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  • 随机生成文字图片验证码

     1、随机生成汉字

     //传入你要生成汉字的个数
    public string GetGB2312String(int count)
        {
            var random = new Random();
            var bs = new byte[count * 2];
            for (var i = 0; i < count; i++)
            {
                var c = GetGB2312Char(random);
                bs[i * 2] = (byte)(c.X + 0xa0);
                bs[i * 2 + 1] = (byte)(c.Y + 0xa0);
            }
            return Encoding.GetEncoding("GB2312").GetString(bs);
        }
        Point GetGB2312Char(Random random)
        {
            // 国标一级字(共3755个): 区:16-55, 位:01-94, 55区最后5位为空位
            var 区 = random.Next(40) + 16;
            var 位 = random.Next(区 == 55 ? 89 : 94) + 1;
            return new Point(区, 位);
        }

    2、添加汉字样式和干扰线

    //传入你随机生成的汉字
        public byte[] CreateValidateGraphic(string validateCode)
        {
            Bitmap image = new Bitmap(150, 60);
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();
                //清空图片背景色
                g.Clear(Color.White);
                //画图片的干扰线
                for (int i = 0; i < 25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }
                //设置字体样式
                Font font = new Font("Verdana", 31, (FontStyle.Bold | FontStyle.Underline));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
                Color.GreenYellow, Color.DarkRed, 1.2f, true);
    
                Matrix matrix = new Matrix();
                g.Transform = matrix;
                matrix.Rotate(20);
                g.DrawLine(Pens.Blue, 0, 0, 250, 0);
                g.DrawString(validateCode, font, brush, 3, 2);
    
    
                //画图片的前景干扰点
                for (int i = 0; i < 100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片流
                return stream.ToArray();
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }

    3、保存到项目中

       //汉字传入后返回比特数组
        byte[] by = valid.CreateValidateGraphic(hanzi);
    
         //比特数组转成流
         MemoryStream stream = new MemoryStream(by);
    
         //流转成图片
         Image image = Image.FromStream(stream);
         PictureBox pic = new PictureBox();
          pic.Image = image;
    
          //保存到项目中
          image.Save(@"E:MyProjectMytestMytestImagepic.jpg");

    4、结果

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  • 原文地址:https://www.cnblogs.com/lwqstyle/p/4762475.html
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