如何判断验证码是否正确
我做了一个页面，不知道如何判断验证码是否正确？验证码页面：
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.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace DiplomaProject.IdentifyingCode
{
public partial class Code : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ GenerateCheckCode();//调用验证嘛函数，页面加载生成字符；
CreateCheckCodeImage(GenerateCheckCode());//将字符加到背景中去；
}
private String GenerateCheckCode() //产生验证码
{ int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 4; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
Session["CheckCode"] = checkCode;
return checkCode;
}
private void CreateCheckCodeImage(string checkCode)//用于产生背景图像
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new Bitmap(150,50);
Graphics g = Graphics.FromImage(image);
try
{
//生成随即生成器;
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Width);
int y2 = random.Next(image.Width);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new System.Drawing.Font("Arial", 40, (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);
//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()));
}
//画图片的前景噪音点
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();
}
}
}
}
登录页面的aspx:
<img src="IdentifyingCode/Code.aspx" id="yzm" onclick="this.src='IdentifyingCode/Code.aspx?abc='+Math.random()" alt="图片看不清？点击重新得到验证码" style="cursor:hand;" />
登录页面的aspx.cs:
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 PYQ.BLL;
using PYQ.Model;
namespace DiplomaProject
{
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.ltlShowMessageBox.Text = null;
Session.Clear();
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
this.ltlShowMessageBox.Text = null;
AdminInfo info = new AdminInfo();
info.UserName = this.txtAdminName.Text;
info.UserPwd = this.txtAdminPaw.Text;
PYQ.BLL.Admin obj = new Admin();
try
{
switch (obj.Login(ref info))
{
case Admin.LoginType.UserNameNoExists:
this.ltlShowMessageBox.Text = "<script>alert('用户名不存在！');</script>";
Session["Refurbish"] = null;
break;
case Admin.LoginType.ErrUserPwd:
this.ltlShowMessageBox.Text = " <script>alert('密码错误！');</script>";
Session["Refurbish"] = null;
break;
case Admin.LoginType.LoginSuccess:
Session["IamOk"] = "YouAreOk";
Session["Refurbish"] = "1";
Session["AdminName"] = this.txtAdminName.Text.ToString();
Response.Redirect("SCS/SystemFrame.aspx");
break;
}
}
catch (Exception E)
{
Response.Write(E.ToString());
}
}
}
}
请问登录页面的aspx.cs如何做判断？ --------------------编程问答-------------------- 在线等哦。。。。。。。。。。。。。。。。 --------------------编程问答-------------------- 学习中！！！！！ --------------------编程问答-------------------- 还是没人来............... --------------------编程问答-------------------- 哎，你不是存了Session["CheckCode"] = checkCode;
登录是判断下不就OK？
判断输入的内容与session["CheckCode"]是否相同就行了啊？ --------------------编程问答--------------------
--------------------编程问答-------------------- --------------------编程问答-------------------- Session["CheckCode"]=GenerateCheckCode();
protected void Button1_Click(object sender, EventArgs e)
{
if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox3.Text.ToString().Trim(), true) != 0)
{
sm.ShowLocation("验证码输入有误。");
}
else
{
}
}
然后按 5楼的. --------------------编程问答-------------------- 楼上正解
你在点击登陆的时候判断文本框的值和Session中的值是否一致就行了撒 --------------------编程问答-------------------- 使用session啊 --------------------编程问答-------------------- 用session存起来。再跟输入的比对。 --------------------编程问答-------------------- 在
for (int i = 0; i < 4; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
在点击登陆的时候判断文本框的值和Session中的值是否一致就行
之后加 session。Add（"XX",checkCode）；
--------------------编程问答-------------------- 顶
up
补充：.NET技术 , ASP.NET
