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 = 0; i < 5; i++)
{
NumStr += strWord[RandomSeed.Next(0, 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 * 13);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22);
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 = 0; i < 50; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
}
//输出不同字体和颜色的验证码字符
for (int i = 0; i < checkCode.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);

Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), f, b, 2 + (i * 12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(ColorTranslator.FromHtml("#CCCCCC"), 0), 0, 0, image.Width - 1, image.Height - 1);

//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;
}
}
}
}