Development of CUPS Filter

[alex at j2anywhere.com]

I want to write an print job interceptor which allows me to hold / accept print jobs after they have been submitted. I thought it would be a good idea to implement a filter which would initiate a popup window prompting me to accept / decline the print jobs. I also would like to provide some information of the print job in the popup windows.

Is this possible with a CUPS filter and is this the recommended approach.

I though it would be best to modify the PPD file used by the printer to include the filter as it would ensure the filter is used for all print jobs. Is this asumption correct ?

Where do I get the page count from for the job ?