• C#生成中文汉字验证码(源码)


    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 }
    庆幸的是我,一直没回头。
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  • 原文地址:https://www.cnblogs.com/rocblog/p/3054098.html
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