【日常笔记】生成验证码图片
public string MakeValidateCode() { char[] s = new char[] {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'}; string num = ""; Random r = new Random(); for (int i = 0; i < 4; i++) { num += s[r.Next(0, s.Length)].ToString(); } return num; }
生成验证所需的字母和数字组合
public byte[] CreateCheckCodeImage(string checkCode) { Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Brown, Color.DarkCyan, Color.Purple }; int len = colors.Length; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling(checkCode.Length * 14.5d), 25); 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); Font font = new System.Drawing.Font("Arial", 12, FontStyle.Bold); System.Drawing.Brush brush = new SolidBrush(colors[random.Next(0, len)]); SizeF size = g.MeasureString(checkCode, font); g.DrawString(checkCode, font, brush, (image.Width - size.Width) / 2, (image.Height - size.Height) / 2); Twist tw = new Twist(); //正弦扭曲 沿X轴 image = tw.TwistBitmap(image, false, 4, Math.PI); //正弦扭曲 沿Y轴 image = tw.TwistBitmap(image, true, 2, Math.PI / 2); g.Dispose(); g = Graphics.FromImage(image); //画图片的背景噪音线 for (int i = 0; i < 2; 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.Black), x1, y1, x2, y2); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); return ms.ToArray(); } finally { g.Dispose(); image.Dispose(); } }
生成图片,并且转化为字节数据