Download CGI programming on the World Wide Web by Shishir Gundavaram PDF

By Shishir Gundavaram

The realm extensive internet is greater than a spot to place up smart records and lovely photographs. utilizing the typical Gateway Interface (CGI), you could supply interactive queries and serve quick details from databases, labored up into colourful photos. This ebook bargains a complete clarification of CGI and similar innovations for those that carry directly to the dream of supplying their very own details servers on the internet. the writer starts off at the start, explaining the price of CGI and the way it really works, then strikes speedily into the delicate information of programming. the vast majority of examples use the most typical platform (UNIX) and the preferred language (Perl) used for CGI programming this day. notwithstanding, the publication additionally introduces the necessities of making CGI paintings with different structures and languages.

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N"; } exit (0); As is the case with binary files, one read on the file handle will retrieve the entire file. Compare that to text files where one read will return only a single line. As a result, this example is fine when dealing with small graphic files, but is not very efficient with larger files. gif"); if (open (IMAGE, "<" . $gif_image)) { $no_bytes = (stat ($gif_image))[7]; $piece_size = $no_bytes / 10; print "Content-type: image/gif", "\n"; print "Content-length: $no_bytes", "\n\n"; for ($loop=0; $loop <= $no_bytes; $loop += $piece_size) { read (IMAGE, $data, $piece_size); print $data; } close (IMAGE); } else { print "Content-type: text/plain", "\n\n"; print "Sorry!

In addition, WebSite, Netscape, and Microsoft all include Windows CGI interfaces. However, the CGI implementations are all slightly different. Visual Basic Visual Basic is perfect for developing CGI applications because it supports numerous features for accessing data in the Windows environment. This includes OLE, DDE, Sockets, and ODBC. ODBC, or Open Database Connectivity, allows you to access a variety of relational and non-relational databases. The actual implementation of the Windows CGI interface determines how CGI variables are read from a Visual Basic program.

The remainder of the script follows: print ; } else { print "Content-type: text/plain", "\n\n"; print "Sorry! ", "\n"; } exit (0); As is the case with binary files, one read on the file handle will retrieve the entire file. Compare that to text files where one read will return only a single line. As a result, this example is fine when dealing with small graphic files, but is not very efficient with larger files. gif"); if (open (IMAGE, "<" . $gif_image)) { $no_bytes = (stat ($gif_image))[7]; $piece_size = $no_bytes / 10; print "Content-type: image/gif", "\n"; print "Content-length: $no_bytes", "\n\n"; for ($loop=0; $loop <= $no_bytes; $loop += $piece_size) { read (IMAGE, $data, $piece_size); print $data; } close (IMAGE); } else { print "Content-type: text/plain", "\n\n"; print "Sorry!

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