(에센스) 2020년 6월 26일 C#라이브러리 이미지 인증코드 도움말 클래스

using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; namespace Core.Util { public static class ImgVerifyCodeHelper { /// /// /// /// /// byte[] code public static (byte[] imgBytes, string code) BuildVerifyCode(int length) { VerifyCodeFactory vc = new VerifyCodeFactory(); string code = vc.CreateValidateCode(length); byte[] bytes = vc.CreateValidateGraphic(code); return (bytes, code); } public class VerifyCodeFactory { /// /// , /// private char[] character = { '2', '3', '4', '5', '6', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' }; /// /// /// /// (0- ,1- ,2- ) /// /// public string CreateValidateCode(int codeType, int codeCount) { char code; string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < codeCount; i++) { code = character[random.Next(character.Length)]; // if (codeType == 1) { if ((int)code < 48 || (int)code > 57) { i--; continue; } } else if (codeType == 2) { if ((int)code < 65 || (int)code > 90) { i--; continue; } } checkCode += code; } return checkCode; } /// /// /// /// /// public string CreateValidateCode(int length) { int[] randMembers = new int[length]; int[] validateNums = new int[length]; string validateNumberStr = ""; // int seekSeek = unchecked((int)DateTime.Now.Ticks); Random seekRand = new Random(seekSeek); int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000); int[] seeks = new int[length]; for (int i = 0; i < length; i++) { beginSeek += 10000; seeks[i] = beginSeek; } // for (int i = 0; i < length; i++) { Random rand = new Random(seeks[i]); int pownum = 1 * (int)Math.Pow(10, length); randMembers[i] = rand.Next(pownum, Int32.MaxValue); } // for (int i = 0; i < length; i++) { string numStr = randMembers[i].ToString(); int numLength = numStr.Length; Random rand = new Random(); int numPosition = rand.Next(0, numLength - 1); validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); } // for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } public byte[] CreateValidateGraphic(string validateCode) { return CreateValidateGraphic(validateCode, 12, 22); } /// /// /// /// /// /// public byte[] CreateValidateGraphic(string validateCode, float fontsize, int height) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * (fontsize + 1)), height); Graphics g = Graphics.FromImage(image); try { // Random random = new Random(); // g.Clear(Color.White); // 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); } // Rectangle layoutRectange = new Rectangle(0, 0, image.Width, image.Height); Font font = new Font("Arial", fontsize, (FontStyle.Bold | FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(layoutRectange, Color.Blue, Color.DarkRed, 1.2f, true); StringFormat format = new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center }; g.DrawString(validateCode, font, brush, layoutRectange, format); // 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())); } // g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); // MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); // return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } } /// /// /// /// /// public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// /// /// /// public static double GetImageHeight() { return 22.5; } } } }

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