I am seeing this error message when I run Firefox headless through selenium using xvfb. It turns out that the message was a red herring for me. The message is only a warning, not an error. It is not why Firefox was not starting correctly. The reason that Firefox was not starting for me was … Read more
export XAUTHORITY=$HOME/.Xauthority This fix worked for me
Your program works here. My guess is you have another modifier active, such as NumLock. GrabKey only works on the exact modifier mask. For example here is some (GPL) code from metacity window manager /* Grab/ungrab, ignoring all annoying modifiers like NumLock etc. */ static void meta_change_keygrab (MetaDisplay *display, Window xwindow, gboolean grab, int keysym, … Read more
After installing XQuartz you may add a symlink to your X11 installation folder by just entering ln -s /opt/X11/include/X11 /usr/local/include/X11 in terminal. That will fix the problem as well without changing any ruby script.
From the CLI you can use xwininfo -tree -root If you need to do this within your own code then you need to use the XQueryTree function from the Xlib library.
The only way I know to do this is to traverse the tree of windows until you find what you’re looking for. Traversing isn’t hard (just see what xwininfo -root -tree does by looking at xwininfo.c if you need an example). But how do you identify the window you are looking for? Some applications set … Read more
The way that X works is the same as the way any network program works. You have a server of some description (in this case, the X display server) which runs on a specific machine, and you have X clients (like firefox) that try to connect to that server to get their information displayed. Often … Read more