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<%@ WebHandler Language="C#" CodeBehind="40GetAuthImg.ashx.cs" Class="ASPnet._40GetAuthImg" %>using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.IO;
using System.Web.SessionState;
namespace ASPnet
{
/// <summary>
/// _40GetAuthImg 的摘要描述
/// </summary>
public class _40GetAuthImg : IHttpHandler, IRequiresSessionState
{
public void ProcessRequest(HttpContext context)
{
int NumCount = 6;
string strNumber= GetARandomNumber(NumCount);
context.Session["Number"] = strNumber;
//產生一個圖片
Bitmap img = new Bitmap(strNumber.Length * 25, 40);
//用bitmap產生一個Graphics物件
Graphics g = Graphics.FromImage(img);
Random r = new Random();
int intRed = r.Next(0,256);
int intGreen = r.Next(0, 256);
int intBlue = r.Next(0, 256);
g.Clear(Color.FromArgb(1, intRed, intGreen, intBlue));
//畫噪音線
for (int i = 0; i < 60; i++)
{
int x1 = r.Next(img.Width);
int y1 = r.Next(img.Height);
int x2 = r.Next(img.Width);
int y2 = r.Next(img.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
//用矩形物件產生一個矩形
Rectangle MyRect = new Rectangle(0, 0, img.Width, img.Height);
intRed = r.Next(0, 256);
intGreen = r.Next(0, 256);
intBlue = r.Next(0, 256);
Color color1 = Color.FromArgb(intRed, intGreen, intBlue);
intRed = r.Next(0, 256);
intGreen = r.Next(0, 256);
intBlue = r.Next(0, 256);
Color color2 = Color.FromArgb(intRed, intGreen, intBlue);
//文字的顏色(漸層色)
System.Drawing.Drawing2D.LinearGradientBrush brush =
new System.Drawing.Drawing2D.LinearGradientBrush(MyRect,color1,color2, 1.2f);
//設定字型
Font font = new Font("Arial Black", 20, FontStyle.Bold);
//把字畫在矩形框中
g.DrawString(strNumber, font, brush, 5, 5);
//噪音點
for (int i = 0; i < 300; i++)
{
int x1 = r.Next(img.Width);
int y1 = r.Next(img.Height);
img.SetPixel(x1,y1,Color.FromArgb(r.Next(256)));
}
//畫外框線
g.DrawRectangle(new Pen(Color.Silver), 0, 0, img.Width - 1, img.Height - 1);
//把Bitmap放入Image物件中
Image image = img;
//將圖片存成JPG格式置於記憶體中
MemoryStream ms = new MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
//output
context.Response.Clear();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(ms.ToArray());
}
private string GetARandomNumber(int n)
{
string strNumber = "";
Random r = new Random();
for(int i=0;i<n;i++)
{
strNumber += r.Next(0,10);
}
return strNumber;
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="40GGetAuthImg.aspx.cs" Inherits="ASPnet._40GGetAuthImg" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
帳號:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<img src="40GetAuthImg.ashx" />
<asp:Button ID="Button2" runat="server" Text="重新產生" />
<br />
驗證碼:<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ASPnet
{
public partial class _40GGetAuthImg : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if(TextBox2.Text== Session["Number"].ToString())
{
Label1.Text = "驗證碼正確";
}
else
Label1.Text = "驗證碼不正確";
}
}
}