获取屏幕上某一位置像素的颜色

using System.Runtime.InteropServices;

 

  ///
        /// 获取指定窗口的设备场景
        ///
        /// 将获取其设备场景的窗口的句柄。若为0，则要获取整个屏幕的DC
        /// 指定窗口的设备场景句柄，出错则为0
        [DllImport("user32.dll")]
        public static extern IntPtr GetDC(IntPtr hwnd);

        ///
        /// 释放由调用GetDC函数获取的指定设备场景
        ///
        /// 要释放的设备场景相关的窗口句柄
        /// 要释放的设备场景句柄
        /// 执行成功为1，否则为0
        [DllImport("user32.dll")]
        public static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

        ///
        /// 在指定的设备场景中取得一个像素的RGB值
        ///
        /// 一个设备场景的句柄
        /// 逻辑坐标中要检查的横坐标
        /// 逻辑坐标中要检查的纵坐标
        /// 指定点的颜色
        [DllImport("gdi32.dll")]
        public static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

        public Color GetColor(int x, int y)
        {
            IntPtr hdc = GetDC(IntPtr.Zero); uint pixel = GetPixel(hdc, x, y);
            ReleaseDC(IntPtr.Zero, hdc);
            Color color = Color.FromArgb((int)(pixel & 0x000000FF), (int)(pixel & 0x0000FF00) >> 8, (int)(pixel & 0x00FF0000) >> 16);
            return color;
        }

 

  private void timer1_Tick(object sender, EventArgs e)
        {
            textBox1.Text = MousePosition.X.ToString();            //鼠标当前位置的X坐标值
            textBox2.Text = MousePosition.Y.ToString(); //鼠标当前位置的Y坐标值
            label1.Text = GetColor(MousePosition.X, MousePosition.Y).ToString();

        }