Thank you for the input. Basically, I want to do some image
processing on the print contents - sharpen, scale, etc, then
display it. The rough idea is - ApplicationX is installed on a
system, and installs some thing (I don't know what this is - a
printer module possibly) such that ApplicationX is available as a
printer (locally only, possible?)
Then when the user prints from any application on that system, they
can select ApplicationX as the printer. Printing via ApplicationX
printer would launch my application, somehow hand it the print
contents, which would then image process the contents and display
it. I apologize if this is completely off the mark for a printer, I
am treading in unfamiliar territory...
thanks again,
Kris
On May 24, 2005, at 4:21 PM, Dave Camp wrote:
On May 24, 2005, at 12:07 PM, Kristine Larson wrote:
I am trying to determine the feasibility of the following:
- user prints from any application and selects my printer
- printing launches my application, which displays the content
being printed (nothing is actually "printed")
I am trying to gather together information as to whether this is
possible, how difficult, etc.
I would appreciate any advice as to where to start researching
this - I have read Introduction to the Mac OSX Printing System.
There seems to be a number of documents on printing... I am sure
I will eventually read the majority of them... but would like to
narrow down the field for this initial estimate. Should I be
looking at the CUPs / custom backend stuff, a printer module, a
ppd file...
all help appreciated,
thanks,
Kris
There are a number of technical hurdles you will have to overcome:
- The printing system typically runs filters as user "lp", not
the current user.
- There might be multiple users logged in (either via fast user
switching or ssh). If user "A" prints, how do you ensure your UI
is only displayed to that user?
- There might not be any local users logged in. The print job
might have been sent from another machine using Printer Sharing.
A better way to attack this would be if you could describe what it
is you are trying to accomplish (i.e. why do you need UI? what
does it do?) Then, someone here might be able to suggest
alternative ways of getting there.
Dave
---
In English, every word can be verbed.
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