Proper way to determine the colors of controls? - C# Discussion Boards

How validate c# DataGridView Cell to accept only Alphabet characters upper, lower and Numeric

5-Jan-10 6:09

Wheels012 wrote:
Still get same error when I capitalize appDomain. WHEELS

Still wrong. There are 2 letters to capatilaze: "AppDomain"

OutlookAddin

Md. Marufuzzaman5-Jan-10 1:31

Md. Marufuzzaman

5-Jan-10 1:31

Hello All…
Hope all is well with you..

Actually I want to write a OutlookAddin it will add a simple dropdown combo box after the subject input area.... Can anyone give me some guideline..Please note that a have done this but the problem is it load at the end of the form.

Thanks
Md. Marufuzzaman

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Member 11161155-Jan-10 0:33

Member 1116115

5-Jan-10 0:33

it is a windows application
I want to validate the datagridview cell ,it has to accepct only alphabets and numerics

HFGHFGHFGHFGHFHFHFHFHFHFHFHFHF

Faster

sanforjackass5-Jan-10 0:28

sanforjackass

5-Jan-10 0:28

i have program that search for white point in screen, the code is:

namespace CameraLab
{
public class CamManeger
{

Point pp;

public Point PP
{
get
{
return pp;
}

set
{
pp = value;
}
}

[DllImport("user32.dll")]
public static extern void mouse_event(MouseEventType dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

[DllImport("user32")]
public static extern int SetCursorPos(int x, int y);

public enum MouseEventType : int
{
LeftDown = 0x02,
LeftUp = 0x04,
RightDown = 0x08,
RightUp = 0x10
}

public void test(Bitmap bm, int X, int Y, int x, int y ,Point pp,bool L)
{
bool z = false;

for (int i = X; i < x; i++)
{
for (int j = Y; j < y; j++)
{
if (bm.GetPixel(i, j).R == 255 && bm.GetPixel(i, j).G == 255 && bm.GetPixel(i, j).B == 255 && bm.GetPixel(i, j).R == 255)
{
Point p = new Point(Screen.PrimaryScreen.WorkingArea.Width - i, Screen.PrimaryScreen.WorkingArea.Height - j);
Cursor.Position = p;
this.PP = p;

z = true;
break;
}
}
if (z == true)
{
break;
}
}
}
}
}

can i make this code more faster.

Re: Faster [modified]

Saksida Bojan5-Jan-10 2:01

Proper way to determine the colors of controls?

5-Jan-10 2:01

Edit your code and add <pre> tags, because i can very hardly to read

The only thing you could improve (as i see), modify your if statement. But you won't get performance boost

if (bm.GetPixel(i, j) == Color.White)
{
}

Maybe you shoud look into directly into unmanaged GDI. (GDI+ is only a wraper around unmanaged GDI)

Edit: Styleing

modified on Tuesday, January 5, 2010 10:59 AM

Re: Faster

Rob Philpott5-Jan-10 2:12

Rob Philpott

5-Jan-10 2:12

GetPixel is seriously slow. Take a look at this article:

ImageTraverser[^]

Regards,
Rob Philpott.

Re: Faster

harold aptroot5-Jan-10 3:32

harold aptroot

5-Jan-10 3:32

Is that for an aimbot?

arnold_w5-Jan-10 0:20

Re: Proper way to determine the colors of controls?

5-Jan-10 0:20

Sometimes I need to determine the color of different controls. I give a couple a of examples. In a MessageBox I needed a custom made gif-icon and I wanted the background color of the icon to match the color of the MessageBox itself. In another project I wanted to get rid of the little sort-array in the header of a DataGridView and to do that I had to override the Paint-method and paint the arrow with the background color. To determine the colors in these two examples I did a print screen and pasted the screen dump into Paint and used the color picker to get the RGB-values. This works fine on most computer, but I have noticed that on some computers (depending on operating system and other things) the gray color is not the same as on my computer. Something tells me there must be a way to query the color to use instead of determining it by hand and then hardcoding it. How do I do this?

petercrab5-Jan-10 0:32

petercrab

5-Jan-10 0:32

Gif supports transparency, can't you make the background transparent in your gif images? Would this do what you need?

Re: Proper way to determine the colors of controls?

arnold_w5-Jan-10 0:36

Re: Proper way to determine the colors of controls?

5-Jan-10 0:36

Well, in the specific case with a gif-icon I could use transparency. However, I would still like to know how I can determine the color programmatically.

Saksida Bojan5-Jan-10 1:54

Re: Proper way to determine the colors of controls?

5-Jan-10 1:54

you could atempt use the folowing

Bitmap bmp;
// <snip>intelizing bmp

if (bmp.GetPixel(x,y) == Color.White) // Color has predefined colors. SystemColor has a system setting colors as predefind
{
}

arnold_w5-Jan-10 2:56

Re: Proper way to determine the colors of controls? [modified]

5-Jan-10 2:56

I don't understand how to use this. Can you please give an example how I can use it when I override the Paint-method for DataGridViewColumnHeaderCell:

protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates dataGridViewElementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)

Saksida Bojan5-Jan-10 4:51

Re: Proper way to determine the colors of controls?

