谁能提供给我一个好看点的生成验证码的例子！要好看点的~
谁能提供给我一个好看点的生成验证码的例子！要好看点的~
谢谢了~在线等各位帮忙咯
[解决办法]
http://blog.csdn.net/ChengKing/archive/2007/01/05/1475140.aspx
[解决办法]
using System;
using System.Data;
using System.Configuration;
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;
/// <summary>
/// CheckCode 的摘要说明
/// </summary>
public class CheckCode
{
public CheckCode()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static void DrawImage()
{
CheckCode img = new CheckCode();
HttpContext.Current.Session[ "CheckCode "] = img.RndNum(4);
img.checkCodes(HttpContext.Current.Session[ "CheckCode "].ToString());
}
/// <summary>
/// 生成验证图片
/// </summary>
/// <param name= "checkCode "> 验证字符 </param>
private void checkCodes(string checkCode)
{
int iwidth = (int)(checkCode.Length * 13);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 23);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
//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[] font = { "Verdana ", "Microsoft Sans Serif ", "Comic Sans MS ", "Arial ", "宋体 " };
Random rand = new Random();
//随机输出噪点
for (int i = 0; i < 50; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
}
//输出不同字体和颜色的验证码字符
for (int i = 0; i < checkCode.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);
Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), f, b, 3 + (i * 12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
//Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Jpeg ";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
/// <summary>
/// 生成随机的字母
/// </summary>
/// <param name= "VcodeNum "> 生成字母的个数 </param>
/// <returns> string </returns>
private string RndNum(int VcodeNum)
{
string Vchar = "0,1,2,3,4,5,6,7,8,9 ";
string[] VcArray = Vchar.Split( ', ');
string VNum = " "; //由于字符串很短，就不用StringBuilder了
int temp = -1; //记录上次随机数值，尽量避免生产几个一样的随机数
//采用一个简单的算法以保证生成随机数的不同
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(VcArray.Length);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
[解决办法]
// 在需要验证码的地方托一个Image控件，并将该控件的imageUrl属性设置为本页面即可
// 一下是你要新建的页面Validate.aspx
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;
using System.ComponentModel;
public partial class ValidateCode : System.Web.UI.Page
{
protected void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
string RandomString = GetValidateStr(4); // 获取指定个数个字符验证码
this.Session[ "RandomString "] = RandomString;// 存放验证码字符串
DrawString(RandomString); // “画出”字符串
}
// 获得验证码字符串
private string GetValidateStr(int Length)
{
// 验证码来源
string strAll = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ";
string strReturn = " ";
// 随机数种子
Random rand = new Random();
//循环获得验证码
for (int Index = 0; Index < Length; Index++)
{
strReturn += strAll[rand.Next(strAll.Length)].ToString();
}
return strReturn;
}
// 将字符串保存在本页面的输出流中
private void DrawString(string str)
{
// 实例化位图
Bitmap bmp = new Bitmap(64, 24);
// 实例化画布
Graphics g = Graphics.FromImage(bmp);
// 清除画布颜色，并用指定颜色填充
g.Clear(Color.White);
// 以指定格式画字符串——字体、画笔，以及绘制的起始位置
g.DrawString(str, new Font( "Times New Roman ", 12), new SolidBrush(Color.Blue), 0, 0);
// 释放画布
g.Dispose();
// 保存到输出流
bmp.Save(this.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
