<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="GetBookImage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
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.Text.RegularExpressions;
using System.Net;
using System.IO;
public partial class GetBookImage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
FindBook findBook = new FindBook();
Response.Redirect(findBook.GetImageUrl(Request.QueryString["isbn"]));
}
}
public class FindBook
{
public string GetImageUrl(string isbn)
{
try
{
isbn = isbn.Replace("-", "");
string bookUrl = "http://www.amazon.com/exec/obidos/ASIN/" + isbn;
string bookHtml = GetWebPageAsString(bookUrl);
string imgTagPattern = "<img src=\"(http://images.amazon.com/images/P/" + isbn + "[^\"]+)\"";
Match imgTagMatch = Regex.Match(bookHtml, imgTagPattern);
return imgTagMatch.Groups[1].Value;
}
catch
{
return "";
}
}
public string GetWebPageAsString(string url)
{
WebRequest requestHtml = WebRequest.Create(url);
WebResponse responseHtml = requestHtml.GetResponse();
StreamReader r = new StreamReader(responseHtml.GetResponseStream());
string htmlContent = r.ReadToEnd();
r.Close();
return htmlContent;
}
}