码迷,mamicode.com
首页 > Windows程序 > 详细

c# 生成验证码图片

时间:2018-10-01 12:24:53      阅读:193      评论:0      收藏:0      [点我收藏+]

标签:line   har   内存流   rom   red   except   nal   混淆   去掉   

   /// <summary>
        /// 生成验证码图片
        /// </summary>
        /// <returns></returns>
        public byte[] GetVerifyCode()
        {
            int codeW = 80;
            int codeH = 40;
            int fontSize = 18;
            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)];
            }

            //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();
            }
        } 

 

c# 生成验证码图片

标签:line   har   内存流   rom   red   except   nal   混淆   去掉   

原文地址:https://www.cnblogs.com/yuanzijian-ruiec/p/9734417.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!