A subcommand of [Tk]'s [winfo] command.
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http://www.purl.org/tcl/home/man/tcl8.5/TkCmd/winfo.htm
: '''[winfo] id''' ''window''
Returns a hexadecimal string giving a low-level platform-specific identifier for ''window''. On Unix platforms, this is the X window identifier. Under Windows, this is the Windows HWND. On the Macintosh the value has no meaning outside Tk.
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Notice that the return value of [[winfo id ...]] is the id used
by [toplevel] and [wish] in
toplevel ... -use $id
and
wish ... -use $id
Here's an example:
label .t1 -text Above
label .t2 -text Below
frame .holder -container 1
pack .t1 .holder .t2
exec wish other_application.tcl -use [winfo id .holder] &
[[Include an image here.]]
Incidental remark: when [CL] substitutes
exec tclkit tiny.tcl -use [winfo id .holder] &
for that last line, while running on WinNT, with tiny.tcl having content
pack [.button -text "Push me" -command exit]
everything comes up OK. When the button is pushed, "Dr. Watson"
appears. Dismissing it eventually results in a whited-out frame
"hole" in the embedding Wish. Is this an error in Tclkit 8.4a3?
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Is it a bug, that the results of winfo id and xwininfo differ in the window id exactly by one ?
No, it isn't, from the [toplevel] page:
DKF notes that, "toplevels on UNIX/X are really a collection of several windows; the window you draw on (which is what winfo id will tell you), another window for a menubar (if you've installed one) and a third one to contain the other two. If you do xwininfo -tree you should be able to find out what's really going on."
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**See also**
* [wm frame]
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