Winform中实现颜色拾取器获取RGB与16进制颜色程序与源码分享

素颜马尾好姑娘i 2023-10-07 05:23 53阅读 0赞

## 场景 ##

### 效果 ###

![20200312102248469.gif][]

## 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”

[20200312102248469.gif]: https://img-blog.csdnimg.cn/20200312102248469.gif