C#版本的取色器

【实例简介】

C#开发的取色器
【实例截图】

【核心代码】

   public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        [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 Form1_Load(object sender, EventArgs e)
        {

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            Point pt = new Point(Control.MousePosition.X, Control.MousePosition.Y);
            Color cl = GetColor(pt);
            panel1.BackColor = cl;
        }
    }