On Mar 1, 2005, at 2:18 PM, Laurence Harris wrote:
On 2/28/05 11:02 PM, Dave Camp didst favor us with:
You might try asking about this on the printing list.
A reasonable suggestion on the surface, but I subscribed to the
printing
list and it appears that the only other person on it is some fellow
who's
out of the office until 3/7, at least according to his auto-response.
LOL
It's a very low traffic list. If you don't get an answer in a couple of
days, try reposting... The Apple engineers do answer questions there
but sometimes it takes a while.
It's possible you
might be able to manipulate the queue's directly with the CUPS API's,
but I've not looked at them from that aspect before.
I'm hoping for something that's simple. This doesn't sound simple. ;-)
The API's are documented in the built in CUPS web server which is
already running on your machine as a part of cupsd. The only other
documentation I'm aware of is the CUPS book by the same person that
wrote the CUPS software.
I'm going to speculate the problem you are seeing is due to the latency
between the time you queue up a job and when CUPS wakes up and runs the
queue. I don't know offhand if there is a way to force the queue to be
run in the order submitted vs. whatever order it normally runs jobs in
(possibly alphabetic with the spool files having lots of temp file like
strings of numbers in the file names).
If the file is already in a printable format (e.g. PDF), you might try
submitting the file directly to CUPS via cupsPrintFile(). I don't know
if that will yield better results. That reminds me... I don't think
<cups.h> is installed by default. If not, you will need to grab the
source from the Darwin site.
Good luck!
Dave
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