JumboTCMS_src/JumboTCMS.WebFile/plus/getcode.aspx.cs

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/*
 * 程序名称: JumboTCMS(将博内容管理系统通用版)
 * 
 * 程序版本: 7.x
 * 
 * 程序作者: 子木将博 (QQ：791104444@qq.com，仅限商业合作)
 * 
 * 版权申明: http://www.jumbotcms.net/about/copyright.html
 * 
 * 技术答疑: http://forum.jumbotcms.net/
 * 
 */

using System;
using System.Data;
using System.Web;

using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

using System.Security.Cryptography;
namespace JumboTCMS.WebFile.Plus
{
    public partial class _getcode : JumboTCMS.UI.BasicPage
    {
        private int letterWidth = 30;//单个文字的宽度范围
        private int letterHeight = 30;//单个文字的高度范围
        private int letterCount = 4;//验证码位数，不要随意改动
        private static byte[] randb = new byte[4];
        private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
        /// <summary>
        /// 产生波形滤镜效果
        /// </summary>
        protected void Page_Load(object sender, EventArgs e)
        {
            //防止网页后退--禁止缓存    
            //Response.Expires = 0;
            //Response.Buffer = true;
            //Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);
            //Response.AddHeader("pragma", "no-cache");
            //Response.CacheControl = "no-cache";
            Response.ClearContent(); //需要输出图象信息 要修改HTTP头 
            Response.ContentType = "image/jpeg";
            letterHeight = Str2Int(q("h"), 30);
            letterWidth = letterHeight;
            string str_ValidateCode = JumboTCMS.Common.ValidateCode.GetValidateCode(letterCount, true);
            CreateImage(str_ValidateCode);

        }
        /// <summary>
        /// 获得下一个随机数
        /// </summary>
        /// <param name="max">最大值</param>
        /// <returns></returns>
        private static int Next(int max)
        {
            rand.GetBytes(randb);
            int value = BitConverter.ToInt32(randb, 0);