Re: Get color value from array - C# Discussion Boards

23-Nov-10 16:49

hello how do i get the color value in an array and append it to a panel showing its actual color as well as display r, g and b color value in a textbox?

JF201523-Nov-10 18:25

JF2015

23-Nov-10 18:25

Hi,

here is the code you wanted. An array of colors and how you can get one single color as background and how you get the value of the single color layer as string.

System.Drawing.Color[] arrColor = new System.Drawing.Color[20];
arrColor[0] = System.Drawing.Color.FromArgb(5, 5, 5);
textBox1.Text = arrColor[0].R.ToString();
panel1.BackColor = arrColor[0];

pancakeleh23-Nov-10 18:31

23-Nov-10 18:31

What is the value stored in my array as this value? [Color[A=255, R=255, G=0, B=0]

Re: Get color value from array [modified]

JF201523-Nov-10 18:37

JF2015

23-Nov-10 18:37

I have no idea what you mean with this question - please show us a bit of your code.

pancakeleh23-Nov-10 18:52

23-Nov-10 18:52

string[] mainColor = listBox10.Items.OfType<object>().Select(item => item.ToString()).ToArray();

I declared this particular array where by it stored many values example( Color[A=255, R= 255, G= 0, B= 0] ) in the listbox.

how to assign the first array to a panel showing the actual color? and RGB number values to textboxes?

modified on Wednesday, November 24, 2010 4:18 AM

Re: Get color value from array [modified]

_Erik_24-Nov-10 3:48

_Erik_

24-Nov-10 3:48

Seeing the questions you have posted here in the last days, I think you have the bad habit of using ToString() method for everything, no matter if it is indeed a string, or a number, or a color, or whatever. If you want an array of colors, why do you declare a string[] array? Which is the type of the items you have in your ListBox? The string you are showing us ( Color[A=255, R= 255, G= 0, B= 0] ) is exactly what an object of Color type returns when you invoke its ToString() method so, how did you add the colors to the ListBox? Did you add the Color objects or did you also invoke ToString method to add them? I mean, if "c" object is a Color object, did you do this:

ListBox.Items.Add(c);

Or did yo do this:

ListBox.Items.Add(c.ToString());

I am asking becouse in both cases you would see the same result in the ListBox. However, in the first case the items are Color objects, so you only have to cast them to Color type:

Color[] colors = listBox10.Items.Cast<Color>().ToArray();

But in the second case the problem is harder becouse you should parse each string. Summarizing, as a piece of advise, use ToString method only when you need a string object.

pancakeleh24-Nov-10 16:11

Re: Get color value from array [modified]

24-Nov-10 16:11

when i use

listBox10.Items.Add(d);

the listbox do not display their color values but just "(Collection)"

my code as shown below"

Dictionary<Color, int> d = new Dictionary<Color, int>();
Color c;
Bitmap checkColor = new Bitmap(pictureBox2.Image);

for (int i = 0; i < checkColor.Width; i++)
{
    for (int j = 0; j < checkColor.Height; j++)
    {
        c = checkColor.GetPixel(i, j);//Get the current pixel.

        if (d.ContainsKey(c))
            d[c]++;
        else
            d.Add(c, 1);
    }
    listBox10.Items.Add(d);
}

I wanted to find the main colors of an image. so i use count colors however unsure of how it shld go abt doing it. any idea?

modified on Wednesday, November 24, 2010 10:31 PM

_Erik_25-Nov-10 4:51

_Erik_

25-Nov-10 4:51

You see "(Collection)" in the listBox becouse there is a little mistake in your program. See this:

Dictionary<Color, int> d = new Dictionary<Color, int>();
// more code...
listBox10.Items.Add(d); // HERE

You are adding the Dictionary object to the listBox, not the Color objects. Remove that line and put this one at the end:

listBox10.Items.AddRange(d.Keys);

However, I don't know how adding the colors to a ListBox could help you. What you want to do is color quantization and, belive me, it is not a trivial task. You need to write an algorithm for clustering the colors. You might consider every color as a point in a three dimensional space, so any three dimensional clustering algorithm would help you for what you need. Once you have the colors clustered, you should only average each cluster and make the replace.

modified on Thursday, November 25, 2010 11:12 AM

What Class(es) to use for Hardware Profiling?

dpminusa23-Nov-10 15:48

23-Nov-10 15:48

What is the best class(es) to use to get the properties of the system your app is running on.

For example:

Total RAM
Video Card
Detailed CPU info
etc.

I have tried some articles but the classes they suggest are either obsolete or incomplete.

Thanks.

"Coding for fun and profit ... mostly fun"

System.Environment[^]

http://www.eggheadcafe.com/tutorials/aspnet/39297eb1-dc9f-49b1-9598-576c706f03cf/c--get-system-memory-in.aspx[^]

Not Active23-Nov-10 15:58

Not Active

23-Nov-10 15:58

I know the language. I've read a book. - _Madmatt

dpminusa23-Nov-10 17:12

23-Nov-10 17:12

Thanks. I did use this. It has some info but is limited on the hardware details.

