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- using Admin.Core.Common.Attributes;
- using Admin.Core.Common.Configs;
- using System;
- using System.Drawing;
- using System.Drawing.Imaging;
- using System.IO;
- using System.Text;
- namespace Admin.Core.Common.Helpers
- {
- [SingleInstance]
- public class VerifyCodeHelper
- {
- private readonly AppConfig _appConfig;
- public VerifyCodeHelper(AppConfig appConfig)
- {
- _appConfig = appConfig;
- }
- private string GenerateRandom(int length)
- {
- var chars = new StringBuilder();
- //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 < length; i++)
- {
- chars.Append(character[rnd.Next(character.Length)]);
- }
- return chars.ToString();
- }
- public byte[] Draw(out string code, int length = 4)
- {
- int codeW = 110;
- int codeH = 36;
- int fontSize = 22;
- //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[] fonts = _appConfig.VarifyCode.Fonts;
- code = GenerateRandom(length);
- //创建画布
- using (Bitmap bmp = new Bitmap(codeW, codeH))
- using (Graphics g = Graphics.FromImage(bmp))
- using (MemoryStream ms = new MemoryStream())
- {
- g.Clear(Color.White);
- Random rnd = new Random();
- //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
- {
- string fnt;
- Font ft;
- Color clr;
- for (int i = 0; i < code.Length; i++)
- {
- fnt = fonts[rnd.Next(fonts.Length)];
- ft = new Font(fnt, fontSize);
- clr = color[rnd.Next(color.Length)];
- g.DrawString(code[i].ToString(), ft, new SolidBrush(clr), (float)i * 24 + 2, (float)0);
- }
- }
- //将验证码图片写入内存流,并将其以 "image/Png" 格式输出
- bmp.Save(ms, ImageFormat.Png);
- return ms.ToArray();
- }
- }
- public string GetBase64String(out string code, int length = 4)
- {
- return Convert.ToBase64String(Draw(out code, length));
- }
- }
- }
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