1 /// <summary> 2 /// 验证码类 3 /// </summary> 4 public class Rand 5 { 6 #region 生成随机数字 7 /// <summary> 8 /// 生成随机数字 9 /// </summary> 10 /// <param name="length">生成长度</param> 11 public static string Number(int Length) 12 { 13 return Number(Length, false); 14 } 15 16 /// <summary> 17 /// 生成随机数字 18 /// </summary> 19 /// <param name="Length">生成长度</param> 20 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param> 21 public static string Number(int Length, bool Sleep) 22 { 23 if (Sleep) System.Threading.Thread.Sleep(3); 24 string result = ""; 25 System.Random random = new Random(); 26 for (int i = 0; i < Length; i++) 27 { 28 result += random.Next(10).ToString(); 29 } 30 return result; 31 } 32 #endregion 33 34 #region 生成随机字母与数字 35 /// <summary> 36 /// 生成随机字母与数字 37 /// </summary> 38 /// <param name="IntStr">生成长度</param> 39 public static string Str(int Length) 40 { 41 return Str(Length, false); 42 } 43 44 /// <summary> 45 /// 生成随机字母与数字 46 /// </summary> 47 /// <param name="Length">生成长度</param> 48 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param> 49 public static string Str(int Length, bool Sleep) 50 { 51 if (Sleep) System.Threading.Thread.Sleep(3); 52 char[] Pattern = 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' }; 53 string result = ""; 54 int n = Pattern.Length; 55 System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); 56 for (int i = 0; i < Length; i++) 57 { 58 int rnd = random.Next(0, n); 59 result += Pattern[rnd]; 60 } 61 return result; 62 } 63 #endregion 64 65 #region 生成随机纯字母随机数 66 /// <summary> 67 /// 生成随机纯字母随机数 68 /// </summary> 69 /// <param name="IntStr">生成长度</param> 70 public static string Str_char(int Length) 71 { 72 return Str_char(Length, false); 73 } 74 75 /// <summary> 76 /// 生成随机纯字母随机数 77 /// </summary> 78 /// <param name="Length">生成长度</param> 79 /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param> 80 public static string Str_char(int Length, bool Sleep) 81 { 82 if (Sleep) System.Threading.Thread.Sleep(3); 83 char[] Pattern = new char[] { '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' }; 84 string result = ""; 85 int n = Pattern.Length; 86 System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); 87 for (int i = 0; i < Length; i++) 88 { 89 int rnd = random.Next(0, n); 90 result += Pattern[rnd]; 91 } 92 return result; 93 } 94 #endregion 95 } 96 97 /// <summary> 98 /// 验证图片类 99 /// </summary> 100 public class YZMHelper 101 { 102 #region 私有字段 103 private string text; 104 private Bitmap image; 105 private int letterWidth = 16; //单个字体的宽度范围 106 private int letterHeight = 20; //单个字体的高度范围 107 private static byte[] randb = new byte[4]; 108 private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider(); 109 private Font[] fonts = 110 { 111 new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular), 112 new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular), 113 new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular), 114 new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular) 115 }; 116 #endregion 117 118 #region 公有属性 119 /// <summary> 120 /// 验证码 121 /// </summary> 122 public string Text 123 { 124 get { return this.text; } 125 } 126 127 /// <summary> 128 /// 验证码图片 129 /// </summary> 130 public Bitmap Image 131 { 132 get { return this.image; } 133 } 134 #endregion 135 136 #region 构造函数 137 public YZMHelper() 138 { 139 //HttpContext.Current.Response.Expires = 0; 140 //HttpContext.Current.Response.Buffer = true; 141 //HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1); 142 //HttpContext.Current.Response.AddHeader("pragma", "no-cache"); 143 //HttpContext.Current.Response.CacheControl = "no-cache"; 144 this.text = Rand.Number(4); 145 CreateImage(); 146 } 147 #endregion 148 149 #region 私有方法 150 /// <summary> 151 /// 获得下一个随机数 152 /// </summary> 153 /// <param name="max">最大值</param> 154 private static int Next(int max) 155 { 156 rand.GetBytes(randb); 157 int value = BitConverter.ToInt32(randb, 0); 158 value = value % (max + 1); 159 if (value < 0) value = -value; 160 return value; 161 } 162 163 /// <summary> 164 /// 获得下一个随机数 165 /// </summary> 166 /// <param name="min">最小值</param> 167 /// <param name="max">最大值</param> 168 private static int Next(int min, int max) 169 { 170 int value = Next(max - min) + min; 171 return value; 172 } 173 #endregion 174 175 #region 公共方法 176 /// <summary> 177 /// 绘制验证码 178 /// </summary> 179 public void CreateImage() 180 { 181 int int_ImageWidth = this.text.Length * letterWidth; 182 Bitmap image = new Bitmap(int_ImageWidth, letterHeight); 183 Graphics g = Graphics.FromImage(image); 184 g.Clear(Color.White); 185 for (int i = 0; i < 2; i++) 186 { 187 int x1 = Next(image.Width - 1); 188 int x2 = Next(image.Width - 1); 189 int y1 = Next(image.Height - 1); 190 int y2 = Next(image.Height - 1); 191 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); 192 } 193 int _x = -12, _y = 0; 194 for (int int_index = 0; int_index < this.text.Length; int_index++) 195 { 196 _x += Next(12, 16); 197 _y = Next(-2, 2); 198 string str_char = this.text.Substring(int_index, 1); 199 str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper(); 200 Brush newBrush = new SolidBrush(GetRandomColor()); 201 Point thePos = new Point(_x, _y); 202 g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos); 203 } 204 for (int i = 0; i < 10; i++) 205 { 206 int x = Next(image.Width - 1); 207 int y = Next(image.Height - 1); 208 image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255))); 209 } 210 image = TwistImage(image, true, Next(1, 3), Next(4, 6)); 211 g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1)); 212 this.image = image; 213 } 214 215 /// <summary> 216 /// 字体随机颜色 217 /// </summary> 218 public Color GetRandomColor() 219 { 220 Random RandomNum_First = new Random((int)DateTime.Now.Ticks); 221 System.Threading.Thread.Sleep(RandomNum_First.Next(50)); 222 Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks); 223 int int_Red = RandomNum_First.Next(180); 224 int int_Green = RandomNum_Sencond.Next(180); 225 int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green; 226 int_Blue = (int_Blue > 255) ? 255 : int_Blue; 227 return Color.FromArgb(int_Red, int_Green, int_Blue); 228 } 229 230 /// <summary> 231 /// 正弦曲线Wave扭曲图片 232 /// </summary> 233 /// <param name="srcBmp">图片路径</param> 234 /// <param name="bXDir">如果扭曲则选择为True</param> 235 /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高,一般为3</param> 236 /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param> 237 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) 238 { 239 double PI = 6.283185307179586476925286766559; 240 Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); 241 Graphics graph = Graphics.FromImage(destBmp); 242 graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height); 243 graph.Dispose(); 244 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width; 245 for (int i = 0; i < destBmp.Width; i++) 246 { 247 for (int j = 0; j < destBmp.Height; j++) 248 { 249 double dx = 0; 250 dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen; 251 dx += dPhase; 252 double dy = Math.Sin(dx); 253 int nOldX = 0, nOldY = 0; 254 nOldX = bXDir ? i + (int)(dy * dMultValue) : i; 255 nOldY = bXDir ? j : j + (int)(dy * dMultValue); 256 257 Color color = srcBmp.GetPixel(i, j); 258 if (nOldX >= 0 && nOldX < destBmp.Width 259 && nOldY >= 0 && nOldY < destBmp.Height) 260 { 261 destBmp.SetPixel(nOldX, nOldY, color); 262 } 263 } 264 } 265 srcBmp.Dispose(); 266 return destBmp; 267 } 268 #endregion