"Coding for fun and profit ... mostly fun"

Luc Pattyn23-Nov-10 16:25

Luc Pattyn

23-Nov-10 16:25

I use a mix of System.Environment, WMI classes (System.Management), Win32 functions (through P/Invoke), some registry accesses, and some assembly code, and still I'm not getting all I would like to collect.

FWIW: MS guidelines will tell you your app shouldn't be interested nor care. However I understand knowing the characteristics of a platform and logging them can be very relevant in debugging an app with multiple and various customers.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

dpminusa23-Nov-10 17:13

23-Nov-10 17:13

Thanks. Can you provide a little more detail please. Class names, ...

"Coding for fun and profit ... mostly fun"

Luc Pattyn23-Nov-10 17:25

Luc Pattyn

23-Nov-10 17:25

I'm not going to copy dozens of class names, methods, dlls, function names.

If you have a very specific requirement, I'll see what I can provide.

And it wouldn't hurt if you explained a bit why you need those things, the best way may depend on it, as accuracy, performance and prerequisites may vary.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

dpminusa23-Nov-10 17:47

23-Nov-10 17:47

Sorry. I did not realize that would be necessary. Thanks for the guidance. I'll try to take it from here. Smile | :)

"Coding for fun and profit ... mostly fun"

Bernhard Hiller23-Nov-10 23:29

Bernhard Hiller

23-Nov-10 23:29

Luc Pattyn wrote:
knowing the characteristics of a platform and logging them can be very relevant in debugging an app with multiple and various customers

That's terribly true!

dpminusa24-Nov-10 0:16

24-Nov-10 0:16

Precisely. That is one reason I would like to have the techniques in place. I do use an exception capture form and logging system that encourages user input and email responses from the form.

Having a good relevant H/W and S/W profile is very useful. Many users cannot answer/or will not answer questions about there configurations.

I am making some progress on getting more details. I am not happy with it yet. Any ideas on Classes to use and Code snippets are welcome.

Thanks.

"Coding for fun and profit ... mostly fun"

dpminusa23-Nov-10 17:18

23-Nov-10 17:18

I did find this article on using Microsoft.VisualBasic.Devices. Using the VB.NET My Namespace in C# .NET 2.0[^]

I am trying it now. Looks a bit more promising, but only goes so far.

"Coding for fun and profit ... mostly fun"

Jacob D Dixon23-Nov-10 17:53

Jacob D Dixon

23-Nov-10 17:53

Take a look at:
http://msdn.microsoft.com/en-us/library/aa394084(v=VS.85).aspx[^]

Also here is a neat tool:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=2cc30a64-ea15-4661-8da4-55bbc145c30e&displaylang=en[^]

It does work on Windows 7. But you can use it to view the information for the WMI class and decide if that is what you want. It will also generate the code in various languages for you.

As for the pinvoke check out:
http://pinvoke.net/[^]

System.Environment:
http://msdn.microsoft.com/en-us/library/z8te35sa(v=VS.71).aspx[^]

dpminusa23-Nov-10 19:48

23-Nov-10 19:48

Thanks. These all look useful.

The first reference is one I found before. I have not figured out how to create the code to use it yet. Any tips?

The WMI tool will save lots of time as I get in deeper. Pinvoke looks super, but will take some ramp-up to get the value from it.

"Coding for fun and profit ... mostly fun"

Jacob D Dixon24-Nov-10 8:22

Jacob D Dixon

24-Nov-10 8:22

The person below provided a good link. But also with that WMI Creator tool it will show you the code in C# / VB.net or more. You should be able to look at that and tell. If you want to know what a ManagementObject is or a ManagementClass just google it and it you will find Microsofts sample code and information on it.

I did write a blog post a while ago on getting installed applications:
http://jacobddixon.wordpress.com/2010/09/18/c-get-installed-applications-from-remote-computers-with-wmi/[^]

dpminusa24-Nov-10 15:17

24-Nov-10 15:17

Thanks for the reply.

It looks like the following is the key, as you suggest:

using System;
using System.Management;


ManagementClass c = new ManagementClass(
                new ManagementPath("Win32_LogicalDisk"));

PropertyDataCollection properties =
                c.Properties;

...

I can see the WMI code creator is a strong helper as well.

The Help System has an extensive list for "Computer System Hardware Classes" to use with WMI.

This looks like it may have the detail I am looking for.

There are a number of C# classes like DriveInfo, NetworkInterface, ... that may be better choices once you discover them. The WMI is organized so that it may be easier to use.

Poking around on this topic has lead me to more useful namespaces and classes, at least.

Thanks to all for the guidance. Big Grin | :-D

"Coding for fun and profit ... mostly fun"