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[验证码] C# YZMHelper验证码类与源码下载

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  • TA的每日心情
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    昨天 11:24
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    [LV.9]以坛为家II

    发表于 2014-1-21 08:50:49 | 显示全部楼层 |阅读模式
    C# YZMHelper验证码类与源码下载
    导读部分
    -------------------------------------------------------------------------------------------------------------
    C#基类|C#自定义类|C#帮助类--系列导航文章
    http://www.sufeinet.com/thread-655-1-1.html

    源码下载,请到基库中直接查找http://www.sufeinet.com/thread-655-1-1.html
    主要功能有 QQ截图20140121085054.jpg
    预览源码

    [C#] 纯文本查看 复制代码
    /// <summary>
    /// 类说明:YZMHelper
    /// 编 码 人:苏飞
    /// 联系方式:361983679  
    /// 更新网站:[url]http://www.sufeinet.com/thread-655-1-1.html[/url]
    /// </summary>
    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
        }
    }


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