【C#】[取色]取屏幕指定点颜色(Api)

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 取指定点颜色
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("user32.dll")]//取设备场景
        private static extern IntPtr GetDC(IntPtr hwnd);//返回设备场景句柄
        [DllImport("gdi32.dll")]//取指定点颜色
        private static extern int GetPixel(IntPtr hdc, Point p);


        private void timer1_Tick(object sender, EventArgs e)
        {
            Point p = new Point(MousePosition.X, MousePosition.Y);//取置顶点坐标
            textBox_p.Text = p.X + "," + p.Y;//把坐标显示到窗口上
            IntPtr hdc = GetDC(new IntPtr(0));//取到设备场景(0就是全屏的设备场景)
            int c = GetPixel(hdc, p);//取指定点颜色
            int r = (c & 0xFF);//转换R
            int g = (c & 0xFF00) / 256;//转换G
            int b = (c & 0xFF0000) / 65536;//转换B
            textBox_10jz.Text = c.ToString();//输出10进制颜色
            textBox_16jz.Text = r.ToString("x").PadLeft(2, '0') + g.ToString("x").PadLeft(2, '0') + b.ToString("x").PadLeft(2, '0');//输出16进制颜色
            textBox_RGB.Text = r.ToString() + ',' + g.ToString() + ',' + b.ToString();//输出RGB
            pictureBox_color.BackColor = Color.FromArgb(r,g,b);//设置颜色框
        }


    }
}