Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cmcl2!lanl!mikeg%monsoon.c3
From: mikeg%monsoon.c3@lanl.gov (Michael P. Gerlek)
Newsgroups: comp.windows.x
Subject: Re: XtConvert & SetValues for floats
Message-ID: <14000@lanl.gov>
Date: 24 Jul 89 22:05:07 GMT
References: <1600@bacchus.dec.com>
Sender: news@lanl.gov
Lines: 32

From article <1600@bacchus.dec.com>, by asente@decwrl.dec.com (Paul Asente):
> In article <1208@quintus.UUCP> pds@quintus.UUCP (Peter Schachte) writes:
>> I'm trying to convert strings to the appropriate argument types to be
>> put into the ArgList to be passed to XtCreateWidget() or
>> XtAppCreateShell(), so I don't have a widget yet to pass to XtConvert().
>> Can I pass it a NULL?
> 
> No.  When creating a widget the right thing is usually to pass in some
> other widget on the same display, usually the new widget's parent.  If
> you're creating the very first widget in the application you can't do
> conversions; create the widget then use XtSetValues.

I have a related problem: I've written a widget which needs to use
floats in it's resource list, but I can't get it to work quite right:

The initialize procedure assigns the correct default values, but when I
try to do a set_values after realizing the widget on the float resource
I get garbage (0).  And yet a parallel resource which I kludged into
using strings (manually converted into floats) for the same purpose
works fine. 

So, okay, I'm new to Xt -- what am I missing? Should I be declaring a
Converter? If so, _why_? I've R'ed the FM, and found no help.  And there
aren't any other widgets that use floats to look at for a hint.  Is
there something wierd about floats, or have I made a mistake in my code
somewhere [minimal test case +150 lines, too long to include here]?

Help! And thanks...

[  M.P.Gerlek (mikeg@watson.c3.lanl.gov)      "Unix is just Public     ]
[  Los Alamos Nat'l Lab / Merrimack College       Domain VMS."         ]
[  Disclaimer: Yes, Mom, I'll play nice.             -anonymous        ]