求取色器的思路

建立一个和屏幕一样大的Bitmap.
然后用Graphics.CopyFromScreen把屏幕拷贝上去.
接下来要取位于(x,y)的颜色就很简单了.
直接调用Bitmap.GetPixel (x,y);

GetPixel: 获取某一个点的颜色。
BitBlt: 获取屏幕上一块区域的截图。

直接给你代码把
使用timer来做..
     private void timer1_Tick(object sender, EventArgs e)
        {
            POINT _Point = new POINT();            GetCursorPos(ref _Point);            IntPtr _Hwnd = WindowFromPoint((uint)_Point.x, (uint)_Point.y);            IntPtr _DC = GetDC(_Hwnd);
            ScreenToClient(_Hwnd, ref _Point);
            uint _ColorLong = GetPixel(_DC, _Point.x, _Point.y);
            Color _Color = Color.FromArgb((int)_ColorLong & 0xFF, (int)(_ColorLong & 0xFF00) / 256, (int)(_ColorLong & 0xFF0000) / 65536);
            ReleaseDC(_Hwnd, _DC);
            this.BackColor = _Color;
        }        [DllImport("user32.dll")]
        public static extern IntPtr WindowFromPoint(uint x_point, uint y_point);        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr GetDC(IntPtr hWnd);        [DllImport("user32.dll")]
        public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p_Point);        [DllImport("gdi32.dll")]
        public static extern uint GetPixel(IntPtr hDC, int XPos, int YPos);        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);        [DllImport("user32.dll")]
        public static extern bool GetCursorPos(ref POINT p_Point);        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x;
            public int y;
        }

我写过一个，下载地址：http://download.csdn.net/source/833068

汗...
那个方法已经可以屏幕取任意地方的颜色了.
你再加个timer结合Cursor.Position就能
用鼠标随时取屏幕任何地方的颜色了.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Resources;
using System.Reflection;namespace GetColor
{
    public partial class Form1 : Form
    {
        private Bitmap bitmap;

        public Form1()
        {
            InitializeComponent();
        }        private void GetColor()
        {
            Point mouseP = Cursor.Position;
            Screen screen = Screen.PrimaryScreen;
            if (bitmap == null)
                bitmap = new Bitmap(screen.Bounds.Width, screen.Bounds.Height);
            Graphics g = Graphics.FromImage(bitmap);
            g.CopyFromScreen(Point.Empty, Point.Empty, screen.Bounds.Size);
            g.DrawImage(bitmap, Point.Empty);
            Color c = bitmap.GetPixel(mouseP.X, mouseP.Y);
            string currColor = Convert.ToString(ColorTranslator.ToHtml(c));
            txtColor.BackColor = c;
            txtRGB.Text = Convert.ToString(ColorTranslator.ToHtml(c));        }        private void stopGetColor()
        {
            timer1.Stop();
            GetColor();
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            GetColor();
        }        private void Form1_Load(object sender, EventArgs e)
        {

        }        private void btnOK_Click(object sender, EventArgs e)
        {
            timer1.Start();
            btnOK.Enabled = false;
        }
    }
}可以取色了就是不知道如何停止取色想双击鼠标停止取色，可是双击事件只是在窗体上双击才有效，在窗体外部不可以呀。。这个该怎么弄呀？

上面代码没写完。本来添加了一个鼠标双击时间，在里边写进去了stopGetColor(),可是不奏效

int mouseX = e.X;
int mouseY = e.Y;
     Color pixelColor = myBitmap.GetPixel(mouseX, mouseY);
     colorbox.BackColor = pixelColor;

参考

调试易

求取色器的思路

解决方案 »