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I am currently working with Xvfb to grab the screenshots of my programs. Is there a way to determine the number and the names of the windows that are currently "displayed" in Xvfb?

I also appreciate some reading resources!

Thanks, Heinrich

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2 Answers

up vote 3 down vote

If you run a window manager on the Xvfb display, you can use whatever features it has to list window information.

On the command line, wmctrl can show some window information.

DISPLAY=:1 wmctrl -l
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xwininfo -root -tree

See the xwininfo man page for more information.

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Thanks a lot. It is a very useful information. Do you know a way to get these information in C/C++ (without parsing the command outputs) ? – Heinrich Nov 3 '10 at 13:10
You could call XQueryTree yourself, as the older versions of xwininfo do, or the xcb equivalents as the new versions do. – alanc Nov 3 '10 at 14:18
Do you think it is an advantage to use xcb? As far as I read it's a low level access to the X11 protocol. Also, the API doesn't look as comfortable as using the X11 libs. – Heinrich Nov 3 '10 at 16:10
Well, I did when I modified xwininfo to use xcb, but that was as much to serve as an xcb example & test code as for the actual benefits. blogs.sun.com/alanc/entry/porting_xwininfo_to_xcb has a much longer explanation than I can provide here. – alanc Nov 3 '10 at 20:13

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