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Produktbeschreibungen
Amazon.co.uk
Perl and LWP explains how to write programs that browse the Web, using the excellent Library for the World Wide Web or LWP. It is aimed at developers who already know both Perl and HTML, although you don't need to be an expert in either.
The fascination of this topic is that it makes you see the Web in a different way, not as a set of pages for users to browse, but as a huge database for your programs to explore. The most robust technique for querying Web sites programmatically is through XML Web Services, but this approach is in its infancy. LWP takes a different route, called screen-scraping. In essence, your Perl code pretends to be a browser and grabs HTML for processing. Using LWP you could write a command-line program to search your favourite auction site, fetch news headlines, or check multiple retail sites for the best prices. As the author acknowledges, the problem with screen-scraping is its brittleness: if the target Web site adopts a new look, it breaks your code. There are also interesting fair usage issues. Even so, it's a powerful technique with many possible applications. This clear and concise guide comes complete with typically terse Perl code examples. Topics include LWP basics, posting form data, processing results with regular expressions, using trees to process HTML, imitating different browser types, and supporting cookies programmatically. An appendix offers handy information like HTTP status codes, character tables, and MIME types. LWP is large, but while this title does not attempt to cover all the modules, it does provide all you need to start coding your own Web-mining programs.--Tim Anderson
Amazon.com
Perl & LWP sets out to unwrap the Library for the Web in Perl (LWP), which is a collection of modules that make it easier to access and pick apart Web pages (and FTP-accessible files, and outgoing e-mail messages) from within your Perl programs. The book succeeds wonderfully, not only in conveying the technical aspects of LWP programming, but in making clear the fun of doing work that's very well suited to Perl. Sean Burke assumes that his readers know something about Perl, albeit not much, and a similar amount about HTML. He does a great job of explaining how LWP functions fit into Perl programs, and how you can use them to make reference to Internet resources far more easily than before.
Burke's narrative takes the form of a guided tour in which he introduces his readers to aspects of the LWP modules one by one. His tone is generally straightforward (sharp commentary alternates with brief code listings, with occasional passages of reference material), but there's sometimes an undercurrent of exuberance that makes the reader want to get going with his or her own programming right away. Overall, the emphasis is on teaching both LWP and Perl itself to the extent necessary to do LWP work. Because of the concise and nicely indexed code modules, though, you'll find this book useful as a reference after you're under way with LWP. --David Wall
Topics covered: How to program with LWP and Perl itself. All of LWP's strong points--including HTML parsing (with tokens and trees as well as with regular expressions), HTML generation and modification, manipulation of HTML forms, and the operation of spiders--are covered. This book has more of a tutorial tone than any similar reference material on the Internet.
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Buchdeckel | Copyright | Inhaltsverzeichnis | Auszug | Stichwortverzeichnis | Rückseite
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