Net::VNC - A simple VNC client

       Leon Brocard acme@astray.com

       Chris Dolan clotho@cpan.org

       Apple Remote Desktop authentication based on LibVNCServer

       Maurice Castro maurice@ipexchange.com.au

       Many thanks for Foxtons Ltd for giving Leon the opportunity to write the original version of this module.

       Copyright (C) 2006, Leon Brocard

       This module is free software; you can redistribute it or modify it under the same terms as Perl itself.

perl v5.34.0                                       2022-06-16                                      Net::VNC(3pm)

Bitdepth
       We do not yet support 8-bit true-colour mode, which is commonly supported by servers but is rarely
       employed by clients.

   Byteorder
       We have currently tested this package against servers with the same byte order as the client.  This might
       break with a little-endian server/big-endian client or vice versa.  We're working on tests for those
       latter cases.  Testing and patching help would be appreciated.

   Efficiency
       We've implemented a subset of the data compression algorithms supported by most VNC servers.  We hope to
       add more of the high-compression transfer encodings in the future.

       Virtual Network Computing (VNC) is a desktop sharing system which uses the RFB (Remote FrameBuffer)
       protocol to remotely control another computer. This module acts as a VNC client and communicates to a VNC
       server using the RFB protocol, allowing you to capture the screen of the remote computer.

       This module dies upon connection errors (with a timeout of 15 seconds) and protocol errors.

       This implementation is based largely on the RFB Protocol Specification,
       <http://www.realvnc.com/docs/rfbproto.pdf>.  That document has an error in the DES encryption
       description, which is clarified via <http://www.vidarholen.net/contents/junk/vnc.html>.

new
       The constructor. Given a hostname and a password returns a Net::VNC object:

         my $vnc = Net::VNC->new({hostname => $hostname, password => $password});

       Optionally, you can also specify a port, which defaults to 5900. For ARD (Apple Remote Desktop)
       authentication you must also specify a username.  You must also install Crypt::GCrypt::MPI and
       Crypt::Random.

   login
       Logs into the remote computer:

         $vnc->login;

   name
       Returns the name of the remote computer:

         print $vnc->name . ": " . $vnc->width . ' x ' . $vnc->height . "\n";

   width
       Returns the width of the remote screen:

         print $vnc->name . ": " . $vnc->width . ' x ' . $vnc->height . "\n";

   height
       Returns the height of the remote screen:

         print $vnc->name . ": " . $vnc->width . ' x ' . $vnc->height . "\n";

   capture
       Captures the screen of the remote computer, returning an Image::Imlib2 object:

         my $image = $vnc->capture;
         $image->save("out.png");

       You may call capture() multiple times.  Each time, the $image buffer is overwritten with the updated
       screen.  So, to create a series of ten screen shots:

         for my $n (1..10) {
           my $filename = sprintf 'snapshot%02d.png', $n++;
           $vnc->capture()->save($filename);
           print "Wrote $filename\n";
         }

   depth
       Specify the bit depth for the screen.  The supported choices are 24, 16 or 8.  If unspecified, the
       server's default value is used.  This property should be set before the call to login().

   save_bandwidth
       Accepts a boolean, defaults to false.  Specifies whether to use more CPU-intensive algorithms to compress
       the VNC datastream.  LAN or localhost connections may prefer to leave this false.  This property should
       be set before the call to login().

   list_encodings
       Returns a list of encoding number/encoding name pairs.  This can be used as a class method like so:

          my %encodings = Net::VNC->list_encodings();

   send_key_event_down
       Send a key down event. The keys are the same as the corresponding ASCII value. Other common keys:

         BackSpace 0xff08
         Tab 0xff09
         Return or Enter 0xff0d
         Escape 0xff1b
         Insert 0xff63
         Delete 0xffff
         Home 0xff50
         End 0xff57
         Page Up 0xff55
         Page Down 0xff56
         Left 0xff51
         Up 0xff52
         Right 0xff53
         Down 0xff54
         F1 0xffbe
         F2 0xffbf
         F3 0xffc0
         F4 0xffc1
         ... ...
         F12 0xffc9
         Shift (left) 0xffe1
         Shift (right) 0xffe2
         Control (left) 0xffe3
         Control (right) 0xffe4
         Meta (left) 0xffe7
         Meta (right) 0xffe8
         Alt (left) 0xffe9
         Alt (right) 0xffea

         $vnc->send_key_event_down('A');

   send_key_event_up
       Send a key up event:

         $vnc->send_key_event_up('A');

   send_key_event
       Send a key down event followed by a key up event:

         $vnc->send_key_event('A');

   send_key_event_string
       Send key events for every character in a string:

         $vnc->send_key_event_string('Hello');

   send_pointer_event($button_mask,$x,$y)
       Send pointer event (usually a mouse). This is used to move the pointer or make clicks or drags.

       It is easier to call the "mouse_move" or <mouse_click> methods instead.

   mouse_move_to($x,$y)
       Send the pointer to the given position. The cursor instantly jumps there instead of smoothly moving to
       there.

   mouse_click
       Click on current pointer position.

   mouse_right_click
       Right-click on current pointer position.

       Net::VNC - A simple VNC client

         use Net::VNC;

         my $vnc = Net::VNC->new({hostname => $hostname, password => $password});
         $vnc->depth(24);
         $vnc->login;

         print $vnc->name . ": " . $vnc->width . ' x ' . $vnc->height . "\n";

         my $image = $vnc->capture;
         $image->save("out.png");