| Re: WINDOW, /PIXMAP Question [message #32571] |
Tue, 22 October 2002 17:13  |
William Daffer
Messages: 34
Registered: February 1999
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Member |
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Mostafa El-Kady <mostafa@atmos.colostate.edu> writes:
> Hello,
>
> I have a program that draws some graphics to an off-screen buffer then
> grab the image and save it to JPEG file. It runs fine on my SGI machine
> with IRIX 6.5.17.
>
> When I telnet from to the SGI from a Windows machine at home and run the
> program, it works as long as I leave my account at the SGI is till open.
> If I have logged out from the SGI and tried the program by telnet from
> home, it crashes at the statement:
>
> WINDOW, /PIXMAP, /FREE
>
> and give the following error:
> % WINDOW: Unable to connect to X Windows display: 0.0
> % WINDOW: Unable to open X Windows display.
>
> Has anyone encountered similar problem and know a work-around?
>
I've had a similar problem. Your program needs access to the X
server, but if you aren't logged on at work your account doesn't
'own' the X server. The X authentication protocols won't allow the
non-owner of the server to connect. If the xdm prompt is up, I
suspect that 'root' owns the display, although I don't know for sure
and, of course, if some other user is logged in on console then that
user owns the console.
One work around is to leave yourself logged on at work. Another may
be to use a Z buffer, but this will restrict your work to 8-bit
color. This isn't as bad as it sounds, you can still do true color,
but you'll have to do the work one color plane at a time instead of
all at once as you could working with an X window. There may be a
third; go in and modify the appropriate system scripts to allow your
account access to the X server whoever is logged on. This last
alternative is something of a security hole. Finally another may be
turning off X authentication altogether, which allow *anyone*,
whether locally or via the network, to connect to the server. Most
likely a bad idea.
I have a similar situation, I need to process images and make
animations no matter who's logged in. I've written all my code so
that it doesn't need to connect to the X server. My entire project
is defeated, however, by a piece of SGI software, dmconvert, which I
use to transform a series of images into a quicktime movie. That
code makes a connection to the X server and I can't do without that
software. So I leave myself logged in so that my account can always
connect to the X server.
If anyone finds another way to do this, I'd appreciate a holler.
whd
--
RASCALITY, n. Stupidity militant. The activity of a clouded
intellect.
-- Ambrose Bierce: _The Devil's Dictionary_
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| Re: WINDOW, /PIXMAP Question [message #32574 is a reply to message #32573] |
Tue, 22 October 2002 12:51  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Mostafa El-Kady wrote:
> Hello,
>
> I have a program that draws some graphics to an off-screen buffer then
> grab the image and save it to JPEG file. It runs fine on my SGI machine
> with IRIX 6.5.17.
>
> When I telnet from to the SGI from a Windows machine at home and run the
> program, it works as long as I leave my account at the SGI is till open.
> If I have logged out from the SGI and tried the program by telnet from
> home, it crashes at the statement:
>
> WINDOW, /PIXMAP, /FREE
>
> and give the following error:
> % WINDOW: Unable to connect to X Windows display: 0.0
> % WINDOW: Unable to open X Windows display.
>
> Has anyone encountered similar problem and know a work-around?
>
> Thanks for the help.
I believe if you use the Z-Buffer Device
set_plot,'Z'
instead of
WINDOW, /PIXMAP, /FREE
you will not have this problem
You must try if it could be used as replacement,
because there are some differences in the coding.
regards
Reimar
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
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| Re: WINDOW, /PIXMAP Question [message #32665 is a reply to message #32571] |
Wed, 23 October 2002 06:59 |
K. Bowman
Messages: 330
Registered: May 2000
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Senior Member |
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> I have a similar situation, I need to process images and make
> animations no matter who's logged in. I've written all my code so
> that it doesn't need to connect to the X server. My entire project
> is defeated, however, by a piece of SGI software, dmconvert, which I
> use to transform a series of images into a quicktime movie. That
> code makes a connection to the X server and I can't do without that
> software. So I leave myself logged in so that my account can always
> connect to the X server.
Not surprisingly, if you have access to a Mac, there is a variety of
software that will convert images into QT movies. One of the best is
the professional-quality shareware program GraphicConverter. Write the
images from IDL in your favorite format (GIF/JPEG/PNG/raw). I use raw
or PNG. Convert the images to QT movies using the "graphics" or
"animation" codecs. Those QT codecs can be set to do lossless
compression; they are fast and simple; and they compress most scientific
graphics well (i.e., line art, not photographs).
Of course, you need a raster device (e.g., X or Z) to create the
original images in IDL.
Regards, Ken Bowman
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