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Full Discussion: About "XmCreateMainWindow"
Operating Systems Linux About "XmCreateMainWindow" Post 302906183 by three_white on Tuesday 17th of June 2014 07:21:46 PM
Old 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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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)
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