Path: utzoo!attcan!uunet!husc6!cmcl2!nrl-cmf!ames!pasteur!cory.Berkeley.EDU!dheller
From: dheller@cory.Berkeley.EDU (Dan Heller)
Newsgroups: comp.windows.x
Subject: Widget writing: XtGetValues()
Message-ID: <4859@pasteur.Berkeley.EDU>
Date: 5 Aug 88 06:56:53 GMT
Sender: news@pasteur.Berkeley.EDU
Reply-To: dheller@cory.Berkeley.EDU (Dan Heller)
Organization: University of California, Berkeley
Lines: 24

I've been having a problem with XtGetValues actually getting some
of my widget's values when called.  For exmple, I would create a
widget which has a char * field in it to represent a fairly dynamic
string (e.g. its value changes rather frequently).  I want to get
the value of the string, so I call:

    Arg arg;
    char buf[SIZE];

    XtSetArg(arg, XtNstring, buf);
    XtGetValues(widget, &arg, ONE);

However, the buffer never gets filled with the value of the string.
The funny thing is, this doesn't happen all the time -- some fields
of the widget can be gotten just fine.  I haven't been able to determine
a pattern yet.  A logical asumption at this time is that I shouldn't
expect XtGetValues to strcpy() the value into the buffer, but rather
to just set the value of the pointer passed to the value of the pointer
of the char *.  That means I'd have to pass the address of a char *
variable.  But this doesn't explain why it's not working for other
variables.  The only workaround I've found is to write a get_values_hook
function, test the "name" attributes and set the "values" by hand.
But this seems like it shouldn't be necessary.
Dan Heller	<island!argv@sun.com>