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