用C#實現屏幕吸色功能，附邏輯思維講解圖，功能代碼不超過50行即可實現

主要實現思路是：

一、創建一個畫布（即爲Form），大小和當前屏幕大小一樣

二、在這快畫布上建立一個繪圖對象，截取複製當前屏幕內容

三、用Image對象的GetThumbnailImage方法獲取鼠標座標點的方圓20像素的圖像，然後以縮略圖的形式將其放大，實現放大鏡效果

四、利用API獲取當前鼠標座標點的像素色

五、吸色顯示信息窗體實時跟蹤

六、方向鍵微調功能，直接調用WIN的API設置鼠標座標即可

 

先來看下吸引效果：

控件佈局：

實時跟蹤窗體顯示模式的邏輯思維圖：

始終保持吸色信息窗體保持上圖所示狀態（左上，右上，左下，右下），我的實現代碼是這樣寫的：

Point p = new Point();
            p.X = MousePosition.X+10;
            p.Y = MousePosition.Y+10;

            Size s = Screen.PrimaryScreen.Bounds.Size;

            if (p.X > s.Width - this.Width)
                p.X -= this.Width + 20;
            if (p.Y > s.Height - this.Height)
                p.Y -= this.Height + 20;

            this.Location = p;

 

好了，下面附上我的全部代碼：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace LR.Tools
{
    ///<summary>     /// LR.Tools 的摘要說明     /// 程序: LR.Tools V1.0版     /// Developer: 狼人     /// QQ:459094521  博客: http://www.cnblogs.com/waw/     /// 編寫時間: 2009-01-15     ///<summary> 
    public partial class WinEatColor : LR.Tools.MasterForm
    {
        Form f = new Form();
        public WinEatColor()
        {
            f.FormBorderStyle = FormBorderStyle.None;//無邊框             f.Cursor = System.Windows.Forms.Cursors.Cross;
            f.WindowState = FormWindowState.Maximized;
            f.Opacity = 0.01;
            f.ShowInTaskbar = false;
            f.Show();

            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            //鼠標的座標             this.label1.Text = "鼠標座標："+MousePosition.X+","+MousePosition.Y;
            //顯示句柄             this.label3.Text = "句柄：" + LR.Win32API.WindowAPI.WindowFromPoint(MousePosition);
            //當前窗體自動跟隨鼠標             this.MoveForm();
            //利用API獲取當前鼠標座標點的像素色             Color c = LR.Win32API.WindowAPI.GetColorOfScreen(MousePosition);
            //顯示在網頁中顯示的編碼             this.textBox1.Text = "#"+c.Name.ToUpper().Substring(2);
            //顯示RGB三位色             this.txt_RGB.Text = c.R.ToString() + "," + c.G.ToString() + "," + c.B.ToString();
            //設置label的顏色             this.label6.BackColor = c;
            //顯示放大鏡             this.ShowPictureBox(MousePosition);
        }

        void ShowPictureBox(Point p)
        {
            //創建一個畫布大小和當前屏幕大小一樣             Bitmap bmp = new Bitmap(20,20);
            //在這快畫布上建立一個繪圖對象             Graphics g = Graphics.FromImage(bmp);
            //截取複製當前屏幕內容             g.CopyFromScreen(p.X-10, p.Y-10, 0,0, bmp.Size);
            //以縮略圖的形式就放大鏡             Image pThumbnail = bmp.GetThumbnailImage(this.pictureBox1.Width, this.pictureBox1.Height, null, new IntPtr());
            //畫放大圖             g.DrawImage(bmp, 10, 10, pThumbnail.Width, pThumbnail.Height);
            g.Dispose();

            this.pictureBox1.Image = pThumbnail;
            g = Graphics.FromImage(this.pictureBox1.Image);
            g.DrawRectangle(Pens.Black, this.pictureBox1.Width / 2 - 5, this.pictureBox1.Height / 2 - 5, 10, 10);
            g.Dispose();
        }

        void MoveForm()
        {
            Point p = new Point();
            p.X = MousePosition.X+10;
            p.Y = MousePosition.Y+10;

            Size s = Screen.PrimaryScreen.Bounds.Size;

            if (p.X > s.Width - this.Width)
                p.X -= this.Width + 20;
            if (p.Y > s.Height - this.Height)
                p.Y -= this.Height + 20;

            this.Location = p;
        }

        private void WinEatColor_Load(object sender, EventArgs e)
        {
        }

        private void WinEatColor_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
                this.timer1.Stop();

            Point pCur = MousePosition;
            //方向鍵微調             if (e.KeyCode == Keys.Up)
                LR.Win32API.WindowAPI.SetCursorPos(pCur.X, pCur.Y - 1);
            if (e.KeyCode == Keys.Left)
                LR.Win32API.WindowAPI.SetCursorPos(pCur.X - 1, pCur.Y);
            if (e.KeyCode == Keys.Right)
                LR.Win32API.WindowAPI.SetCursorPos(pCur.X + 1, pCur.Y);
            if (e.KeyCode == Keys.Down)
                LR.Win32API.WindowAPI.SetCursorPos(pCur.X, pCur.Y + 1);
        }

        private void WinEatColor_Deactivate(object sender, EventArgs e)
        {
            this.timer1.Stop();
        }

        //重拾         private void button1_Click(object sender, EventArgs e)
        {
            this.timer1.Start();
        }

        private void textBox1_MouseEnter(object sender, EventArgs e)
        {
            this.textBox1.Focus();
            this.textBox1.SelectAll();
            this.textBox1.Copy();
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            LR.Win32API.WindowAPI.MouseMoveWindow(this.Handle);
        }

        private void WinEatColor_FormClosed(object sender, FormClosedEventArgs e)
        {
            f.Close();
        }
    }
}