Re: New to gnome-print, but stumbled on something I find odd

[Aaron Ballman <aaron realsoftware com>]

> To explain what is happening: the  value with key
> GNOME_PRINT_KEY_PAPER_WIDTH may in fact contain a string such as 8in or
> 8cm. When you are asking for a double you get 8 independent from the
> unit. When the user changes the preferred unit that does not change the
> values stored since if the user changes back you want the exact value
> the user entered not just some approximation.

Thanks for the explanation, this makes perfect sense to me.  :-)  I 
am still running into a stumbling block though.

So I made a GnomePrintUnit using new and I call 
gnome_print_config_get_length on what I'm interested in, but I guess 
I am stuck trying to figure out a decent way to convert this unit 
into Points.  It looks like (from reading the header file, since 
that's the only documentation I've really found on the topic) there 
should be a way to convert from one unit type to another.  I can do 
the conversion myself by hand, but why reinvent the wheel?  ;-)

Here is the code I am using currently (val is a const guchar * and 
mCurrentConfig is a valid GnomePrintConfig object):

gdouble first = 0.0;
GnomePrintUnit *unit = new GnomePrintUnit;

// Get the double value that we want along with the units it is expressed in
gnome_print_config_get_length( mCurrentConfig, val, &first, &unit );


Here's where I get stuck.  Do I need to look at unit->abbr and 
compare it to "mm", "in", etc and then do the conversion by hand.  Or 
is there some trick I can do by using unit->unittobase to convert 
automatically from one type to another?  Ideally, I just want all my 
return values in pixels (so it'd be resolution-dependant), but I can 
live with them all being in Points as well.

Any suggestions would be very appreciated.  Also, if you know of a 
decent place for documentation that google hasn't yielded me yet, 
that would help me out immensely.  Thanks!

~Aaron
--
Handy UNIX Commands:

sudo grep -e "My mind" -H -r /
mv /mnt/fuji /mnt/everest
mv "Ignorance" /dev/null