生成验证码

来源：互联网发布：python pyperclip 编辑：程序博客网时间：2024/06/06 12:37
using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.IO;using System.Web.UI;namespace WebStringToPicture{    public partial class Index : Page    {        protected void Page_Load(object sender, EventArgs e)        {            string str = "aasdfghjlk";            CreateCheckCodeImage(str);        }        private void CreateCheckCodeImage(string checkCode)        {            if (checkCode == null || checkCode.Trim() == String.Empty)                return;            var image = new Bitmap((int) Math.Ceiling((checkCode.Length*12.5)), 22);            Graphics g = Graphics.FromImage(image);            try            {                //生成随机生成器                var random = new Random();                //清空图片背景色                g.Clear(Color.White);                //画图片的背景噪音线只有一条                for (int i = 0; i < 2; i++)                {                    int x1 = random.Next(image.Width);                    int x2 = random.Next(image.Width);                    int y1 = random.Next(image.Height);                    int y2 = random.Next(image.Height);                    g.DrawLine(new Pen(Color.Black), x1, y1, x2, y2);                }                //Font(字体 大小 粗细                var font = new Font("Arial", 12, (FontStyle.Bold));                //LinearGradientBrush的参数是画的图像,起始颜色,简便的终止颜色,粗细,true                var brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue,                    Color.DarkRed, 1.2f, true);                g.DrawString(checkCode, font, brush, 2, 2); //文本 字体 颜色 起始位置x 起始位置y                //画图片的前景噪音点                for (int i = 0; i < 100; i++)                {                    int x = random.Next(image.Width);                    int y = random.Next(image.Height);                    image.SetPixel(x, y, Color.FromArgb(random.Next()));                }                //画图片的边框线                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);                var ms = new MemoryStream();                image.Save(ms, ImageFormat.Gif);                Response.ClearContent(); //清空缓冲区                Response.ContentType = "image/Gif";                Response.BinaryWrite(ms.ToArray());            }            finally            {                g.Dispose();                image.Dispose();            }        }    }}
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