场景

效果

 

实现

关键代码

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();}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);}} }

程序与代码下载

公众号“霸道的程序猿”发送“颜色拾取器”

 

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