Как считать Цвет Экранного Пикселя

Please check this two different functions I have used in one of my previous projects :

1) This function takes snapshot of Desktop

private void CaptureScreenAndSave(string strSavePath)
        {

            //SetTitle("Capturing Screen...");

            Bitmap bmpScreenshot;

            Graphics gfxScreenshot;
            bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height,System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            gfxScreenshot = Graphics.FromImage(bmpScreenshot);
            gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
            MemoryStream msIn = new MemoryStream();
            bmpScreenshot.Save(msIn, System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders()[0], null);

            msIn.Close();

            byte[] buf = msIn.ToArray();

            MemoryStream msOut = new MemoryStream();

            msOut.Write(buf, 0, buf.Length);

            msOut.Position = 0;

            Bitmap bmpOut = new Bitmap(msOut);

            try
            {
                bmpOut.Save(strSavePath, System.Drawing.Imaging.ImageFormat.Bmp);
                //SetTitle("Capturing Screen Image Saved...");
            }

            catch (Exception exp)
            {

            }

            finally
            {
                msOut.Close();
            }
        }

2) This function takes an image in input and calculates RGB average of pixel range given.

double GetRGBAverageForPixelRange( int istartRange, int iEndRange,  Bitmap oBitmap )
        {
            double dRetnVal = 0 ;
            Color oTempColor ; 
            int i, j ;
            for( int iCounter = istartRange ; iCounter < iEndRange ; iCounter++ )
            {
                i = (iCounter % (oBitmap.Width));
                j = ( iCounter / ( oBitmap.Width ) ) ;
                if (i >= 0 && j >= 0 && i < oBitmap.Width && j < oBitmap.Height )
                {
                    oTempColor = oBitmap.GetPixel(i, j);
                    dRetnVal = dRetnVal + oTempColor.ToArgb();
                }

            }
            return dRetnVal ;
        }

This two functions together might solve your problem. Happy Coding :)

EDIT : Please note that GetPixel is very slow function. I will think twice befor using it.

This is the most efficient: It grabs a pixel at the location of the cursor, and doesn't rely on only having one monitor.

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Diagnostics;

namespace FormTest
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        static extern bool GetCursorPos(ref Point lpPoint);

        [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
        public static extern int BitBlt(IntPtr hDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);

        public Form1()
        {
            InitializeComponent();
        }

        private void MouseMoveTimer_Tick(object sender, EventArgs e)
        {
            Point cursor = new Point();
            GetCursorPos(ref cursor);

            var c = GetColorAt(cursor);
            this.BackColor = c;

            if (c.R == c.G && c.G < 64 && c.B > 128)
            {
                MessageBox.Show("Blue");
            }
        }

        Bitmap screenPixel = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
        public Color GetColorAt(Point location)
        {
            using (Graphics gdest = Graphics.FromImage(screenPixel))
            {
                using (Graphics gsrc = Graphics.FromHwnd(IntPtr.Zero))
                {
                    IntPtr hSrcDC = gsrc.GetHdc();
                    IntPtr hDC = gdest.GetHdc();
                    int retval = BitBlt(hDC, 0, 0, 1, 1, hSrcDC, location.X, location.Y, (int)CopyPixelOperation.SourceCopy);
                    gdest.ReleaseHdc();
                    gsrc.ReleaseHdc();
                }
            }

            return screenPixel.GetPixel(0, 0);
        }
    }
}

Now, obviously, you don't have to use the cursor's current location, but this is the general idea.

EDIT:

Given the above GetColorAt function you can poll a certain pixel on the screen in a safe, performance friendly way like this:

private void PollPixel(Point location, Color color)
{
    while(true)
    {
        var c = GetColorAt(location);

        if (c.R == color.R && c.G == color.G && c.B == color.B)
        {
            DoAction();
            return;
        }

        // By calling Thread.Sleep() without a parameter, we are signaling to the
        // operating system that we only want to sleep long enough for other
        // applications.  As soon as the other apps yield their CPU time, we will
        // regain control.
        Thread.Sleep()
    }
}

You can wrap that in a Thread if you want, or execute it from a Console application. "Whatever suits your fancy," I guess.

Насколько я знаю, самый простой способ сделать это:

1. сделать снимок экрана
2. посмотреть на растровое изображение и получить цвет пикселя

Изменить

Там вероятно, невозможно "подождать", пока пиксель не изменится на определенный цвет. Вашей программе, вероятно, придется просто зацикливаться и проверять ее время от времени, пока она не увидит цвет.

Например:

while(!IsPixelColor(x, y, color))
{
    //probably best to add a sleep here so your program doesn't use too much CPU
}
DoAction();

РЕДАКТИРОВАТЬ 2

Вот пример кода, который вы можете изменить. Этот код просто меняет цвет метки в зависимости от текущего цвета в данном пикселе. Этот код позволяет избежать упомянутой утечки дескрипторов.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{

    [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
    public static extern int BitBlt(IntPtr hDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);


    Thread t;
    int x, y;

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        x = 20;
        y = 50;
        t = new Thread(update);
        t.Start();
    }

    private void update()
    {
        Bitmap screenCopy = new Bitmap(1, 1);
        using (Graphics gdest = Graphics.FromImage(screenCopy))
        {
            while (true)
            {
                //g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(256, 256));
                using (Graphics gsrc = Graphics.FromHwnd(IntPtr.Zero))
                {
                    IntPtr hSrcDC = gsrc.GetHdc();
                    IntPtr hDC = gdest.GetHdc();
                    int retval = BitBlt(hDC, 0, 0, 1, 1, hSrcDC, x, y, (int)CopyPixelOperation.SourceCopy);
                    gdest.ReleaseHdc();
                    gsrc.ReleaseHdc();
                }
                Color c = Color.FromArgb(screenCopy.GetPixel(0, 0).ToArgb());
                label1.ForeColor = c;
            }
        }
    }
}

}