Attached is the Cabal file I used to build (it wasn't clear what license things are under so those fields are commented out).

Thanks a ton Rayan ... I am glad you liked it.

I've checked in the cabal file - I am not familiar with it though ... how exactly can I use it to build the project? Also, do you have an idea how it can be incorporated into GHCI - As in, the program should do a forkIO and in one thread, handle network and on the other prompt an interactive ghci shell that'll let one modify the screen buffer in an expressive way in haskell! Regards, Kashyap

maeder@leibniz:/local/maeder> git clone git@github.com: ckkashyap/Chitra.git Initialized empty Git repository in /local/maeder/Chitra/.git/ Permission denied (publickey). fatal: The remote end hung up unexpectedly maeder@leibniz:/local/maeder> git --version git version 1.7.1

What permission is needed? Christian

Oops, you can use git://github.com/ckkashyap/Chitra.git - sorry about that. You can also visit https://github.com/ckkashyap/Chitra Regards, Kashyap

Thanks, I cannot get it to run with my vncviewer (TightVNC Viewer version 1.3.9)

How should I call vncviewer and your Main binary?

./Main 200 200 5900 after this, the program should start listening to port 5900 You can check if things are fine by telneting to localhost:5900, you should see this - ck@ck-desktop:~/lab/Chitra$ telnet localhost 5900 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. RFB 003.003 After this, you can use vncviewer to connect to localhost (5900 is the default port for vnc)

P.S. after getArgs in Main.hs use case args of [x, y, p] -> ... _ -> putStrLn "usage: Main xres yres port"

instead of "!!"

Thanks Christian ... I've incorporated this. Regards, Kashyap

Maybe these messages are also important? Client Said :: "RFB 003.003" Sharing enabled SET PIXEL FORMAT called bpp = 32 depth = 24 big endian = 0 trueColor = 1 RED MAX = 255 GREEN MAX = 255 blueMax = 255 red shift = 16 green shift = 8 blue shift = 0 SetEncodings Command 14 0 FrameBufferUpdateRequest x=0, y=0 width =1, height=1 FrameBufferUpdateRequest x=1, y=0 width =99, height=1 FrameBufferUpdateRequest x=0, y=1 width =100, height=99 Main: <socket: 7>: hPutBuf: resource vanished (Connection reset by peer) Am 03.02.2011 18:43, schrieb Christian Maeder:

Am 03.02.2011 18:05, schrieb C K Kashyap:

...

ck@ck-desktop:~/lab/Chitra$ telnet localhost 5900 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. RFB 003.003

After this, you can use vncviewer to connect to localhost (5900 is the default port for vnc)

Right, a window seems to pop up very shortly before it fails for me as shown below:

Cheers Christian

maeder@leibniz:~> vncviewer localhost Connected to RFB server, using protocol version 3.3 No authentication needed Desktop name "Haskell Framebuffer" VNC server default format: 32 bits per pixel. Most significant byte first in each pixel. True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0 Warning: Cannot convert string "-*-helvetica-bold-r-*-*-16-*-*-*-*-*-*-*" to type FontStruct Using default colormap which is TrueColor. Pixel format: 32 bits per pixel. Least significant byte first in each pixel. True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0 ShmCleanup called Using shared memory PutImage Same machine: preferring raw encoding Unknown message type 120 from VNC server ShmCleanup called

Am 04.02.2011 07:27, schrieb C K Kashyap:

FrameBufferUpdateRequest x=0, y=0 width =1, height=1 FrameBufferUpdateRequest x=1, y=0 width =99, height=1 FrameBufferUpdateRequest x=0, y=1 width =100, height=99 Main: <socket: 7>: hPutBuf: resource vanished (Connection reset by peer)

I was not taking care of partial updates, I've taken care of it now. Btw, what vncviewer are you using?

After pulling in your changes and recompilation, your application runs as expected. Thanks a lot! Christian maeder@leibniz:~> uname -a Linux [...] 2.6.34.7-0.7-desktop #1 SMP PREEMPT [...] i686 i686 i386 GNU/Linux maeder@leibniz:~> vncviewer -h TightVNC Viewer version 1.3.9 Usage: vncviewer [<OPTIONS>] [<HOST>][:<DISPLAY#>] vncviewer [<OPTIONS>] [<HOST>][::<PORT#>] vncviewer [<OPTIONS>] -listen [<DISPLAY#>] vncviewer -help <OPTIONS> are standard Xt options, or: -via <GATEWAY> -shared (set by default) -noshared -viewonly -fullscreen -noraiseonbeep -passwd <PASSWD-FILENAME> (standard VNC authentication) -encodings <ENCODING-LIST> (e.g. "tight copyrect") -bgr233 -owncmap -truecolour -depth <DEPTH> -compresslevel <COMPRESS-VALUE> (0..9: 0-fast, 9-best) -quality <JPEG-QUALITY-VALUE> (0..9: 0-low, 9-high) -nojpeg -nocursorshape -x11cursor -autopass Option names may be abbreviated, e.g. -bgr instead of -bgr233. See the manual page for more information.

Hi, I've refined this further ... earlier, each framebuffer update involved sending the whole screen back, now, only the incremental changes are sent. Drawing on very large images are quick now!! Real fun will be when I can do rendering of graphics by typing things at the ghci prompt!!! https://github.com/ckkashyap/Chitra Feedback welcome!!! Regards, Kashyap