XtNameToWidget, XtWindowToWidget - translating strings to widgets or
widgets to windows
Widget XtNameToWidget(Widget reference, String names);
Widget XtWindowToWidget(Display *display, Window window);
display Specifies the display on which the window is defined.
names Specifies the fully qualified name of the desired widget.
reference Specifies the widget from which the search is to start.
window Specify the window for which you want the widget.
The XtNameToWidget function looks for a widget whose name is the first
component in the specified names and that is a pop-up child of
reference (or a normal child if reference is a subclass of
compositeWidgetClass). It then uses that widget as the new reference
and repeats the search after deleting the first component from the
specified names. If it cannot find the specified widget,
XtNameToWidget returns NULL.
Note that the names argument contains the name of a widget with respect
to the specified reference widget and can contain more than one widget
name (separated by periods) for widgets that are not direct children of
the specified reference widget.
If more than one child of the reference widget matches the name,
XtNameToWidget can return any of the children. The Intrinsics do not
require that all children of a widget have unique names. If the
specified names contain more than one component and if more than one
child matches the first component, XtNameToWidget can return NULL if
the single branch that it follows does not contain the named widget.
That is, XtNameToWidget does not back up and follow other matching
branches of the widget tree.
The XtWindowToWidget function translates the specified window and
display pointer into the appropriate widget instance.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface