为什么这个验证码不能产生图片

artcodeman 2008-12-03 11:10:46

Default.aspx



<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ComplexValide._Default" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>复杂验证码</title>

    <script type="text/javascript">

    

        function ShowValidImage() {

        var numkey = Math.random();

        document.getElementById("imgRandom").src = "/ValidCode.aspx?NumKey="+numkey;

    }

    

    </script>

</head>

<body>

    <form id="form1" runat="server">

    <div>

    <img id="imgRandom" alt="看不清？点击更换" onclick="ShowValidImage()" src="/ValidCode.aspx?" title="看不清？点击更换" />

    </div>

    </form>

</body>

</html>



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;



namespace ComplexValide

{

    public partial class _Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {



        }

    }

}

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CODE163 2008-12-03

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没看见生成验证吗的内容啊
给你个小示例http://bbs.hackdv.cn/showtopic-9.aspx

lxl_sports 2008-12-03

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document.getElementById("imgRandom").src = "~/ValidCode.aspx?NumKey="+numkey;

jfd198512 2008-12-03

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学习~
跟踪！

IAMBEN 2008-12-03

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ComplexValide._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>复杂验证码</title>
<script type="text/javascript">

function ShowValidImage() {
var numkey = Math.random();
document.getElementById("imgRandom").src = "/ValidCode.aspx?NumKey="+numkey;
}

</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<img id="imgRandom" alt="看不清？点击更换" onload="ShowValidImage()" onclick="ShowValidImage()" src="/ValidCode.aspx?" title="看不清？点击更换" />
</div>
</form>
</body>
</html>

dd__dd 2008-12-03

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document.getElementById("imgRandom").src = "../ValidCode.aspx?NumKey="+numkey;
src="../ValidCode.aspx?"
看看

artcodeman 2008-12-03

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顶

qhdrenzhijie 2008-12-03

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帮顶

tianyu_lianxin 2008-12-03

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string bgFilePath = Server.MapPath(".\\images\\bg" + new Random().Next(5) + ".jpg");
中的相对路径是不是错了，.\\images\\bg多了个\吧。

artcodeman 2008-12-03

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Teng_s2000 2008-12-03

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jiang_jiajia10 2008-12-03

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src="/ValidCode.aspx?"问号去掉看看

artcodeman 2008-12-03

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string bgFilePath = Server.MapPath(".\\images\\bg" + new Random().Next(5) + ".jpg");//随机找个图象

是不是要建一个images文件夹 ,然后里面放5个背景图片,bg1.jpg,bg2.jpg,bg3.jpg,bg4.jpg,bg5.jpg

yuchang1980 2008-12-03

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ValidCode.aspx

代码呢

artcodeman 2008-12-03

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ValidCode.aspx



ValidCode.aspx

ValidCode.aspx.cs



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.Imaging;

using System.Drawing.Drawing2D;

using System.Drawing;



namespace ComplexValide

{

    public partial class ValidCode : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            Random rd = new Random(); //创建随机数对象       



        //以下4行,产生由6个字母和数字组成的一个字符串

        string str = "ABCDEFGHIJKLMNOPQRSTURWXYZ0123456789我的复杂验证源码";

        string my51aspx = "";

        for (int i = 0; i < 6; i++)

        {

            my51aspx = my51aspx + str.Substring(rd.Next(42), 1);

        }

        //验证码值存放到Session中用来比较

        Session["Valid"] = my51aspx;



        //以下三句,通过随机找一个现有图象产生一个画布Bitmap

        string bgFilePath = Server.MapPath(".\\images\\bg" + new Random().Next(5) + ".jpg");//随机找个图象

        System.Drawing.Image imgObj = System.Drawing.Image.FromFile(bgFilePath);

        Bitmap newBitmap = new Bitmap(imgObj, 290, 80);//建立位图对象



        Graphics g = Graphics.FromImage(newBitmap);//根据上面创建的位图对象创建绘图面

        SolidBrush brush = new SolidBrush(Color.Black);//设置画笔颜色



        //定义一个含10种字体的数组

        String[] fontFamily ={ "Arial", "Verdana", "Comic Sans MS", "Impact", "Haettenschweiler", "Lucida Sans Unicode", "Garamond", "Courier New", "Book Antiqua", "Arial Narrow" };



        //通过循环,绘制每个字符,

        for (int a = 0; a < my51aspx.Length; a++)

        {

            Font textFont = new Font(fontFamily[rd.Next(9)], 30, FontStyle.Bold);//字体随机,字号大小30,加粗 

            //每次循环绘制一个字符,设置字体格式,画笔颜色,字符相对画布的X坐标,字符相对画布的Y坐标

            g.DrawString(my51aspx.Substring(a, 1), textFont, brush, 40 + a * 36, 20);

        }



        //保存画的图片到输出流中

        newBitmap.Save(Response.OutputStream, ImageFormat.Gif);



    }



        }

    }