Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!uw-june!wolf.cs.washington.edu!slh
From: slh@wolf.cs.washington.edu (Scott Heyano)
Newsgroups: comp.windows.x.motif
Subject: Re: trouble with structures and callbacks
Message-ID: <13837@june.cs.washington.edu>
Date: 23 Nov 90 22:21:23 GMT
References: <2450@kiwi.mpr.ca>
Sender: news@cs.washington.edu
Reply-To: slh@wolf.cs.washington.edu (Scott Heyano)
Organization: Computer Science & Engineering, U. of Washington, Seattle
Lines: 25

In article <2450@kiwi.mpr.ca> baker@mprgate.mpr.ca (Sue Baker) writes:
[stuff]
|
|    XtAddCallback(update, XmNactivateCallback, get_text, text);
|
|within the "get_text" function, i receive "text" as "textwidget" 
|and i can access textwidget.widget_array[0] with no trouble, but 
|i get a segmentation fault when i try to access any other element 
|of textwidget.widget_array.
	DAMNIT, you can only pass the POINTER TO THE STRUCTURE,
	NOT the actual structure.
	So only the first 32-bits are passed, in this case
	the first Widget in the array.
	So what you want is:
	    XtAddCallback(update, XmNactivateCallback, get_text, &text);
	and:
	    textwidget->widget_array[0]
|
|so, 
|1) why can't i access my structure in this manner?
|2) how can i make my structure accessible to my callback function?
|
|thank you in advance for any help in this matter.
|sue
|baker@mprgate.mpr.ca