X11 - IsWindow ?
lazarus / 32-Linux

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Dibo · 2010-08-26 15:39

Hi,

On windows, if I have handle to window (HWND), I can check if it
exists calling function:
IsWindow(window: HWND): Boolean

Is there a similar function in X11? I'm looking in xlib, xutil units
but I don't see anything interesting. I have some TWindow and I want
check if it still exists. Now I'm calling some XEvent and checking for
BadWindow X11 error code

Regards and sorry for English

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theo · 2010-08-26 15:47

I wrote some code to list and activate top-level windows:
http://www.theo.ch/lazarus/winlist.zip
Maybe it helps.

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Dibo · 2010-08-26 18:03

I have not found exactly such a function but I use
XGetWindowAttributes from your sources instead of checking events. At
the end I'm Checking for BadWindow. It's good for me. Thanks

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theo · 2010-08-26 22:56

It should be easy. You get a list of all toplevel windows.
This should be enough to check if a XID (HWND) exists:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i Function
IsWindow(XID:Cardinal):Boolean;var xwl:TXWindowList;beginxwl:=TXWindow
List.Create;xwl.UpdateWindowList;Result:=xwl.WindowList.IndexOf(XID)>-
1;xwl.free;end;

You can also check by window name.

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Dibo · 2010-08-27 08:17

Thanks!