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Old 06-04-2010, 08:14 AM   #1
jsjones85
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Question How to take a screenshot from another X server


Hi, I started a second X server and I am trying to take a screenshot of the original display from the second X server. This is what I have tried

import -window root -display :0 screenshot.png

If I run this from display :0 then all is fine, but if I run it from display :1, then I get an image that is almost all black (a few icons in the upper right shows up - namely the volume, laptop battery status, and wireless connection status - but that's it).

Can someone please tell me what I am doing wrong?

Thank you very much for your help.
 
Old 06-05-2010, 04:53 AM   #2
fruttenboel
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Quote:
Originally Posted by jsjones85 View Post
Hi, I started a second X server and I am trying to take a screenshot of the original display from the second X server. This is what I have tried

import -window root -display :0 screenshot.png

If I run this from display :0 then all is fine, but if I run it from display :1, then I get an image that is almost all black (a few icons in the upper right shows up - namely the volume, laptop battery status, and wireless connection status - but that's it).

Can someone please tell me what I am doing wrong?

Thank you very much for your help.
Olympus make very fine equipment for this.. )
 
Old 06-07-2010, 07:38 AM   #3
jsjones85
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Are you saying it is a problem with my machine?
 
Old 06-07-2010, 08:26 AM   #4
HasC
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Originally Posted by jsjones85 View Post
Are you saying it is a problem with my machine?
He's saying you can use an Olympus *photographic camera*
 
Old 06-08-2010, 10:43 AM   #5
theNbomr
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To me, this sounds like a bug, somewhere. In principle, I see nothing wrong with what you are trying to do, and that you get something captured suggests that your method is at least mostly right. What is the nature of your two X server setup? Are both X servers displaying concurrently, or is one of them 'backgrounded' (probably incorrect jargonolgy) while the other occupies the screen? I don't know exactly what your end goal is, but perhaps you can use an X virtual frambuffer, Xvfb as your second X server. It never displays on a screen, but does satisfy the requirements of X clients. Xvfb was developed for the purpose that it sounds like you're after.
One question that I had when I first read your post was about ownership of the X servers, and of the processes using the server(s). Not too sure how that matters exactly, but I feel certain that if the same uid owns both servers, you would stand a better chance of success. The question of X server authorization/security might come into play, I suppose. Sorry for being a bit vague; I'm kind of spitballing on that last part.

--- rod.

Last edited by theNbomr; 06-08-2010 at 10:44 AM.
 
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Old 06-09-2010, 05:31 AM   #6
jsjones85
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Thanks theNbomr! Xvfb is my ideal solution and I've checked that the screenshots work.
 
  


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