求高手给个.NET验证码识别案例

qingqingpiaoye 2010-04-21 05:44:25

求高手给个.NET验证码识别案例，后者给个.net验证码类

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tanfe12 2010-04-22

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验证码识别案例给不了你，验证码类可以

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Drawing;

using System.Drawing.Imaging;

using System.Drawing.Drawing2D;

using System.IO;



/// <summary>

/// 生成验证码的类

/// </summary>

public class ValidateNumber

{

    public ValidateNumber()

    {

    }

    /// <summary>

    /// 验证码的最大长度

    /// </summary>

    public int MaxLength

    {

        get { return 10; }

    }

    /// <summary>

    /// 验证码的最小长度

    /// </summary>

    public int MinLength

    {

        get { return 1; }

    }

    /// <summary>

    /// 生成验证码

    /// </summary>

    /// <param name="length">指定验证码的长度</param>

    /// <returns></returns>

    public string CreateValidateNumber(int length)

    {

        int[] randMembers = new int[length];

        int[] validateNums = new int[length];

        string validateNumberStr = "";

        //生成起始序列值

        int seekSeek = unchecked((int)DateTime.Now.Ticks);

        Random seekRand = new Random(seekSeek);

        int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);

        int[] seeks = new int[length];

        for (int i = 0; i < length; i++)

        {

            beginSeek += 10000;

            seeks[i] = beginSeek;

        }

        //生成随机数字

        for (int i = 0; i < length; i++)

        {

            Random rand = new Random(seeks[i]);

            int pownum = 1 * (int)Math.Pow(10, length);

            randMembers[i] = rand.Next(pownum, Int32.MaxValue);

        }

        //抽取随机数字

        for (int i = 0; i < length; i++)

        {

            string numStr = randMembers[i].ToString();

            int numLength = numStr.Length;

            Random rand = new Random();

            int numPosition = rand.Next(0, numLength - 1);

            validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));

        }

        //生成验证码

        for (int i = 0; i < length; i++)

        {

            validateNumberStr += validateNums[i].ToString();

        }

        return validateNumberStr;

    }

    /// <summary>

    /// 创建验证码的图片

    /// </summary>

    /// <param name="containsPage">要输出到的page对象</param>

    /// <param name="validateNum">验证码</param>

    public void CreateValidateGraphic(Page containsPage, string validateNum)

    {

        Bitmap image = new Bitmap((int)Math.Ceiling(validateNum.Length * 12.5), 22);

        Graphics g = Graphics.FromImage(image);

        try

        {

            //生成随机生成器

            Random random = new Random();

            //清空图片背景色

            g.Clear(Color.White);

            //画图片的干扰线

            for (int i = 0; i < 25; i++)

            {

                int x1 = random.Next(image.Width);

                int x2 = random.Next(image.Width);

                int y1 = random.Next(image.Height);

                int y2 = random.Next(image.Height);

                g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);

            }

            Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));

            LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),

             Color.Blue, Color.DarkRed, 1.2f, true);

            g.DrawString(validateNum, font, brush, 3, 2);

            //画图片的前景干扰点

            for (int i = 0; i < 100; i++)

            {

                int x = random.Next(image.Width);

                int y = random.Next(image.Height);

                image.SetPixel(x, y, Color.FromArgb(random.Next()));

            }

            //画图片的边框线

            g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

            //保存图片数据

            MemoryStream stream = new MemoryStream();

            image.Save(stream, ImageFormat.Jpeg);

            //输出图片

            containsPage.Response.Clear();

            containsPage.Response.ContentType = "image/jpeg";

            containsPage.Response.BinaryWrite(stream.ToArray());

        }

        finally

        {

            g.Dispose();

            image.Dispose();

        }

    }

    /// <summary>

    /// 得到验证码图片的长度

    /// </summary>

    /// <param name="validateNumLength">验证码的长度</param>

    /// <returns></returns>

    public static int GetImageWidth(int validateNumLength)

    {

        return (int)(validateNumLength * 12.5);

    }

    /// <summary>

    /// 得到验证码的高度

    /// </summary>

    /// <returns></returns>

    public static double GetImageHeight()

    {

        return 22.5;

    }