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c#生成base64编码的图片验证码
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; using System.Linq; using System.Web; namespace FirsteLite.OMS.Helper { /// <summary> /// Summary description for ValidateCode. /// </summary> public static class ValidateCodeHelper { /// <summary> /// Validation Code generated fromt these charaters. /// Note: l,L 1(number), o, O, 0(number) are removed /// </summary> private const string strValidateCodeBound = "abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ23456789"; privatestaticstring[] Fonts = newstring[] { "Helvetica", "Geneva", "sans-serif", "Verdana", "Times New Roman", "Courier New", "Arial" }; ///<summary>/// Generate random string ///</summary>publicstaticstring GetRandomString(int numberLength) { string valString = string.Empty; Random theRandomNumber = new Random((int)DateTime.Now.Ticks); for (int int_index = 0; int_index < numberLength; int_index++) valString += strValidateCodeBound[theRandomNumber.Next(strValidateCodeBound.Length - 1)].ToString(); return valString; } ///<summary>/// Generate random Color ///</summary>privatestatic Color GetRandomColor() { Random RandomNum_First = new Random((int)DateTime.Now.Ticks); System.Threading.Thread.Sleep(RandomNum_First.Next(50)); Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks); int int_Red = RandomNum_First.Next(256); int int_Green = RandomNum_Sencond.Next(256); int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green; int_Blue = (int_Blue > 255) ? 255 : int_Blue; return Color.FromArgb(int_Red, int_Green, int_Blue); } publicstaticstring CreateBase64ImageSrc(string validateCode) { int int_ImageWidth = validateCode.Length * 22; Random newRandom = new Random(); Bitmap theBitmap = new Bitmap(int_ImageWidth + 6, 38); Graphics theGraphics = Graphics.FromImage(theBitmap); theGraphics.Clear(Color.White); drawLine(theGraphics, theBitmap, newRandom); theGraphics.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, theBitmap.Width - 1, theBitmap.Height - 1); for (int int_index = 0; int_index < validateCode.Length; int_index++) { Matrix X = new Matrix(); X.Shear((float)newRandom.Next(0, 300) / 1000 - 0.25f, (float)newRandom.Next(0, 100) / 1000 - 0.05f); theGraphics.Transform = X; string str_char = validateCode.Substring(int_index, 1); var startFontColor = Color.FromArgb(newRandom.Next(255, 256), newRandom.Next(0, 256), newRandom.Next(0, 256), newRandom.Next(0, 256)); var endFontColor = Color.FromArgb(newRandom.Next(255, 256), newRandom.Next(0, 256), newRandom.Next(0, 256), newRandom.Next(0, 256)); System.Drawing.Drawing2D.LinearGradientBrush newBrush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, theBitmap.Width, theBitmap.Height), startFontColor, endFontColor, 1.2f, true); Point thePos = new Point(int_index * 21 + 1 + newRandom.Next(3), 1 + newRandom.Next(13)); Font theFont = new Font(Fonts[newRandom.Next(Fonts.Length - 1)], newRandom.Next(14, 18), FontStyle.Bold); theGraphics.DrawString(str_char, theFont, newBrush, thePos); } drawPoint(theBitmap, newRandom); var ms = new MemoryStream(); theBitmap.Save(ms, ImageFormat.Png); returnstring.Format("data:image/png;base64,{0}", Convert.ToBase64String(ms.ToArray())); } ///<summary>/// Draw Line for noise ///</summary>privatestaticvoid drawLine(Graphics gfc, Bitmap img, Random ran) { var rnd = new Random(); for (int i = 0; i < 50; i++) { var c = Color.FromArgb(rnd.Next(0, 256), rnd.Next(0, 256), rnd.Next(0, 256), rnd.Next(0, 256)); int x1 = ran.Next(img.Width); int y1 = ran.Next(img.Height); int x2 = ran.Next(img.Width); int y2 = ran.Next(img.Height); gfc.DrawLine(new Pen(c), x1, y1, x2, y2); } } ///<summary>/// Draw Point for noise ///</summary>privatestaticvoid drawPoint(Bitmap img, Random ran) { for (int i = 0; i < 30; i++) { int x = ran.Next(img.Width); int y = ran.Next(img.Height); img.SetPixel(x, y, Color.FromArgb(ran.Next())); } } } }
原文:https://www.cnblogs.com/nanfei/p/12956037.html
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