验证码怎么做 验证码怎么写 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 http://zhidao.baidu.com/question/125798450.html 参考:Asp.net(C#)实现验证码功能http://www.cnblogs.com/index/archive/2004/10/20/54692.aspx无刷新仿google波形扭曲彩色Asp.net验证码http://www.cnblogs.com/liudao/archive/2007/04/29/732065.html http://topic.csdn.net/u/20100119/17/2734ae65-2db1-4187-b234-1a71cf956887.html?92219 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}简单的 使用 <div style=" float:left"> <input type="text" runat="server" ID="yanzheng" maxlength="5" style="height:22px; width:70px; border:solid 1px #cadcb2; font-size:12px; color:#81b432;" /> </div> <div style="float:right; padding-top:2px;"><img id="yan" alt="刷新验证码" style=" cursor:pointer" onclick="javascript:DianJi();" src="../include/ValidateCode.aspx" /> </div>function DianJi()//刷新验证码 { document.getElementById("yan").src = "../include/ValidateCode.aspx" + "?" + Math.random(); } 建一个动态图片网页,在这个网页中生成验证码图片并将验证码存在session对象中,在登录或注销的网页上插入一个image,并链接到图片网页上,通过session对象中的值验证输入与生成的验证码是否一致 看3分钟msdn学会用g.DrawString你就会了,就是画些干扰线,再画些字母数字啥的,输出到页面即可。 http://www.zlblogs.com/verify-code.html用户登录验证码怎么做?请看这里,有例子下载。 请问在winform中如可加载一个svg或ai格式的失量图片,并显示在界面上 关于获取客户机的机器名 如何控制C#文本框输入格式 项目管理系统中的系统设置 SavafileDialog 我用c#自己写了一个控件(请问怎么生成控件啊?)和(怎么使用控件啊)????? Winform里面分页出现了问题... !!!!!求解释一条简单的C#语句 见着有分 再次求救各位大哥,帮忙看看我的代码(10行) C# 新增和更新Access 数据库中的图片 用户控件传值 正则怎么匹配连接地址?
http://www.cnblogs.com/index/archive/2004/10/20/54692.aspx无刷新仿google波形扭曲彩色Asp.net验证码
http://www.cnblogs.com/liudao/archive/2007/04/29/732065.html
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
}
简单的
<input type="text" runat="server" ID="yanzheng" maxlength="5" style="height:22px; width:70px; border:solid 1px #cadcb2; font-size:12px; color:#81b432;" /> </div>
<div style="float:right; padding-top:2px;"><img id="yan" alt="刷新验证码" style=" cursor:pointer" onclick="javascript:DianJi();" src="../include/ValidateCode.aspx" /> </div>function DianJi()//刷新验证码
{ document.getElementById("yan").src = "../include/ValidateCode.aspx" + "?" + Math.random(); }
用户登录验证码怎么做?
请看这里,有例子下载。