Re: widget_control from call_external

[davidf(at)dfanning.com (David Fanning)]

dominic@work.com (dominic@work.com) writes:

>   I have a c/c++ programme that is called from within a 
>   widget hierachy via call_external.
> 
>   As the computations made take fairly long, I want to update 
>   a status bar with a 'Percentage complete' from the C-routine,
>   so the user doesn't get upset and thinks the programme died 
>   on him/her.
> 
>   How do I go about that???

Well, this will be difficult unless your can call your
C program in "chunks", or in some other way interrupt
it. It might be easier if you just know, in general,
how long it takes. Then you can set a "kitchen timer"
sort of progress indicator. As long as the cake is
baked by the time the timer goes off, no one seems
to care. :-)

You can see several ways to build such a progress
indicator here:

   http://www.dfanning.com/tips/show_progress.html

Cheers,

David
-- 
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155