How can I create PDF Service with a cocoa-applescript (AppleScriptObjc) application? - applescript-objc

Question

I decided to be foolhardy and write my own Email PDF with GMail PDF service and learn AppleScriptObjC at the same time. I've got everything working, and except for actually being able to accept the file from the print dialog.
Here's what the code looks like so far:
script gmailpdfAppDelegate
property parent : class "NSObject"
property recipientField : missing value
property subjectField : missing value
property fromField : missing value
property passwordField : missing value
property messageField : missing value
property pdfFile : missing value
on ButtonHandlerCancel_(sender)
quit
end ButtonHandlerCancel_
on ButtonHandlerSend_(sender)
set recipient to recipientField's stringValue()
set subject to subjectField's stringValue()
set fromUser to fromField's stringValue()
set pw to passwordField's stringValue()
set message to messageField's stringValue()
set sendEmailScript to (current application's NSBundle's mainBundle()'s pathForResource_ofType_("sendEmail", "")) as string
set emailserverInfo to " -s smtp.gmail.com:587 -xu '" & fromUser & "' -xp '" & pw & "' -m '" & message & "' "
do shell script quoted form of sendEmailScript & " -t " & recipient & " -u " & subject & " -f '" & fromUser & "' " & emailserverInfo
quit
end ButtonHandlerSend_
on applicationWillFinishLaunching_(aNotification)
-- Insert code here to initialize your application before any files are opened
set fromField's stringValue to do shell script "defaults read org.ryancollins.GMail-PDF 'fromDefault'"
set passwordField's stringValue to do shell script "security 2>&1 >/dev/null find-generic-password -ga gmailpdf |ruby -e 'print $1 if STDIN.gets =~ /^password: \"(.*)\"$/'"
end applicationWillFinishLaunching_
on applicationShouldTerminate_(sender)
-- Insert code here to do any housekeeping before your application quits
set fromDefault to fromField's stringValue()
do shell script "defaults write org.ryancollins.GMail-PDF 'fromDefault' '" & fromDefault & "'"
set passwordDefault to passwordField's stringValue()
do shell script "security add-generic-password -a gmailpdf -s email -p '" & passwordDefault & "' -U"
return current application's NSTerminateNow
end applicationShouldTerminate_
end script
When compiled and added to the PDF Services folder I get this error (the app is named GMail PDF:
The document “Google News.pdf” could not be opened. GMail PDF cannot open files in the “Portable Document Format (PDF)” format.
How do I get an AppleScriptObjC application to accept the file?

Answer 1

Looks like you don't have any file-handling capabilities in your app yet, so you'll have to implement application:openFile: from NSApplicationDelegate:
From the NSApplicationDelegate documentation:
- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename
Which, in AppleScriptObjC, would be:
on application_openFile_(theApplication, filename)
-- your PDF handling code goes here
end application_openFile_

Answer 2

A simple alias of the application in the PDF Services folder should be enough to pass the PDF to the app.
Any script as a PDF Service will be sent 3 arguments: File title, job options, and path to the PDF.