验证码生成器-优快云博客

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
namespace CNTZCMS.ClassLib
{
/// <summary>
///RndCode 的摘要说明
/// </summary>
public class RndCode
{
public RndCode()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
public static string GenerateCheckCode()
{
int intFirst, intSec, intTemp;
string checkCode = String.Empty;
System.Random random = new Random();
intFirst = random.Next(1, 10);
intSec = random.Next(1, 10);
switch (random.Next(1, 3).ToString())
{
case "2":
if (intFirst < intSec)
{
intTemp = intFirst;
intFirst = intSec;
intSec = intTemp;
}
checkCode = intFirst + "-" + intSec + "=";
System.Web.HttpContext.Current.Session["ValidCode"] = intFirst - intSec;
break;
default:
checkCode = intFirst + "+" + intSec + "=";
System.Web.HttpContext.Current.Session["ValidCode"] = intFirst + intSec;
break;
}
//Response.Cookies.Add(new HttpCookie("ValidCode",Movie.Common.AES.EncryptAes(checkCode)));
return checkCode;
}
#region 产生波形滤镜效果
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 将位图背景填充为白色
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(System.Drawing.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 ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
// 取得当前点的颜色
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
System.Drawing.Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
return destBmp;
}
#endregion
public static void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap p_w_picpath = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 15.0)), 25);
Graphics g = Graphics.FromImage(p_w_picpath);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 12; i++)
{
int x1 = random.Next(p_w_picpath.Width);
int x2 = random.Next(p_w_picpath.Width);
int y1 = random.Next(p_w_picpath.Height);
int y2 = random.Next(p_w_picpath.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, p_w_picpath.Width, p_w_picpath.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 1, 1);
//画图片的前景噪音点
//for (int i = 0; i < 100; i++)
//{
// int x = random.Next(p_w_picpath.Width);
// int y = random.Next(p_w_picpath.Height);
// p_w_picpath.SetPixel(x, y, Color.FromArgb(random.Next()));
//}
//p_w_picpath = TwistImage(p_w_picpath, true, 3, 1);//画图片的波形滤镜效果
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, p_w_picpath.Width - 1, p_w_picpath.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
p_w_picpath.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
System.Web.HttpContext.Current.Response.ClearContent();
System.Web.HttpContext.Current.Response.ContentType = "p_w_picpath/Gif";
System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
p_w_picpath.Dispose();
}
}
}
}