場景

效果

註：

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https://blog.csdn.net/badao_liumang_qizhi
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霸道的程式猿
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實現

新建一個窗體頁面，設計佈局如下

頁面上添加一個Timer

然後修改此頁面代碼

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.Runtime.InteropServices;
namespace GetColor
{
    public partial class FrmGetColor : Form
    {
        public FrmGetColor()
        {
            InitializeComponent();
        }

        #region 定義快捷鍵
        //如果函數執行成功，返回值不為0。       
        //如果函數執行失敗，返回值為0。要得到擴展錯誤信息，調用GetLastError。        
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RegisterHotKey(
        IntPtr hWnd,                //要定義熱鍵的視窗的句柄            
        int id,                     //定義熱鍵ID（不能與其它ID重覆）                       
        KeyModifiers fsModifiers,   //標識熱鍵是否在按Alt、Ctrl、Shift、Windows等鍵時才會生效         
        Keys vk                     //定義熱鍵的內容            
    );
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnregisterHotKey(
            IntPtr hWnd,                //要取消熱鍵的視窗的句柄            
            int id                      //要取消熱鍵的ID            
        );
        //定義了輔助鍵的名稱（將數字轉變為字元以便於記憶，也可去除此枚舉而直接使用數值）        
        [Flags()]
        public enum KeyModifiers
        {
            None = 0,
            Alt = 1,
            Ctrl = 2,
            Shift = 4,
            WindowsKey = 8
        }
        #endregion

 

          [DllImport("gdi32.dll")]   
          static public extern uint GetPixel(IntPtr hDC,int XPos,int YPos);   
          [DllImport("gdi32.dll")]   
          static public extern  IntPtr CreateDC(string driverName,string deviceName,string output,IntPtr lpinitData);   
          [DllImport("gdi32.dll")]   
          static public extern bool DeleteDC(IntPtr DC);   
          static public byte GetRValue(uint color)   
          {   
              return (byte)color;   
          }   
          static public byte GetGValue(uint color)   
          {   
              return ((byte)(((short)(color))>>8));   
          }    
          static public byte GetBValue(uint color)   
          {   
             return ((byte)((color)>>16));   
          }    
          static public byte GetAValue(uint color)   
          {   
             return ((byte)((color)>>24));   
          }    
          public Color GetColor(Point screenPoint)   
          {   
              IntPtr displayDC = CreateDC("DISPLAY",null,null,IntPtr.Zero);   
              uint   colorref   =   GetPixel(displayDC,screenPoint.X,screenPoint.Y);   
              DeleteDC(displayDC);   
              byte   Red   =   GetRValue(colorref);   
              byte   Green   =   GetGValue(colorref);   
              byte   Blue   =   GetBValue(colorref);   
              return Color.FromArgb(Red,   Green,   Blue);   
          }  

        private void FrmGetColor_Load(object sender, EventArgs e)
        {
            this.TopMost = true;
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked == true)
            {
                this.TopMost = true;
            }
            else
            {
                this.TopMost = false;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            txtPoint.Text=Control.MousePosition.X.ToString()+","+Control.MousePosition.Y.ToString();
            Point pt = new Point(Control.MousePosition.X, Control.MousePosition.Y);
            Color cl = GetColor(pt);
            panel1.BackColor = cl;
            txtRGB.Text = cl.R + "," + cl.G + "," + cl.B;
            txtColor.Text = ColorTranslator.ToHtml(cl).ToString();
            RegisterHotKey(Handle, 81, KeyModifiers.Ctrl, Keys.F);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            AboutBox1 ab = new AboutBox1();
            ab.ShowDialog();
        }

        private void label3_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process.Start("http://www.mrbccd.com");
        }
        protected override void WndProc(ref Message m)
        {
            const int WM_HOTKEY = 0x0312;
            //按快捷鍵     
            switch (m.Msg)
            {
                case WM_HOTKEY:
                    switch (m.WParam.ToInt32())
                    {
                        case 81:    //按下的是CTRL+F     
                            Clipboard.SetText(txtColor.Text.Trim());
                            break;
                    }
                    break;
            }
            base.WndProc(ref m);
        }

        private void FrmGetColor_Leave(object sender, EventArgs e)
        {

        }

        private void FrmGetColor_FormClosed(object sender, FormClosedEventArgs e)
        {
            //註銷Id號為81的熱鍵設定    
            UnregisterHotKey(Handle, 81);
        }
    }
}

代碼下載

https://download.csdn.net/download/BADAO_LIUMANG_QIZHI/12243099