Asp.net中我要自己手写验证码,哪位有相关代码

章子宝 2009-04-29 04:35:08

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阮晟 2012-05-20

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.aspx文件你怎么写的啊？？

dongjianhua520520 2010-05-14

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hao

皓月明 2009-04-30

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验证码多的是网上，去我的空间看看吧也许有

insus 2009-04-29

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参考:
http://www.cnblogs.com/insus/articles/1425377.html

蓝海D鱼 2009-04-29

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yuji821 2009-04-29

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随机数

zhaoqiliang527 2009-04-29

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顶~

greymouseyu 2009-04-29

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验证码类：



public class ValidateCode

{

    public ValidateCode()

    {

        //

        // TODO: 在此处添加构造函数逻辑

        //

    }

    /// <summary>

    /// 该方法是将生成的随机数写入图像文件

    /// </summary>

    /// <param name="VNum">VNum是一个随机数</param>

    public MemoryStream Create(out string VNum)

    {

        VNum = RndNum(4);

        Bitmap Img = null;

        Graphics g = null;

        MemoryStream ms = null;

        System.Random random = new Random();



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

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





        //定义图像的大小

        //生成图像的实例

        Img = new Bitmap((int)VNum.Length * 18, 32);



        g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象  



        g.Clear(Color.White);



        //画背景点

        for (int i = 0; i < 100; i++)

        {

            int x = random.Next(Img.Width);

            int y = random.Next(Img.Height);

            //Img.SetPixel(x, y,Color.LightGray);

            g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);

        }









        for (int i = 0; i < VNum.Length; i++)

        {

            int cindex = random.Next(7);

            int findex = random.Next(5);



            Font f = new System.Drawing.Font(fonts[findex], 13, System.Drawing.FontStyle.Bold);

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

            int ii = 4;

            if ((i + 1) % 2 == 0)

            {

                ii = 2;

            }

            g.DrawString(VNum.Substring(i, 1), f, b, 3 + (i * 12), ii);

        }



        ms = new MemoryStream();//生成内存流对象

        Img.Save(ms, ImageFormat.Jpeg);//将此图像以Png图像文件的格式保存到流中



        //回收资源





        g.Dispose();

        Img.Dispose();

        return ms;



    }



    /// <summary>

    /// 该方法用于生成指定位数的随机数

    /// </summary>

    /// <param name="VcodeNum">参数是随机数的位数</param>

    /// <returns>返回一个随机数字符串</returns>

    private string RndNum(int VcodeNum)

    {

        string Vchar = "1,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,p,p" +

            ",q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,P,Q" +

            ",R,S,T,U,V,W,X,Y,Z";

        string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组

        string VNum = "";

        int temp = -1;//记录上次随机数值，尽量避避免生产几个一样的随机数



        Random rand = new Random();

        //采用一个简单的算法以保证生成随机数的不同

        for (int i = 1; i < VcodeNum + 1; i++)

        {

            if (temp != -1)

            {

                rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));

            }



            int t = rand.Next(61);

            if (temp != -1 && temp == t)

            {

                return RndNum(VcodeNum);



            }

            temp = t;

            VNum += VcArray[t];

        }

        return VNum;

    }

}

处理页：gif.ashx



public class gif : IHttpHandler, System.Web.SessionState.IRequiresSessionState

{

    public void ProcessRequest (HttpContext context) 

    {

        ValidateCode gif = new ValidateCode();//初始化验证码生成类

        string valid = "";//定义随机数

        MemoryStream ms = gif.Create(out valid);//获取包括验证码图片的内存流

        context.Session["gif"] = valid;//验证码存储在Session中，供验证。

        context.Response.ClearContent();//清空输出流

        context.Response.ContentType = "image/png";//输出流的格式

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

        context.Response.End();

    }

 

    public bool IsReusable {

        get {

            return false;

        }

    }

}

调用页:



<img id="sign_img" height="30" src="Handle/gif.ashx" title="验证码" width="100" onclick="this.src='Handle/gif.ashx?'+new Date()" />

Nszaonce 2009-04-29

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忽忽~借用来参考下！

Adechen 2009-04-29

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楼上的正确

wuyq11 2009-04-29

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public class ValidCode
{
public ValidCode()
{
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));

checkCode += code.ToString();
}
// HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
return checkCode;
}

/// <summary>
/// 生成验证码图片
/// </summary>
public void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;

System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image);

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 < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);

g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}

Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);

//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
public void ValidateCode(string VNum)
{
Bitmap validateimage;
Graphics g;
validateimage = new Bitmap(50, 20, PixelFormat.Format24bppRgb);
g = Graphics.FromImage(validateimage);

g.DrawString(VNum, new Font("Comic Sans MS", 12), new SolidBrush(Color.White), new PointF(3, 0));
g.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(110, 20), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 60, 40)), 0, 0, 120, 30);
g.Save();
MemoryStream ms = new MemoryStream();
validateimage.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
HttpContext.Current.Response.End();
}
/// 生成随机数
public string MakeValidateCode()
{
char[] s = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
string num = "";
Random r = new Random();
for (int i = 0; i < 4; i++)
{
num += s[r.Next(0, s.Length)].ToString();
}
return num;
}