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LibVNCServer: a library for easy implementation of a RDP/VNC server.
Copyright (C) 2001 Johannes E. Schindelin
What is it?
-----------
VNC is set of programs using the RFB (Remote Frame Buffer) protocol. They
are designed to "export" a frame buffer via net. It is already in wide use
for administration, but it is not that easy to make a server yourself.
This has been changed by LibVNCServer.
There are two examples included:
- example, a shared scribble sheet
- pnmshow, a program to show PNMs (pictures) over the net.
The examples are not too well documented, but easy straight forward and a
good starting point.
How to use
----------
To make a server, you just have to initialise a server structure using the
function rfbDefaultScreenInit, like
rfbScreenInfoPtr rfbScreen =
rfbDefaultScreenInit(argc,argv,maxx,maxy,8,3,bpp);
You then can set hooks and io functions (see below).
You can use a blocking event loop, a background (pthread based) event loop,
or implement your own using the processEvents function.
Also, there is functionality included to draw a cursor (see below).
To start also an HTTP server (running on port 5800+display_number), you have
to set rfbScreen->httpdDir to a directory containing vncviewer.jar and
index.vnc (like the included "classes" directory).
Hooks and IO functions
----------------------
TODO
Cursor handling
---------------
The rfbCursor structure consists mainly of a mask and a source. The mask
describes, which pixels are drawn for the cursor (a cursor needn't be
rectangular). The source describes, which colour those pixels should have.
The standard is an XCursor: a cursor with a foreground and a background
colour (stored in backRed and similar with a range from 0-0xffff). The
arrays "mask" and "source" consist of byte padded rows in MSB order (i.e. a
10x4 cursor's mask has 2x4 bytes, because 2 bytes are needed to hold 10 bits).
It is very easy to make a cursor like this:
char* cur=" "
" xx "
" x "
" ";
char* mask="xxxx"
"xxxx"
"xxxx"
"xxx ";
rfbCursorPtr c=rfbMakeXCursor(4,4,cur,mask);
You can even set "mask" to NULL in this call and LibVNCServer will calculate
a mask for you.
There is also an array named "richSource" for colourful cursors. They have
the same format as the frameBuffer.
History
-------
LibVNCServer is based on Tridia VNC and OSXvnc, which in turn are based on
the original code from ORL/AT&T.
License
-------
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.dfdf
For help with OSXvnc, please visit http://www.osxvnc.com/.
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