using System;

using System.Collections;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Xml.Linq;

using System.Drawing;

using System.Web.SessionState;

namespace MT

{

    /// <summary>

    /// $codebehindclassname$ 的摘要说明

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    public class verCode : IHttpHandler, IRequiresSessionState

    {

        private Random RandomSeed = new Random();

        public void ProcessRequest(HttpContext context)

        {

            // 生成随机数 iIlLoO0

            string strWord = "23456789QWERTYUPASDFGHKXCVBNM";

            string NumStr = null;

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

            {

                NumStr += strWord[RandomSeed.Next(, strWord.Length)];

            }

            //将验证码保存到session中

            context.Session["vcode"] = NumStr.ToLower();

            CreateImages(context, NumStr);

        }

        #region 生成验证码图片

        private void CreateImages(HttpContext context,string checkCode)

        {

            int iwidth = (int)(checkCode.Length * );

            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, );

            Graphics g = Graphics.FromImage(image);

            g.Clear(Color.White);

            //定义颜色

            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };

            //定义字体

            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };

            Random rand = new Random();

            //随机输出噪点

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

            {

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

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

                g.DrawRectangle(new Pen(Color.LightGray, ), x, y, , );

            }

            //输出不同字体和颜色的验证码字符

            for (int i = ; i < checkCode.Length; i++)

            {

                int cindex = rand.Next();

                int findex = rand.Next();

                Font f = new System.Drawing.Font(font[findex], , System.Drawing.FontStyle.Bold);

                Brush b = new System.Drawing.SolidBrush(c[cindex]);

                int ii = ;

                if ((i + ) %  == )

                {

                    ii = ;

                }

                g.DrawString(checkCode.Substring(i, ), f, b,  + (i * ), ii);

            }

            //画一个边框

            g.DrawRectangle(new Pen(ColorTranslator.FromHtml("#CCCCCC"), ), , , image.Width - , image.Height - );

            //输出到浏览器

            System.IO.MemoryStream ms = new System.IO.MemoryStream();

            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            context.Response.ClearContent();

            //Response.ClearContent();

            context.Response.ContentType = "image/gif";

            context.Response.BinaryWrite(ms.ToArray());

            g.Dispose();

            image.Dispose();

        }

        #endregion

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

}