'=?UTF-8?B?WGxpYjogY2FwdHVyZSBzY3JlZW4gaW4gc2VwYXJhdGUgeHNlcnZlciBzZXNz?= =?UTF-8?B?aW9u?='

[prev in list] [next in list] [prev in thread] [next in thread] 

List:       freedesktop-xorg
Subject:    =?UTF-8?B?WGxpYjogY2FwdHVyZSBzY3JlZW4gaW4gc2VwYXJhdGUgeHNlcnZlciBzZXNz?= =?UTF-8?B?aW9u?=
From:       Alex Sviridov <ooo_saturn7 () mail ! ru>
Date:       2017-02-07 18:47:43
Message-ID: 1486493263.856872222 () f256 ! i ! mail ! ru
[Download RAW message or body]

[Attachment #2 (multipart/alternative)]

[Attachment #4 (text/plain)]

Hi all.

I need to run some-program which makes screen capturing via xlib library in separate \
xserver session. So, I start my ubuntu 14 and `origin` xserver session (lets call it \
this way) starts. After that I run

    startx some-program
After running this command a black screen appears and on this black screen I see my \
program and it works as expected. That's ok - this is what I need. 

However, firstly I want to continue using my computer and secondly I must run N such \
programs in N separate xserver sessions. The problem is that when I try to return to \
my `origin` session by pressing ctrl+alt+f7 some-program continues working however, \
its screen captures become simple black rectangles (no any content).

This is my code of some-program using which I capture screen:

    Display* display = XOpenDisplay(NULL);
    Window root = DefaultRootWindow(display);
    XWindowAttributes attributes = {0};
    XGetWindowAttributes(display, root, &attributes);
    int width, height;
    width = attributes.width;
    height = attributes.height;
    XImage* img = XGetImage(display, root, 0, 0 , width, height, AllPlanes, ZPixmap);
    ...
    XDestroyImage(img);

Could anyone say what should I do in order to capture screen in separate xserver \
session while it is not active (the user is using another xsession).

-- 
Alex Sviridov

[Attachment #5 (text/html)]

<HTML><BODY>Hi all. I need to run some-program which makes screen capturing \
via xlib library in separate xserver session. So, I start my ubuntu 14 and `origin` \
xserver session (lets call it this way) starts. After that I \
run &nbsp;&nbsp;&nbsp; startx some-program After running this command a \
black screen appears and on this black screen I see my program and it works as \
expected. That's ok - this is what I need. However, firstly I want to \
continue using my computer and secondly I must run N such programs in N separate \
xserver sessions. The problem is that when I try to return to my `origin` session by \
pressing ctrl+alt+f7 some-program continues working however, its screen captures \
become simple black rectangles (no any content). This is my code of \
some-program using which I capture screen: &nbsp;&nbsp;&nbsp; Display* display \
= XOpenDisplay(NULL); &nbsp;&nbsp;&nbsp; Window root = \
DefaultRootWindow(display); &nbsp;&nbsp;&nbsp; XWindowAttributes attributes = \
{0}; &nbsp;&nbsp;&nbsp; XGetWindowAttributes(display, root, \
&amp;attributes); &nbsp;&nbsp;&nbsp; int width, height; &nbsp;&nbsp;&nbsp; \
width = attributes.width; &nbsp;&nbsp;&nbsp; height = \
attributes.height; &nbsp;&nbsp;&nbsp; XImage* img = XGetImage(display, root, 0, 0 \
, width, height, AllPlanes, ZPixmap); &nbsp;&nbsp;&nbsp; ... &nbsp;&nbsp;&nbsp; \
XDestroyImage(img); Could anyone say what should I do in order to capture \
screen in separate xserver session while it is not active (the user is using another \
xsession). -- Alex Sviridov</BODY></HTML>

[Attachment #6 (text/plain)]

_______________________________________________
xorg@lists.x.org: X.Org support
Archives: http://lists.freedesktop.org/archives/xorg
Info: https://lists.x.org/mailman/listinfo/xorg
Your subscription address: %(user_address)s

[prev in list] [next in list] [prev in thread] [next in thread] 