How to get an X11 Window from a Process ID?

Question

Under Linux, my C++ application is using fork() and execv() to launch multiple instances of OpenOffice so as to view some powerpoint slide shows. This part works.

Ne

Answer 1

Check if /proc/PID/environ contains a variable called WINDOWID

Answer 2

Bit late to the party. However: Back in 2004, Harald Welte posted a code snippet that wraps the XCreateWindow() call via LD_PRELOAD and stores the process id in _NET_WM_PID. This makes sure that each window created has a PID entry.

http://www.mail-archive.com/devel@xfree86.org/msg05806.html