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- using LeaRun.Util;
- using System;
- using System.Drawing;
- using System.Drawing.Imaging;
- using System.IO;
- namespace LeaRun.Application.Code
- {
- /// <summary>
- /// 版 本 6.1
- /// Copyright (c) 2013-2016 上海力软信息技术有限公司
- /// 创建人:佘赐雄
- /// 日 期:2015.11.9 10:45
- /// 描 述:生成验证码
- /// </summary>
- public class VerifyCode
- {
- /// <summary>
- /// 生成验证码
- /// </summary>
- /// <returns></returns>
- public byte[] GetVerifyCode()
- {
- int codeW = 80;
- int codeH = 30;
- int fontSize = 16;
- string chkCode = string.Empty;
- //颜色列表,用于验证码、噪线、噪点
- Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };
- //字体列表,用于验证码
- string[] font = { "Times New Roman" };
- //验证码的字符集,去掉了一些容易混淆的字符
- char[] character = { '2', '3', '4', '5', '6', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
- Random rnd = new Random();
- //生成验证码字符串
- for (int i = 0; i < 4; i++)
- {
- chkCode += character[rnd.Next(character.Length)];
- }
- //写入Session、验证码加密
- WebHelper.WriteSession("session_verifycode", Md5Helper.MD5(chkCode.ToLower(), 16));
- //创建画布
- Bitmap bmp = new Bitmap(codeW, codeH);
- Graphics g = Graphics.FromImage(bmp);
- g.Clear(Color.White);
- //画噪线
- for (int i = 0; i < 1; i++)
- {
- int x1 = rnd.Next(codeW);
- int y1 = rnd.Next(codeH);
- int x2 = rnd.Next(codeW);
- int y2 = rnd.Next(codeH);
- Color clr = color[rnd.Next(color.Length)];
- g.DrawLine(new Pen(clr), x1, y1, x2, y2);
- }
- //画验证码字符串
- for (int i = 0; i < chkCode.Length; i++)
- {
- string fnt = font[rnd.Next(font.Length)];
- Font ft = new Font(fnt, fontSize);
- Color clr = color[rnd.Next(color.Length)];
- g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
- }
- //将验证码图片写入内存流,并将其以 "image/Png" 格式输出
- MemoryStream ms = new MemoryStream();
- try
- {
- bmp.Save(ms, ImageFormat.Png);
- return ms.ToArray();
- }
- catch (Exception)
- {
- return null;
- }
- finally
- {
- g.Dispose();
- bmp.Dispose();
- }
- }
- }
- }
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