Obtaining List of all Xorg Displays

Question

I would like to know how I can obtain a list of all Xorg displays on my system, along with a list of screens associated with each display. I spent some time looking through

Answer 1

Like netcoder wrote, the problem has two distinct parts:

1. Connection to the X server

   The process establishes a connection to an X server using XOpenDisplay(). The connection is torn down using XCloseDisplay(). netcoders code in this thread is a good example of how to do it correctly.

   As netcoder mentioned, the problem is that there is no reliable way find out which X servers a process can connect to. His code checks the typical location where the X sockets are, /tmp/.X11-unix/. That approach does not work at all if the user is remotely connected, for example via SSH (with X forwarding enabled). In that case there is really only the DISPLAY environment variable (and perhaps some trickery wrt. ~/.Xauthority files).

   Unfortunately, I do not know of any better method either. I personally prefer to use a per-user configuration file -- say ~/.application/displays --, where the user can list the server names the application should try to connect in the same format as the DISPLAY environment variable, in addition to the default one. It is not automatic (netcoder's code is), but this approach suits me better.

2. Finding out about the screens provided by an X server

   XScreenCount() will return the number of screens provided by the X server the process is currently connected to. If you only need the screen dimensions, follow netcoders example. For more detailed information, use XScreenOfDisplay(Display,index) to obtain the Screen pointers; 0 <= index < XScreenCount(Display).

   In C code, the macros ScreenCount() and ScreenOfDisplay() are usually a bit more efficient than the actual function calls.