求asp.net(C#)实现验证码源代码!!! 哪位有现成的asp.net(C#)实现验证码源代码,希望能共享下,谢谢啊 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 兄弟,怎么不用google找找,一大把呢http://blog.joycode.com/ghj/archive/2005/12/28/69611.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;public partial class GreadCoad : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { this.CreateCheckCodeImage(GenerateCheckCode()); } 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(); } Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode; } 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 * 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); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray()); } finally { g.Dispose(); image.Dispose(); } }}具体可以看http://www.codeclub.cn/forums/thread/211.aspx ○○○中文验证码○○○public class CreateValidateCode : IWelcome { public System.IO.MemoryStream CreateRegionCode(int nlength) { //定义一个字符串数组储存汉字编码的组成元素 string[] rBase=new String [16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"}; Random rnd = new Random(); //定义一个object数组用来 object[] bytes=new object[nlength]; /**//*每循环一次产生一个含两个元素的十六进制字节数组,并将其放入bject数组中 每个汉字有四个区位码组成 区位码第1位和区位码第2位作为字节数组第一个元素 区位码第3位和区位码第4位作为字节数组第二个元素 */ for( int i = 0; i < nlength; i++ ) { //区位码第1位 int r1=rnd.Next(11,14); string str_r1=rBase[r1].Trim(); //区位码第2位 rnd=new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);//更换随机数发生器的种子避免产生重复值 int r2; if (r1==13) { r2=rnd.Next(0,7); } else { r2=rnd.Next(0,16); } string str_r2=rBase[r2].Trim(); //区位码第3位 rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i); int r3=rnd.Next(10,16); string str_r3=rBase[r3].Trim(); //区位码第4位 rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i); int r4; if (r3==10) { r4=rnd.Next(1,16); } else if (r3==15) { r4=rnd.Next(0,15); } else { r4=rnd.Next(0,16); } string str_r4=rBase[r4].Trim(); //定义两个字节变量存储产生的随机汉字区位码 byte byte1=Convert.ToByte(str_r1 + str_r2,16); byte byte2=Convert.ToByte(str_r3 + str_r4,16); //将两个字节变量存储在字节数组中 byte[] str_r=new byte[]{byte1,byte2}; //将产生的一个汉字的字节数组放入object数组中 bytes.SetValue(str_r,i); } //return bytes; Encoding gb=Encoding.GetEncoding("gb2312"); string str1=gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[]))); string str2=gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); string str3=gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); string str4=gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); string checkCode = str1 + str2 + str3 + str4; if (checkCode == null || checkCode.Trim() == String.Empty) return null; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 22)), 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(15, 10, image.Width, image.Height), Color.Black, 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); return ms;// Response.ClearContent();// Response.ContentType = "image/Gif";// Response.BinaryWrite(ms.ToArray()); } finally { g.Dispose(); image.Dispose(); } } 我有,[email protected],昨天弄好的 关于留言板...小问题 图片显示 求助一个静态方法的问题 GridView 数字格式问题 asp.net后台如何修改页面上一个div的样式表属性? 想用后台将一段html代码放到页面某个地方,如何实现? 请教DataBinder.Eval()方法 今天女朋友生日,我高興。。。。。。大家來接分吧!!!!!!!!!!!!!!! 求助!这个问题我一急想不明白. asp.net如何显示用crystal report 9.2做好的报表? 去除字符串中的\t分隔符? 用 OracleConnection是 用到参数缺找不到 OracleDbType命名空间
http://blog.joycode.com/ghj/archive/2005/12/28/69611.aspx
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;public partial class GreadCoad : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());
} 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();
} Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode;
} 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 * 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);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}具体可以看http://www.codeclub.cn/forums/thread/211.aspx
{
public System.IO.MemoryStream CreateRegionCode(int nlength)
{
//定义一个字符串数组储存汉字编码的组成元素
string[] rBase=new String [16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
Random rnd = new Random();
//定义一个object数组用来
object[] bytes=new object[nlength]; /**//*每循环一次产生一个含两个元素的十六进制字节数组,并将其放入bject数组中
每个汉字有四个区位码组成
区位码第1位和区位码第2位作为字节数组第一个元素
区位码第3位和区位码第4位作为字节数组第二个元素
*/
for( int i = 0; i < nlength; i++ )
{
//区位码第1位
int r1=rnd.Next(11,14);
string str_r1=rBase[r1].Trim(); //区位码第2位
rnd=new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);//更换随机数发生器的种子避免产生重复值
int r2;
if (r1==13)
{
r2=rnd.Next(0,7);
}
else
{
r2=rnd.Next(0,16);
}
string str_r2=rBase[r2].Trim(); //区位码第3位
rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i);
int r3=rnd.Next(10,16);
string str_r3=rBase[r3].Trim(); //区位码第4位
rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i);
int r4;
if (r3==10)
{
r4=rnd.Next(1,16);
}
else if (r3==15)
{
r4=rnd.Next(0,15);
}
else
{
r4=rnd.Next(0,16);
}
string str_r4=rBase[r4].Trim(); //定义两个字节变量存储产生的随机汉字区位码
byte byte1=Convert.ToByte(str_r1 + str_r2,16);
byte byte2=Convert.ToByte(str_r3 + str_r4,16);
//将两个字节变量存储在字节数组中
byte[] str_r=new byte[]{byte1,byte2}; //将产生的一个汉字的字节数组放入object数组中
bytes.SetValue(str_r,i);
}
//return bytes;
Encoding gb=Encoding.GetEncoding("gb2312"); string str1=gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
string str2=gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
string str3=gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
string str4=gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); string checkCode = str1 + str2 + str3 + str4; if (checkCode == null || checkCode.Trim() == String.Empty)
return null; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 22)), 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(15, 10, image.Width, image.Height), Color.Black, 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);
return ms;
// Response.ClearContent();
// Response.ContentType = "image/Gif";
// Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}