06-17-2014
About "XmCreateMainWindow"
Hi, I'm dealing with a problem on Linux (Red Hat 4.4.7-4) which is related to X window system. In my program, I use:
"main_w = XmCreateMainWindow (toplevel, "main_w", NULL, 0);"
to create a main window and I find that the window id value of the first child of main_w is a very large integer "267110801680". I use the command below to find this number when I debug it in DDD:
print *(((CompositeWidget) main_w)->composite)->children[0]
This large integer results in a memory problem when I use Valgrind to check the memory leakage which is "Invalid read".
The abnormal large integer should be a return value from "XmCreateMainWindow" and is it related to my operating system?
BR
Dong
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LEARN ABOUT X11R4
xtwindowtowidget
XtNameToWidget(3) XT FUNCTIONS XtNameToWidget(3)
NAME
XtNameToWidget, XtWindowToWidget - translating strings to widgets or widgets to windows
SYNTAX
Widget XtNameToWidget(Widget reference, String names);
Widget XtWindowToWidget(Display *display, Window window);
ARGUMENTS
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.
DESCRIPTION
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 ref-
erence (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.
SEE ALSO
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.0.5 XtNameToWidget(3)