5-Jan-10 4:51

I actually don't remember Paint method has this many parameters. I assume you are inherited from DataGridView

The method I posted was intended from thread above yours. I posted in wrong but I left it because you asked a question in that post that could be correct answer.
It is better to get color from propties instead atempt to read from a point on the screan

DataGridView background color is default to SystemColors.AppWorkspace.

So I suggest you use to get your background color:

this.BackgroundColor

modified on Tuesday, January 5, 2010 10:57 AM

Saksida Bojan5-Jan-10 1:56

Re: Proper way to determine the colors of controls?

5-Jan-10 1:56

arnold_w wrote:
This works fine on most computer, but I have noticed that on some computers (depending on operating system and other things) the gray color is not the same as on my computer.

That could be cousing also by monitors. Some have Color temperature (or even named as Color Tone) setting

arnold_w5-Jan-10 2:04

Re: Proper way to determine the colors of controls?

5-Jan-10 2:04

What I mean is that my DataGridView (in the example above) can look perfect (meaing the arrow is not visible because it has been filled with the correct backgound color) on my computer, but on another computer the arrow is visible, appearing with a slightly different shade of gray. Thus, for some reason the DataGridView is not the same color on all computers, but the arrow I drew has the same color because I hard-coded it. I am therefore confident that this is not a monitor issue.

Saksida Bojan5-Jan-10 4:41

Re: Proper way to determine the colors of controls?

5-Jan-10 4:41

arnold_w wrote:
Thus, for some reason the DataGridView is not the same color on all computers, but the arrow I drew has the same color because I hard-coded it.

So other background is not hardcoded
if you use static prop ties of class Color (Color.White or Color.Blue). Those colors are hard coded. However class SystemColor has also static proprties, (SystemColor.Window or SystemColor.Control) those properties are system specific tied to color schemes used by windows. These color schemes can be easily changed

arnold_w5-Jan-10 21:30

5-Jan-10 21:30

SystemColor seems to be exactly what I was looking for. A big thank you for your help!

Add-in is not executing.

SRKSHOME4-Jan-10 23:24

SRKSHOME

4-Jan-10 23:24

Hi,
I have developed a .net COM automation add-in which includes a UDF and registered using RegAsm.But whenever i tried to execute this UDF in Excel, it is coming as !REF in a cell.

Any idea how to make it working?

c# windows application

naghoumeh144-Jan-10 22:52

naghoumeh14

4-Jan-10 22:52

i would like to know if anyone can help me to construct a window application to make a small MCQ (multiple chooice question) game.. i have to do this project for university and i don't know where or how to start.... plz help.. we need to use an XML file and to pick questions randomly from this file and we have to put the 4 possibilities randomly in 4 buttons and the user will then pick the answer .. so help me if you can

OriginalGriff4-Jan-10 23:08

OriginalGriff

4-Jan-10 23:08

You need to do several things:
1) Create your XMl file full of questions, and four answers per question.
2) Look at XMLReader in the documentation
3) Look at Random in the documentation.

XMLReader isn't difficult: the simplest case is:

XmlTextReader xmlReader = new XmlTextReader("questions.xml");
Console.WriteLine(xmlReader.AttributeCount);
while(xmlReader.Read())
   {
   Console.WriteLine(xmlReader.Value);
   }

It can do loads more than that, but it's a start.

Random is also easy:

Random rnd = new Random;
for (int i = 0; i < 10; i++)
   {
   Console.WriteLine(rnd.Next(4));
   }

Will print 10 random numbers between 0 and 3 inclusive.

All those who believe in psycho kinesis, raise my hand.

naghoumeh144-Jan-10 23:21

naghoumeh14

4-Jan-10 23:21

thank you vey much... but there's something i want to know about... let's suppose i wrote my xml file containing 100 questions so i have to pick randomly 5 questions... what should i do to be sure that the same question isn't going to be repeated twice?

OriginalGriff4-Jan-10 23:38

OriginalGriff

4-Jan-10 23:38

You will need to keep a record of which questions have been picked allready, and generate a new random number. Or (more advanced):
When you read in your XML file, create a class that holds a question, and its possible answers. Store all these questions in a List<myClass> (which is easy)

List<myClass> questions = new List<myClass>;
myClass question = new myClass(ReadQuestionFromXML());
questions.Add(question);

Now when you want a new question, use Random with the number of questions left as the upper limit, then remove the question from the list and display it.

This is difficult to explain, as I don't want to give you the answer - you won't learn anything if I do - but it honestly is not as difficult as you think! Just do it in stages:

Create the XML
Read the XML
Create the list
Use the list.

You can probably also break each of these stages down into smaller tasks, and implement them and test before moving on to the next.

All those who believe in psycho kinesis, raise my hand.

naghoumeh144-Jan-10 23:46

naghoumeh14

4-Jan-10 23:46

okay i'm starting to get.. so all i have to do is to work in small steps... i really want to thank you for helping me ...so i'll start my program and if i have any question i will be thankfull if you could anwser me..
nagham

OriginalGriff5-Jan-10 0:00

OriginalGriff

5-Jan-10 0:00

Yes, thats the idea - do it in small steps!
I'll answer if I can - and so will everyone else. Laugh | :laugh:

All those who believe in psycho kinesis, raise my hand.