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 定义快捷键//如果函数执行成功，返回值不为0。       //如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。        [DllImport("user32.dll", SetLastError = true)]public static extern bool RegisterHotKey(
        IntPtr hWnd,                //要定义热键的窗口的句柄            int id,                     //定义热键ID（不能与其它ID重复）                       KeyModifiers fsModifiers,   //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效         Keys vk                     //定义热键的内容                );
        [DllImport("user32.dll", SetLastError = true)]public static extern bool UnregisterHotKey(
            IntPtr hWnd,                //要取消热键的窗口的句柄            int id                      //要取消热键的ID                    );//定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）                [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;//按快捷键     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)
        {//注销Id号为81的热键设定    UnregisterHotKey(Handle, 81);
        }
    }
}