Al'miev Il'dar wrote: > Hello, i am a beginner in X-Windows, i have a question: > > in the function XOpenDisplay(display_name), where > > display_name=hostname:displaynumber.screennumber, > > 1) does "hostname" mean a name of a computer, physically existing, > where it would be necessary to open a graphical applications (that is > a computer-client), or is it a computer-server ?
It's the name of the computer running the X server which the application wishes to use. > 2) what is "displaynumber" and "screennumber" in terms of physically > existing displays-screens and computer-client(s) and computer-server ? A "display" is an X server. You can run multiple X servers on a single computer. In the most common case, the computer arbitrates access to the keyboard, mouse and display, but it can also work if you have multiple keyboards/mice/displays, or if the X server is using "virtual hardware", e.g. Xvnc. > 3) what is the difference between the terms "display" and "screen" ? Each display is a separate X server, with a keyboard, mouse and one or more monitors. A screen corresponds to a single monitor on systems which don't split a single logical screen across all monitors. > 4) if display_name=NULL, then display is opened in the local > computer If you pass NULL as the display name, the value of the DISPLAY environment variable is used. This may or may not refer to the local system. > - this is implicit > designation of the local computer, How to provide display_name explicitly ? > that is > would it work for example: > > local:0.0 ? Omit the hostname for a local display, e.g. ":0" for the first X server running on the local host. If no hostname is given, the connection will be to a Unix-domain socket in /tmp/.X11-unix. If a hostname is used, the connection will be a TCP connection to port 6000 plus the display number on the specified host. A connection via a Unix-domain socket is more likely to succeed than one via TCP; X servers are often configured to ignore TCP connections as a security measure. It's also more efficient. > 3) is it possible to provide "hostname"=1.2.3.4. (which is an > IP-address), instead of the name of the computer ? Yes. -- Glynn Clements <[email protected]> _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.freedesktop.org/mailman/listinfo/xorg Your subscription address: [email protected]
