Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P3

Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P1

... Chapter 7: Graphical Examples with Perl/Tk- P1 The Tk extension to Perl can be used to create a Graphical User Interface (GUI) to your Perl programs ... show a few examples of Tk-based web clients, which go beyond the command-line interface that we've been using so far in this book:[1]  xword, a dictionary client  track, a graphical version ... simple program that will just prompt for the word and go look it up without all that extra hassle. Anyone familiar with the xwebster client for the X Window System will find xword to be vaguely familiar,...

Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P2

... Chapter 7: Graphical Examples with Perl/Tk- P2 The do_search( ) function will take an optional $url argument, to give ... we need to delimit it from the prior text (which we insert into our text widget with the flush_text( ) function) with a few returns. Note that flush_text( ) takes the same arguments as any of ... to call our function, do_search( ), with the URL we extracted from the HTML tag. Then we insert the text for the link into the text widget, and associate it with the tag we just built. Figure...

Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P3

... Chapter 7: Graphical Examples with Perl/Tk- P3 Our destinations list is an almost exact copy of the list you'd see on the web page. For ease in using, we placed ... going to use a default of today for the date field. The FedEx web page expects it in the form of "DayMonthYear", and digits with only one number require a leading zero. The string returned ... letter, it would scroll to the first entry starting with that letter. Or you could put an additional entry, and search for any word starting with those characters: my $response_f = $mw->Frame;...

Tài liệu Web Client Programming with Perl-Chapter 7: Graphical Examples with Perl/Tk- P4 docx

... Chapter 7: Graphical Examples with Perl/Tk- P4 Check if Servers Are up: webping For the last example, we'll build a GUI interface that will allow us to check and see if several web sites ... similar to the UNIX ping command, we call it webping. This application would be useful to a web administrator who had to keep track of many different web sites, and wanted to know when one was ... Automode"); $mw->after('cancel', $id); } } And finally, webping looks like Figure 7-4. Figure 7-4. webping client 1. I say "we," but I really mean "she"...

Web Client Programming with Perl-Chapter 3: Learning HTTP- P3

... header. Clients use this information to correctly handle the media type and format of the entity- body. A client might also use a Content-type header with the POST or PUT method. Most commonly, with ... If-Modified-Since, et al. To accommodate client- side caching of documents, the client can use the If- Modified-Since header with the GET method. When using this option, the client requests the server to ... Transfer-Encoding header with the chunked parameter. When a client is involved in a client- pull/server-push operation, it may be possible that there is no end to the entity-body. For example, a client program...

Web Client Programming with Perl-Chapter 4: The Socket Library- P1

... it's not fully compliant with the HTTP specs, the web server won't understand you! Perhaps your web client works with one web server but not another. Or maybe your web client works most of the ... and map a client& apos;s incoming request to a file handle. After a client request has been accepted, all subsequent communication with the client is referenced through the file handle with sysread( ... cease communication between the client and server, call close( ). Since this book is primarily about client programming, we'll talk about the socket calls used by clients first, followed by the...

Web Client Programming with Perl-Chapter 4: The Socket Library- P2

... Socket; # include Socket module require 'tcp.pl'; # file with Open_TCP routine require &apos ;web. pl'; # file with parseURL routine use vars qw($opt_h $opt_H $opt_r $opt_d); use ... network connection close(F); } Shell Hypertext cat With hcat, one can easily retrieve documents from remote web servers. But there are times when a client request needs to be more complex than hcat ... shcat's STDIN, and it will forward it on to the web server you specify. This allows you to do things like HTML form postings with POST, or a file upload with PUT, and selectively look at the results....

Web Client Programming with Perl-Chapter 5: The LWP Library- P1

... that are useful for client programming. The LWP Module The LWP module, in the context of web clients, performs client requests over the network. There are 10 classes in all within the LWP module, ... module describes client requests, server responses, and dates, and computes a client/ server negotiation.  The LWP module is the core of all web client programs. It allows the client to communicate ... spoken between web clients and servers. Now we'll fill in the rest of the puzzle: how your program establishes and manages the connection required for speaking HTTP. In writing web clients and...

Web Client Programming with Perl-Chapter 5: The LWP Library- P2

... In the context of web client programming, you'll usually get an HTTP::Response object from LWP::UserAgent and LWP::RobotUA. If you plan to write extensions to LWP or a web server or proxy ... as a scalar. $r->code([$code]) When invoked without any parameters, the code( ) method returns the object's response code. When invoked with a status code as the first parameter, code( ... Not to be confused with the entity-body of the response. This is the human-readable text that a user would usually see in the first line of an HTTP response from a server. With a response code...

Web Client Programming with Perl-Chapter 6: Example LWP Programs-P1

... that a client may exhibit. The examples in this chapter all use a simple command-line interface. In Chapter 7, Graphical Examples with Perl/Tk, we have some additional examples with a graphical ... features. We present three broad categories of web client programs:  Simple clients--programs that perform actions for users in real time, usually with a finite list of URLs to act upon. In this ... categories are not set in stone. It is possible to write a periodic client that also happens to be a recursive client. Or a simple client might become periodic if the document indicates that the...

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