Get a window handle knowing the PID of a third-party process in Linux
lazarus / 32-Linux

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prostor_7_7_7 · 2024-04-26 13:53

How is it possible in Lazarus(linux) to get a window handle knowing
the PID of a third-party process in Linux. Perhaps an analogue of the
function for Windows enumthreadwindows

I looked at the lclintf.pas module, there are some functions from
Winapi. But there is no getting a list of HWND windows, running
processes

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MarkMLl · 2024-04-26 14:24

Quote from: prostor_7_7_7 on April 26, 2024, 03:53:08 pmHow is it
possible in Lazarus(linux) to get a window handle knowing the PID of a
third-party process in Linux. Perhaps an analogue of the function for
Windows enumthreadwindows

I looked at the lclintf.pas module, there are some functions from
Winapi. But there is no getting a list of HWND windows, running
processes

With a lot of difficulty IMO since apart from anything else one PID
(on the client program) can be talking to multiple windows (on an X11
server... don't get me going about Wayland).

I've had some measure of success parsing the output of xwininfo and
xprop, in principle there must be lower-level libraries which could be
used but I've not worked out the details.

Code: [Select]A complete list of windows may be obtained using e.g.

xwininfo -tree -root | less

A name pattern may be searched from this, hence e.g.

0x520000c "Untitled * — Kate"

The window info may be obtained e.g.

xwininfo -id 0x520000c

The name may be verified and PID (assuming this is local etc.)
obtained e.g.

xprop -id 0x520000c WM_NAME _NET_WM_PID

Hence the screensaver may also be suspended

xdg-screensaver suspend 0x520000c

MarkMLl