1 using System; 2 using System.Data; 3 using System.Configuration; 4 using System.Collections; 5 using System.Web; 6 using System.Web.Security; 7 using System.Web.UI; 8 using System.Web.UI.WebControls; 9 using System.Web.UI.WebControls.WebParts; 10 using System.Web.UI.HtmlControls; 11 using System.Drawing; 12 using System.Text; 13 public partial class Admin_ValidCode : System.Web.UI.Page 14 { 15 protected void Page_Load(object sender, EventArgs e) 16 { 17 this.CreateCheckCodeImage(GenerateCheckCode()); 18 } 19 private string GenerateCheckCode() 20 { 21 int number; 22 //char code; 23 string checkCode = String.Empty; 24 System.Random random = new Random(); 25 Encoding gb = Encoding.GetEncoding("gb2312"); 26 //调用函数产生4个随机中文汉字编码 27 object[] bytes = CreateRegionCode(6); 28 //根据汉字编码的字节数组解码出中文汉字 29 string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); 30 string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); 31 string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); 32 string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); 33 //输出的控制台 34 checkCode = str1 + str2 + str3 + str4; 35 //for (int i = 0; i < 5; i++) 36 //{ 37 // number = random.Next(); 38 // if (number % 2 == 0) 39 // code = (char)('0' + (char)(number % 10)); 40 // else 41 // code = (char)('A' + (char)(number % 26)); 42 // checkCode += code.ToString(); 43 //} 44 Response.Cookies.Add(new HttpCookie("ValidCode",LjfLib.Encrypt.AES.EncryptAes(checkCode))); 45 //Session["ValidCode"] = checkCode; 46 47 return checkCode; 48 } 49 #region 产生波形滤镜效果 50 private static object[] CreateRegionCode(int strlength) 51 { 52 //定义一个字符串数组储存汉字编码的组成元素 53 string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; 54 Random rnd = new Random(); 55 //定义一个object数组用来 56 object[] bytes = new object[strlength]; 57 58 for (int i = 0; i < strlength; i++) 59 { 60 //区位码第1位 61 int r1 = rnd.Next(11, 14); 62 string str_r1 = rBase[r1].Trim(); 63 //区位码第2位 64 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的 65 //种子避免产生重复值 66 int r2; 67 if (r1 == 13) 68 { 69 r2 = rnd.Next(0, 7); 70 } 71 else 72 { 73 r2 = rnd.Next(0, 16); 74 } 75 string str_r2 = rBase[r2].Trim(); 76 //区位码第3位 77 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i); 78 int r3 = rnd.Next(10, 16); 79 string str_r3 = rBase[r3].Trim(); 80 //区位码第4位 81 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i); 82 int r4; 83 if (r3 == 10) 84 { 85 r4 = rnd.Next(1, 16); 86 } 87 else if (r3 == 15) 88 { 89 r4 = rnd.Next(0, 15); 90 } 91 else 92 { 93 r4 = rnd.Next(0, 16); 94 } 95 string str_r4 = rBase[r4].Trim(); 96 //定义两个字节变量存储产生的随机汉字区位码 97 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16); 98 byte byte2 = Convert.ToByte(str_r3 + str_r4, 16); 99 //将两个字节变量存储在字节数组中 100 byte[] str_r = new byte[] { byte1, byte2 }; 101 //将产生的一个汉字的字节数组放入object数组中 102 bytes.SetValue(str_r, i); 103 } 104 return bytes; 105 } 106 private const double PI = 3.1415926535897932384626433832795; 107 private const double PI2 = 6.283185307179586476925286766559; 108 private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) 109 { 110 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); 111 // 将位图背景填充为白色 112 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp); 113 graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height); 114 graph.Dispose(); 115 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width; 116 for (int i = 0; i < destBmp.Width; i++) 117 { 118 for (int j = 0; j < destBmp.Height; j++) 119 { 120 double dx = 0; 121 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen; 122 dx += dPhase; 123 double dy = Math.Sin(dx); 124 // 取得当前点的颜色 125 int nOldX = 0, nOldY = 0; 126 nOldX = bXDir ? i + (int)(dy * dMultValue) : i; 127 nOldY = bXDir ? j : j + (int)(dy * dMultValue); 128 System.Drawing.Color color = srcBmp.GetPixel(i, j); 129 if (nOldX >= 0 && nOldX < destBmp.Width 130 && nOldY >= 0 && nOldY < destBmp.Height) 131 { 132 destBmp.SetPixel(nOldX, nOldY, color); 133 } 134 } 135 } 136 return destBmp; 137 } 138 #endregion 139 private void CreateCheckCodeImage(string checkCode) 140 { 141 if (checkCode == null checkCode.Trim() == String.Empty) 142 return; 143 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 27.0)), 25); 144 Graphics g = Graphics.FromImage(image); 145 try 146 { 147 //生成随机生成器 148 Random random = new Random(); 149 //清空图片背景色 150 g.Clear(Color.White); 151 //画图片的背景噪音线 152 for (int i = 0; i < 12; i++) 153 { 154 int x1 = random.Next(image.Width); 155 int x2 = random.Next(image.Width); 156 int y1 = random.Next(image.Height); 157 int y2 = random.Next(image.Height); 158 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); 159 } 160 //Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold System.Drawing.FontStyle.Italic)); 161 Font font = new System.Drawing.Font("楷体_GB2312", 16, (System.Drawing.FontStyle.Bold)); 162 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); 163 g.DrawString(checkCode, font, brush, 2, 2); 164 //画图片的前景噪音点 165 for (int i = 0; i < 100; i++) 166 { 167 int x = random.Next(image.Width); 168 int y = random.Next(image.Height); 169 image.SetPixel(x, y, Color.FromArgb(random.Next())); 170 } 171 //image = TwistImage(image, true, 3, 1); 172 //画图片的波形滤镜效果 173 //画图片的边框线 174 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); 175 System.IO.MemoryStream ms = new System.IO.MemoryStream(); 176 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); 177 Response.ClearContent(); 178 Response.ContentType = "image/Gif"; 179 Response.BinaryWrite(ms.ToArray()); 180 } 181 finally 182 { 183 g.Dispose(); 184 image.Dispose(); 185 } 186 } 187 }