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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Runtime.Versioning;
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using System.Text;
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namespace VOL.Core.Utilities
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{
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public static class VierificationCode
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{
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private static readonly string[] _chars = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
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public static string RandomText()
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{
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string code = "";//产生的随机数
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int temp = -1;
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Random rand = new Random();
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for (int i = 1; i < 5; i++)
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{
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if (temp != -1)
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{
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rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
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}
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int t = rand.Next(61);
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if (temp != -1 && temp == t)
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{
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return RandomText();
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}
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temp = t;
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code += _chars[t];
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}
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return code;
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}
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[SupportedOSPlatform("Windows")]
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[Obsolete("仅在 Windows 上支持 System.Drawing.Common,具体请参考：https://docs.microsoft.com/zh-cn/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only")]
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public static string CreateBase64Imgage(string code)
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{
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Random random = new Random();
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//验证码颜色集合
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Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
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//验证码字体集合
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string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
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using var img = new Bitmap((int)code.Length * 18, 32);
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using var g = Graphics.FromImage(img);
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g.Clear(Color.White);//背景设为白色
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//在随机位置画背景点
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for (int i = 0; i < 100; i++)
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{
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int x = random.Next(img.Width);
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int y = random.Next(img.Height);
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g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
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}
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//验证码绘制在g中
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for (int i = 0; i < code.Length; i++)
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{
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int cindex = random.Next(7);//随机颜色索引值
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int findex = random.Next(5);//随机字体索引值
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Font f = new Font(fonts[findex], 15, FontStyle.Bold);//字体
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Brush b = new SolidBrush(c[cindex]);//颜色
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int ii = 4;
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if ((i + 1) % 2 == 0)//控制验证码不在同一高度
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{
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ii = 2;
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}
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g.DrawString(code.Substring(i, 1), f, b, 3 + (i * 12), ii);//绘制一个验证字符
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}
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using (MemoryStream stream = new MemoryStream())
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{
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img.Save(stream, ImageFormat.Jpeg);
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byte[] b = stream.ToArray();
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return Convert.ToBase64String(stream.ToArray());
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}
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}
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}
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}
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