and Mather 7.0 and Duwamish 7.0

MSDN Enterprise Samples

Cheers

Ravindra Sadaphule
MCSD.NET

Internet Connection!

Amir Jalaly14-Mar-05 6:28

Amir Jalaly

14-Mar-05 6:28

Hi
I want write a program that compute the time of connecting to internet .(like the dial_up connetcion notify icon in windows ) i want the connection property too like connection speed .
can anyone halp me ?

Regards' Amir jalaly

Re: Internet Connection!

i.Posei14-Mar-05 14:23

i.Posei

14-Mar-05 14:23

Use a simple API function InternetGetConnectedState, to return a boolean variable.

using System ;
using System.Runtime ;
using System.Runtime.InteropServices ;
public class InternetCS
{

//Creating the extern function...
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState( out int Description, int ReservedValue ) ;

//Creating a function that uses the API function...
public static bool IsConnectedToInternet( )
{

int Desc ;
return InternetGetConnectedState( out Desc, 0 ) ;

}

}

blank

Deployment Process

sacred_warrior14-Mar-05 6:20

sacred_warrior

14-Mar-05 6:20

We are in a process to create a deployment process (deploy activex controls, com+ dlls, .net dlls). Because we have ~30 servers to install our code to. We are thinking of couple of approaches. I have tested an application that will register all these components on all the servers e.g. use comadmin to register the dlls in COM+ services (remotely), same with the registry files. But how to register activex controls and .net dll that go to COM+ services? Has anybody seen this issue?

Thanks,
sacred_warrior

Why doesnt this work

Esmo200014-Mar-05 5:19

Esmo2000

14-Mar-05 5:19

I have a Windows application and I was doing something that I thought to be very simple. The ONLY change that I made was:

<br />
		/// The main entry point for the application.<br />
		/// </summary><br />
		[STAThread]<br />
		static void Main() <br />
		{<br />
			Form1 someForm = new Form1();<br />
			someForm.Visible = false;<br />
			Application.Run(someForm);<br />
		}<br />

This didnt work. I dont know what I am doing wrong; I would have thought that that was a pretty good way to make it invisble but Im wrong.

Thx,
Jim

Re: Why doesnt this work

tdciDoug14-Mar-05 5:28

tdciDoug

14-Mar-05 5:28

You need to make changes to your form in your onload or constructor...not in the Main.

Have a wonderful evening

Doug Wright
Developer, TDCI

Re: Why doesnt this work

Esmo200014-Mar-05 5:40

Esmo2000

14-Mar-05 5:40

Thanks a lot, but sadly I tried that too with no result Frown | :(

More exactly, this was the code that I used:

<br />
		public Form1()<br />
		{<br />
			this.Visible = false;<br />
			InitializeComponent();<br />
		}<br />

I also tried

<br />
		public Form1()<br />
		{			<br />
			InitializeComponent();<br />
                        this.Visible = false;<br />
		}<br />

Re: Why doesnt this work

Colin Angus Mackay14-Mar-05 6:11

Colin Angus Mackay

14-Mar-05 6:11

What about the Form's Load method? That was the other suggestion, did you try that?

My: Blog | Photos
WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More

Re: Why doesnt this work

mav.northwind14-Mar-05 5:42

mav.northwind

14-Mar-05 5:42

Application.Run(Form f) sets the form's Visible attribute to True internally when it's starting the message loop for the form, so your form gets displayed regardless of what you set Visible to.

To hide the form from the user you can either set its size to (0,0) or move the form off-screen (or both).

Regards,
mav

Re: Why doesnt this work

Esmo200014-Mar-05 5:58

Esmo2000

14-Mar-05 5:58

Thanks, I didnt know about that side effect! This program is going to be run as a scheduled task, how do I go about stopping it from stealing focus?

Thanks a lot,
Jim

Re: Why doesnt this work

mav.northwind14-Mar-05 6:14

mav.northwind

14-Mar-05 6:14

You don't have to show a form for your program to run and perform its tasks.
Take a look at the other Application.Run() overloads, that could be the cleaner solution.

Otherwise you'd have to p/invoke ShowWindow(), there you can specify to show a window without giving it focus.

Regards,
mav

Re: Why doesnt this work

tdciDoug14-Mar-05 7:13

tdciDoug

14-Mar-05 7:13

Good post, I tested this out after posting to him earlier and saw that my suggestion wouldn't help. I was curious as to why it wouldn't hide as well.

Have a wonderful evening

Doug Wright
Developer, TDCI

Re: Why doesnt this work

MoustafaS15-Mar-05 9:43

MoustafaS

15-Mar-05 9:43

why don't u try the this.Hide() in the load constructor

ByMindOnlyYouCanDoIt

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.