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

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);
        }
    }
}

 

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