验证码的修饰问题？

[.云哲.]

context.Response.ContentType = "text/JPEG";
//context.Response.Write("Hello World");
using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(100, 50))
{
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
{
Random rand = new Random();
int code = rand.Next(1000,9999);//随机产生验证码
string strCode = code.ToString();
//如果在一般处理程序中操作Session,就必须调用IRequiresSessionState 接口
HttpContext .Current .Session ["Code"]=strCode ;//创建一个Session对象，将验证码放入Session中
g.DrawString(strCode,new System.Drawing.Font("宋",20),System .Drawing .Brushes .Red ,new System .Drawing .PointF (0,0));
bitmap .Save (context .Response .OutputStream ,System .Drawing.Imaging .ImageFormat .Jpeg);
}
}
这个事最原始的验证码的，我想更验证码字母的之间的间距，和背景颜色，一个字母挨着另一个字母，看着很死板。望高手指点指点。

[蝶恋花雨]

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
public partial class include_ValidateCode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string tmp = RndNum(5).ToUpper();
        this.Session["ImageV"] = tmp;
        HttpCookie a = new HttpCookie("ImageV", tmp);
        Response.Cookies.Add(a);
        this.CreateCheckCodeImage(tmp);
    }
    #region//创建验证码
    private void ValidateCode(string VNum)
    {
        Bitmap Img = null;
        Graphics g = null;
        MemoryStream ms = null;

        int gheight = VNum.Length * 10;
        Img = new Bitmap(gheight, 25);
        g = Graphics.FromImage(Img);
        //背景颜色 
        g.Clear(Color.White);
        //文字字体 
        Font f = new Font("Arial Black", 10);
        //文字颜色 
        SolidBrush s = new SolidBrush(Color.Black);
        g.DrawString(VNum, f, s, 3, 3);
        ms = new MemoryStream();
        Img.Save(ms, ImageFormat.Jpeg);
        Response.ClearContent();
        Response.ContentType = "image/Jpeg";
        Response.BinaryWrite(ms.ToArray());

        g.Dispose();
        Img.Dispose();
        Response.End();
    }
    #endregion
    #region//生验证码随即数字+字母组合
    private string RndNum(int VcodeNum)
    {
        string Vchar = "a,b,c,d,e,0,1,2,3,4,5,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,0,1,2,3,4,5,6,7,8,9,w,x,y,z,a,b,c,d,e,f,g,h,i,j,k,l,m,1,2,3,4,5,6,7,8,9,n,o,p,q,r,s,t,u,v,w,x,y,z";
        string[] VcArray = Vchar.Split(new Char[] { ',' });
        string VNum = "";
        int temp = -1;

        Random rand = new Random();

        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(35);
            if (temp != -1 && temp == t)
            {
                return RndNum(VcodeNum);
            }
            temp = t;
            VNum += VcArray[t];
        }
        return VNum;
    }
    #endregion
    #region //创建验证码背景图片
    private 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 * 13.0)), 21);
        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, 1);

            //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);
            Response.ClearContent();
            Response.ContentType = "image/Gif";
            Response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }
    #endregion
}

这个好

[.云哲.]

没有什么特点，我只想问问什么处理字符之间的距离。挨着不好看的。我刚刚发现g.Clear(Color.White);
是用来设置图片背景的。

[韩小婼]

Randoms.aspx.cs后台
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;

namespace Web
{
public partial class Randoms : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string[] str = new string[4];
string serverCode = "";
//生成随机生成器
Random random = new Random();
for (int i = 0; i < 4; i++)
{
str[i] = random.Next(10).ToString().Substring(0, 1);
}
CreateCheckCodeImage(str);
foreach (string s in str)
{
serverCode += s;
}
Session["serverCode"] = serverCode;
}

private void CreateCheckCodeImage(string[] checkCode)
{
if (checkCode == null || checkCode.Length <= 0)
return;

System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 30);
System.Drawing.Graphics g = Graphics.FromImage(image);

try
{
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 < 20; 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);
}

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

for (int k = 0; k <= checkCode.Length - 1; k++)
{
int cindex = random.Next(7);
int findex = random.Next(5);

Font drawFont = new Font(f[findex], 16, (System.Drawing.FontStyle.Bold));



SolidBrush drawBrush = new SolidBrush(c[cindex]);

float x = 5.0F;
float y = 0.0F;
float width = 20.0F;
float height = 25.0F;
int sjx = random.Next(10);
int sjy = random.Next(image.Height - (int)height);

RectangleF drawRect = new RectangleF(x + sjx + (k * 25), y + sjy, width, height);

StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Center;

g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat);
}

//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);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}

}
}
调用的时候前台代码<asp:Image ID="Image1" runat="server" ImageUrl="~/Randoms.aspx" />

[韩小婼]

Randoms.aspx.cs后台
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;

namespace Web
{
public partial class Randoms : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string[] str = new string[4];
string serverCode = "";
//生成随机生成器
Random random = new Random();
for (int i = 0; i < 4; i++)
{
str[i] = random.Next(10).ToString().Substring(0, 1);
}
CreateCheckCodeImage(str);
foreach (string s in str)
{
serverCode += s;
}
Session["serverCode"] = serverCode;
}

private void CreateCheckCodeImage(string[] checkCode)
{
if (checkCode == null || checkCode.Length <= 0)
return;

System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 30);
System.Drawing.Graphics g = Graphics.FromImage(image);

try
{
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 < 20; 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);
}

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

for (int k = 0; k <= checkCode.Length - 1; k++)
{
int cindex = random.Next(7);
int findex = random.Next(5);

Font drawFont = new Font(f[findex], 16, (System.Drawing.FontStyle.Bold));



SolidBrush drawBrush = new SolidBrush(c[cindex]);

float x = 5.0F;
float y = 0.0F;
float width = 20.0F;
float height = 25.0F;
int sjx = random.Next(10);
int sjy = random.Next(image.Height - (int)height);

RectangleF drawRect = new RectangleF(x + sjx + (k * 25), y + sjy, width, height);

StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Center;

g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat);
}

//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);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}

}
}
调用的时候前台代码<asp:Image ID="Image1" runat="server" ImageUrl="~/Randoms.aspx" />

[韩小婼]

[honkerhero]

用页面过时了，还是使用验证码控件，拖拽一个即可

[子夜__]

去MSDN看看Drawing的API 自己画吧。。