- using System;
- using System.Web;
- using System.Drawing;
- using System.Security.Cryptography;
- namespace DotNet.Utilities
- {
- /// <summary>
- /// 验证码类
- /// </summary>
- public class Rand
- {
- #region 生成随机数字
- /// <summary>
- /// 生成随机数字
- /// </summary>
- /// <param name="length">生成长度</param>
- public static string Number(int Length)
- {
- return Number(Length, false);
- }
- /// <summary>
- /// 生成随机数字
- /// </summary>
- /// <param name="Length">生成长度</param>
- /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
- public static string Number(int Length, bool Sleep)
- {
- if (Sleep) System.Threading.Thread.Sleep(3);
- string result = "";
- System.Random random = new Random();
- for (int i = 0; i < Length; i++)
- {
- result += random.Next(10).ToString();
- }
- return result;
- }
- #endregion
- #region 生成随机字母与数字
- /// <summary>
- /// 生成随机字母与数字
- /// </summary>
- /// <param name="IntStr">生成长度</param>
- public static string Str(int Length)
- {
- return Str(Length, false);
- }
- /// <summary>
- /// 生成随机字母与数字
- /// </summary>
- /// <param name="Length">生成长度</param>
- /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
- public static string Str(int Length, bool Sleep)
- {
- if (Sleep) System.Threading.Thread.Sleep(3);
- 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' };
- string result = "";
- int n = Pattern.Length;
- System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
- for (int i = 0; i < Length; i++)
- {
- int rnd = random.Next(0, n);
- result += Pattern[rnd];
- }
- return result;
- }
- #endregion
- #region 生成随机纯字母随机数
- /// <summary>
- /// 生成随机纯字母随机数
- /// </summary>
- /// <param name="IntStr">生成长度</param>
- public static string Str_char(int Length)
- {
- return Str_char(Length, false);
- }
- /// <summary>
- /// 生成随机纯字母随机数
- /// </summary>
- /// <param name="Length">生成长度</param>
- /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param>
- public static string Str_char(int Length, bool Sleep)
- {
- if (Sleep) System.Threading.Thread.Sleep(3);
- 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' };
- string result = "";
- int n = Pattern.Length;
- System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));
- for (int i = 0; i < Length; i++)
- {
- int rnd = random.Next(0, n);
- result += Pattern[rnd];
- }
- return result;
- }
- #endregion
- }
- /// <summary>
- /// 验证图片类
- /// </summary>
- public class YZMHelper
- {
- #region 私有字段
- private string text;
- private Bitmap image;
- private int letterCount = 4; //验证码位数
- private int letterWidth = 16; //单个字体的宽度范围
- private int letterHeight = 20; //单个字体的高度范围
- private static byte[] randb = new byte[4];
- private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
- private Font[] fonts =
- {
- new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular),
- new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular),
- new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular),
- new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular)
- };
- #endregion
- #region 公有属性
- /// <summary>
- /// 验证码
- /// </summary>
- public string Text
- {
- get { return this.text; }
- }
- /// <summary>
- /// 验证码图片
- /// </summary>
- public Bitmap Image
- {
- get { return this.image; }
- }
- #endregion
- #region 构造函数
- public YZMHelper()
- {
- HttpContext.Current.Response.Expires = 0;
- HttpContext.Current.Response.Buffer = true;
- HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);
- HttpContext.Current.Response.AddHeader("pragma", "no-cache");
- HttpContext.Current.Response.CacheControl = "no-cache";
- this.text = Rand.Number(4);
- CreateImage();
- }
- #endregion
- #region 私有方法
- /// <summary>
- /// 获得下一个随机数
- /// </summary>
- /// <param name="max">最大值</param>
- private static int Next(int max)
- {
- rand.GetBytes(randb);
- int value = BitConverter.ToInt32(randb, 0);
- value = value % (max + 1);
- if (value < 0) value = -value;
- return value;
- }
- /// <summary>
- /// 获得下一个随机数
- /// </summary>
- /// <param name="min">最小值</param>
- /// <param name="max">最大值</param>
- private static int Next(int min, int max)
- {
- int value = Next(max - min) + min;
- return value;
- }
- #endregion
- #region 公共方法
- /// <summary>
- /// 绘制验证码
- /// </summary>
- public void CreateImage()
- {
- int int_ImageWidth = this.text.Length * letterWidth;
- Bitmap image = new Bitmap(int_ImageWidth, letterHeight);
- Graphics g = Graphics.FromImage(image);
- g.Clear(Color.White);
- for (int i = 0; i < 2; i++)
- {
- int x1 = Next(image.Width - 1);
- int x2 = Next(image.Width - 1);
- int y1 = Next(image.Height - 1);
- int y2 = Next(image.Height - 1);
- g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
- }
- int _x = -12, _y = 0;
- for (int int_index = 0; int_index < this.text.Length; int_index++)
- {
- _x += Next(12, 16);
- _y = Next(-2, 2);
- string str_char = this.text.Substring(int_index, 1);
- str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();
- Brush newBrush = new SolidBrush(GetRandomColor());
- Point thePos = new Point(_x, _y);
- g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos);
- }
- for (int i = 0; i < 10; i++)
- {
- int x = Next(image.Width - 1);
- int y = Next(image.Height - 1);
- image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255)));
- }
- image = TwistImage(image, true, Next(1, 3), Next(4, 6));
- g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));
- this.image = image;
- }
- /// <summary>
- /// 字体随机颜色
- /// </summary>
- public 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(180);
- int int_Green = RandomNum_Sencond.Next(180);
- int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;
- int_Blue = (int_Blue > 255) ? 255 : int_Blue;
- return Color.FromArgb(int_Red, int_Green, int_Blue);
- }
- /// <summary>
- /// 正弦曲线Wave扭曲图片
- /// </summary>
- /// <param name="srcBmp">图片路径</param>
- /// <param name="bXDir">如果扭曲则选择为True</param>
- /// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
- /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
- public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
- {
- double PI = 6.283185307179586476925286766559;
- Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
- Graphics graph = Graphics.FromImage(destBmp);
- graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);
- graph.Dispose();
- double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
- for (int i = 0; i < destBmp.Width; i++)
- {
- for (int j = 0; j < destBmp.Height; j++)
- {
- double dx = 0;
- dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;
- dx += dPhase;
- double dy = Math.Sin(dx);
- int nOldX = 0, nOldY = 0;
- nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
- nOldY = bXDir ? j : j + (int)(dy * dMultValue);
- Color color = srcBmp.GetPixel(i, j);
- if (nOldX >= 0 && nOldX < destBmp.Width
- && nOldY >= 0 && nOldY < destBmp.Height)
- {
- destBmp.SetPixel(nOldX, nOldY, color);
- }
- }
- }
- srcBmp.Dispose();
- return destBmp;
- }
- #endregion
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/081020136261.html
来源: http://www.codesnippet.cn/detail/081020136261.html