Helper class to generate form data to post to web servers using the WWW class.

// Grab a screen shot and upload it to a CGI script.
// The CGI script must be able to hande form uploads.
var screenShotURL= "http://www.my-server.com/cgi-bin/screenshot.pl";
// Take a screen shot immediately
function Start() {
    UploadPNG();
}
function UploadPNG() {
    // We should only read the screen after all rendering is complete
    yield WaitForEndOfFrame();
    // Create a texture the size of the screen, RGB24 format
    var width = Screen.width;
    var height = Screen.height;
    var tex = new Texture2D( width, height, TextureFormat.RGB24, false );
    // Read screen contents into the texture
    tex.ReadPixels( Rect(0, 0, width, height), 0, 0 );
    tex.Apply();
    // Encode texture into PNG
    var bytes = tex.EncodeToPNG();
    Destroy( tex );
    // Create a Web Form
    var form = new WWWForm();
    form.AddField("frameCount", Time.frameCount.ToString());
    form.AddBinaryData("fileUpload", bytes, "screenShot.png", "image/png");
    // Upload to a cgi script
    var w = WWW(screenShotURL, form);
    yield w;
    if (!String.IsNullOrEmpty(w.error))
        print(w.error);
    else
        print("Finished Uploading Screenshot");
}

Here is a sample script that retrieves the high scores stored in a table in an SQL database.

// This example assumes that the user has entered his name into a
// variable called name and that score contains the user's current
// score.
var highscore_url = "http://www.my-site.com/highscores.pl";
var playName = "Player 1";
var score = -1;
function Start() {
	// Create a form object for sending high score data to the server
	var form = new WWWForm();
	// Assuming the perl script manages high scores for different games
	form.AddField( "game", "MyGameName" );
	 // The name of the player submitting the scores
	form.AddField( "playerName", playName );
	 // The score
	form.AddField( "score", score );
	// Create a download object
	var download = new WWW( highscore_url, form );
	// Wait until the download is done
	yield download;
	if(download.error) {
		print( "Error downloading: " + download.error );
		return;
	} else {
		// show the highscores
		Debug.Log(download.text);
	}
}

Here is a sample Perl script that processes the high scores stored in a table in an SQL database.

#!usrbin/perl
# The SQL database needs to have a table called highscores
# that looks something like this:
#
#   CREATE TABLE highscores (
#     game varchar(255) NOT NULL,
#     player varchar(255) NOT NULL,
#     score integer NOT NULL
#   );
#
use strict;
use CGI;
use DBI;
# Read form data etc.
my $cgi = new CGI;
# The results from the high score script will be in plain text
print $cgi->header("text/plain");
my $game = $cgi->param('game');
my $playerName = $cgi->param('playerName');
my $score = $cgi->param('score');
exit 0 unless $game; # This parameter is required
# Connect to a database
my $dbh = DBI->connect( 'DBI:mysql:databasename', 'username', 'password' )
	|| die "Could not connect to database: $DBI::errstr";
# Insert the player score if there are any
if( $playerName && $score) {
	$dbh->do( "insert into highscores (game, player, score) values(?,?,?)",
		undef, $game, $playerName, $score );
}
# Fetch the high scores
my $sth = $dbh->prepare(
	'SELECT player, score FROM highscores WHERE game=? ORDER BY score desc LIMIT 10' );
$sth->execute($game);
while (my $r = $sth->fetchrow_arrayref) {
	print join(':',@$r),"\n"
}