简单的屏幕取色器

来源：互联网发布：c语言判断质数的程序编辑：程序博客网时间：2024/05/29 14:41
运行效果截图：
后台代码：
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 ColorPicker{    public partial class ColorPickerSimple : Form    {        #region 引入外部方法        //GetDC，获取DC（设备环境）        [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]        private static extern int GetDC(int hwnd);        //GetPixel，获取像素点        [DllImport("gdi32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]        private static extern int GetPixel(int hdc, int X, int y);        //ReleaseDC，释放DC        [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)] //确定坐标        private static extern int ReleaseDC(int hwnd, int hdc);        #endregion        #region 字段        //R、G、B        int blue;        int green;        int red;        //指定设备环境（句柄为0则为桌面）        int hD;        //颜色信息        int c;        //鼠标所在处坐标点        int a;        int b;        #endregion        public ColorPickerSimple()        {            InitializeComponent();        }        #region 窗体事件        /// <summary>        /// 窗体加载        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void ColorPickerSimple_Load(object sender, EventArgs e)        {            txtR.ReadOnly = true;            txtG.ReadOnly = true;            txtB.ReadOnly = true;            txtColor.ReadOnly = true;            timer1.Enabled = true;        }        #endregion        #region 获取颜色        /// <summary>        /// Timer事件        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void timer1_Tick(object sender, EventArgs e)        {            //获取鼠标所在处的坐标            a = System.Windows.Forms.Control.MousePosition.X;            b = System.Windows.Forms.Control.MousePosition.Y;            //获取DC，设备环境（桌面）            hD = GetDC(0);            //获取颜色值            c = GetPixel(hD, a, b);            //释放DC            ReleaseDC(0, hD);            //由颜色值计算R、G、B值            red = c % 256;            green = (c / 256) % 256;            blue = (c / 256 / 256) % 256;            //显示颜色分值            txtR.Text = Convert.ToString(red);            txtG.Text = Convert.ToString(green);            txtB.Text = Convert.ToString(blue);            //显示拾取的颜色            Color color = Color.FromArgb(red, green, blue);            txtColor.BackColor = color;        }        #endregion    }}