48 lines
1.3 KiB
C#
48 lines
1.3 KiB
C#
using System;
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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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public class CaptchaService
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{
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public string generatedCaptchaCode;
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public int wrp = 0;
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// 生成验证码图像并返回Base64字符串
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public (string captchaImage, string captchaCode) GenerateCaptcha()
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{
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generatedCaptchaCode = GenerateRandomCode(4); // 生成5位随机字符
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wrp = 2;
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Bitmap bitmap = new Bitmap(100, 40);
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using (Graphics g = Graphics.FromImage(bitmap))
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{
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g.Clear(Color.White);
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using (Font font = new Font("Arial", 20))
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{
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g.DrawString(generatedCaptchaCode, font, Brushes.Black, 10, 10);
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}
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}
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wrp = 1;
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using (MemoryStream ms = new MemoryStream())
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{
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bitmap.Save(ms, ImageFormat.Png);
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string base64Image = Convert.ToBase64String(ms.ToArray());
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return (base64Image, generatedCaptchaCode);
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}
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}
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// 生成随机字符
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private string GenerateRandomCode(int length)
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{
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const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345689";
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Random random = new Random();
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return new string(Enumerable.Repeat(chars, length)
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.Select(s => s[random.Next(s.Length)]).ToArray());
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}
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}
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