Testing for completion of print spooling?

[Bruce A. Pokras]

I am having a problem printing in OS X. In my app, the user will be 
able to create a list of files. The user then can print a file by 
clicking its name in the list. This initiates a Finder AppleScript 
that prints the file. However, if the user clicks a second file name 
before the first file has completely spooled (and the printer icon 
has disappeared from the Dock), then the last page of the first file 
is not printed.

Any ideas on how to detect the fact that a print job is still 
spooling and then either prevent the user from clicking further file 
names or holding up the start of any subsequent print jobs until the 
previous one has spooled?

Regards,

Bruce Pokras
Blazing Dawn Software
www.blazingdawn.com