hey:
one of the problems im trying to solve is in my last post
java development is very expensive in terms of dev time and project budget

and for eai
perl could do things a lot faster
and with less difficulty


this site has java eai examples
http://tecfa.unige.ch/guides/vrml/examples/eai/

ok i havent tested these code pieces
thoughoughly but check it out
there are some differences in the way they currently work
mostly because there is no activex/pluing for perl!!
here is the java directory of code for changing rgb
http://tecfa.unige.ch/guides/vrml/examples/eai/rgb-change/
check out RGBChange.java its the core of it all
there is an html page there you should be able to load if you hava a vrml plugin:
say http://www.parallelgraphics.com/ plugin under windows

here is the perl code

# Very simple: just get the TouchSensor event and give
# a random color to the other box.

# NOTE - this does not work very well, at all!!!! Have
# to figure out how best to fix it. JAS.   


$PORT=90000;

use IO::Socket;

$server = IO::Socket::INET->new(Proto => 'tcp',
        LocalPort => $PORT,
        Listen => SOMAXCONN,
        Reuse => 1) or die("Can't set up server");
system("perl /usr/bin/freewrl t1.wrl -best -eai localhost:$PORT eai &"
+);


$sock = $server->accept();
$sock->autoflush(1);
 
sub getlines {
        print "jt1.pl getlines starting\n";
        my @arr;
        for(1..$_[0]) {
                print "jt1.pl EXPECTING ROW $_\n";
                my $str = <$sock>;
                chomp $str;
                print "jt1.pl GOT '$str'\n";
                push @arr, $str;
        }
        print "jt1.pl returning from getlines @arr\n";
        return @arr;
}

# Test the sample EAI protocol.

$a = <$sock>;
$sock->print("TJL EAI CLIENT 0.02\n");

$sock->print("1\nGN TS\n");
my @l = getlines(4);
# print "\njt1.pl ok, REAL node of TS is $l[3]\n\n";

$sock->print("2\nGN MAT\n");
my @m = getlines(4);
# print "\njt1.pl ok, node of MAT  is $m[3]\n\n";


# print "jt1.pl SENDING 3 RL $l[3] TouchTime XX\n";
$sock->print("3\nRL $l[3] touchTime XX\n");

my @l2 = getlines(4);
# print "jt1.pl - Touchtime returned @l2\n";
         


# XXX This is fragile - it breaks if user clicks quickly and two event
+s
# come before our response gets to them

while(@x = getlines(3)) {
        print "jt1.pl in while loop with @x\n";
        if($x[1] ne "XX") {die("Invalid ev '$x[1]'")}
        $sock->print("15\nSE $m[3] diffuseColor\n".(join ' ',map {rand
+} 0..2)."\n");
        #@y = getlines(4); 
        #print "jt1.pl finishing while loop with @y\n";
}
[download]

please keep in mind this is the first
implementation of perl eai in freewrl
no other vrml viewer/browser
has the capability of running perl...yet

hope that helps in understanding!


back in the day we didnt have no old school

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