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Patches in Trac will be applied to trunk, so make sure you ve checked out the SVN version of Django and updated it prior to creating the patch. If the patch will be significant in size or scope, you may even want to check out a fresh copy into a new directory, so that any problems with your changes don t adversely impact any of your other Django projects while you get it just right. When you re confident that you ve successfully addressed the problem, generate a file sometimes called a diff file or often just a diff containing your changes. All SVN clients provide a way to create a diff, so check out your client s documentation for details, but if you re using the command-line client, it s quite a simple process.

gif image remains (rather than the red X error icon) The GetBookImageaspx performs the time-consuming task of retrieving the image, which can involve contacting a web service or connecting to a database In this case, it simply hands the work off to a dedicated class named FindBook Once the URL is retrieved, it redirects the page: protected void Page_Load(object sender, SystemEventArgs e) { FindBook findBook = new FindBook(); string imageUrl = findBookGetImageUrl(RequestQueryString["isbn"]); ResponseRedirect(imageUrl); } The FindBook class is more complex It uses screen scraping to find the <img> tag for the picture on the Amazon website Unfortunately, Amazon s image thumbnails don t have a clear naming convention that would allow you to retrieve the URL directly.

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However, based on the ISBN you can find the book detail page, and you can look through the HTML of the book detail page to find the image URL That s the task the FindBook class performs Two methods are at work in the FindBook class The GetWebPageAsString() method requests a URL, retrieves the HTML content, and converts it to a string, as shown here: public string GetWebPageAsString(string url) { // Create the request WebRequest requestHtml = WebRequestCreate(url); // Get the response WebResponse responseHtml = requestHtmlGetResponse();.

// Read the response stream. StreamReader r = new StreamReader(responseHtml.GetResponseStream()); string htmlContent = r.ReadToEnd(); r.Close(); return htmlContent; } The GetImageUrl() method uses GetWebPageAsString() and a little regular expression wizardry. Amazon image URLs take the form shown here: http://images.amazon.com/images/P/" + [ISBN] + [some character sequence] Using the regular expression, the code matches the full URL (with the ending character sequence) and returns it. Here s the complete code: public string GetImageUrl(string isbn) { try { // Find the pointer to the book cover image. // Amazon.com has the most cover images, // so go there to look for it. // Start with the book details page. isbn = isbn.Replace("-", ""); string bookUrl = "http://www.amazon.com/exec/obidos/ASIN/" + isbn; // Now retrieve the HTML content of the book details page. string bookHtml = GetWebPageAsString(bookUrl); // Search the page for an image tag that has the requested ISBN. string imgTagPattern = "<img src=\"(http://images.amazon.com/images/P/" + isbn + "[^\"]+)\""; Match imgTagMatch = Regex.Match(bookHtml, imgTagPattern); return imgTagMatch.Groups[1].Value; } catch { return ""; } }

Using the dedicated Amazon web service would obviously be a more flexible and robust approach, although it wouldn t change this example, which demonstrates the performance enhancements of a little JavaScript. Web services are dealt with in Part 6, and you can get information about Amazon s offerings at http://www.amazon.com/gp/aws/landing.html.

Then, simply attach the patch to the ticket in Trac, describing what changes you made and what you did to verify that the ticket s primary issue was indeed addressed. It will be reviewed in time by the appropriate developers, and if it seems to do the job well enough and the ticket merits fixing, your patch will help guide the core developers when they update trunk with a fix for the issue. Please be aware that patches rarely make it from Trac to trunk without any modifications. The core developers are very experienced with Django s internal code, so they may make stylistic changes, add code to address more situations or reduce code to make it more readable or maintainable.

The end result is a page that initially loads with default images, as shown in Figure 29-3.

Figure 29-3. The initial view of the page After a short delay, the images will begin to appear, as shown in Figure 29-4.

Once loaded, the real book images will load in the background, but the user can begin using the page immediately.

Pipelines connect the standard output of one command directly to the standard input of another. The pipe symbol (|) is used between the commands: $ printf "%s\n" "$RANDOM" "$RANDOM" "$RANDOM" "$RANDOM" | tee FILENAME 618 11267

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