WinFrom验证码的实现

最新推荐文章于 2020-03-29 17:53:42 发布

原创最新推荐文章于 2020-03-29 17:53:42 发布 · 257 阅读

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#WinFrom验证码的实现

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本文详细介绍了如何在Windows Forms应用程序中实现验证码功能。从创建随机数字和字母到结合扭曲、旋转、噪点等图像处理技术，确保验证码的安全性和难以破解性。同时，讨论了验证码的更新策略和用户交互设计，提升用户体验。

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  /// <summary>
        /// WinFrom验证码的实现
        /// </summary>
        /// <param name="pictureBox1"></param>
        /// <returns></returns>
        public static string  pictureBoxVerification(PictureBox pictureBox1) {


            Random r = new Random();
            string str = null;
            for (int i = 0; i < 5; i++)
            {
                int rNumber = r.Next(0, 10);
                str += rNumber;
            }
            //MessageBox.Show(str);
            //创建GDI对象
            Bitmap bmp = new Bitmap(150, 40);
            Graphics g = Graphics.FromImage(bmp);


            for (int i = 0; i < 5; i++)
            {
                Point p = new Point(i * 20, 0);
                string[] fonts = { "微软雅黑", "宋体", "隶属", "仿宋", "黑体" };
                Color[] colors = { Color.Yellow, Color.Red, Color.Blue, Color.Black, Color.Green };
                g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, 5)], 20, FontStyle.Bold), new SolidBrush(colors[r.Next(0, 5)]), p);
            }

            for (int i = 0; i < 20; i++)
            {
                Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                g.DrawLine(new Pen(Brushes.Green), p1, p2);
            }

            for (int i = 0; i < 500; i++)
            {
                Point p = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                bmp.SetPixel(p.X, p.Y, Color.Black);
            }

            //将图片向前到PictureBox中
            pictureBox1.Image = bmp;

            return str;
        }