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Re: MCL - Publish & Subscribe
- To: DESIGNINTENT@AppleLink.Apple.COM (Design Intent Sftware,Morrissey,APD)
- Subject: Re: MCL - Publish & Subscribe
- From: firstname.lastname@example.org (Bill St. Clair)
- Date: Fri, 27 Nov 1992 16:22:11 -0600
- Cc: info-mcl
>We previously sent the message below to info-mcl. The code results with a "not
>a valid section type" error, which we cannot get around. Ideally, we are
>looking for a working example of publish and subscribe using MCL. If we cannot
>get this resolved in the next few weeks, the first release of our product will
>not have Publish and Subscribe. After our info-mcl message, we received
>requests from other MCL customers for a working example. Please help! Thank
>;;; Are there any examples of using publish and subscribe in MCL?
>;;; The following piece of code always gets error code -451 when
>;;; trying to create a new section. I've tried to subscribe to Excel and
>;;; Word editions with the same result. Can anyone tell me what's
>;;; wrong with it?
> (require-interface :appleevents)
> (require-interface :editions)
> (traps::_initeditionpack) ;; only run once
> (setf reply (make-record (:newsubscriberreply :storage :pointer)))
> (rset reply :newsubscriberreply.formatsmask (+ #$kpictformatmask
> (traps::_getlasteditioncontainerused (rref reply
> (traps::_newsubscriberdialog reply)
> (rlet ((kind :signed-byte)
> (mode :signed-integer)
> (id :signed-long)
> (section (:pointer (make-record section (:sectionrecord :storage
> (%put-byte kind #$stpublisher 0)
> (%put-long id 177 0)
> (%put-word mode #$sumautomatic 0)
> (let* ((code (traps::_newsection
> (rref reply :newsubscriberreply.container)
> (%null-ptr) ;;this document
> (format t "~%code=~a" code)
> ((ctlh (%get-ptr section)))
> (if (%null-ptr-p ctlh)
> (format t "~%have a null pointer")
> (format t "~%BINGO!"))
There are a couple of problems.
1) You need to use gestalt to check for the existence of the Edition
Manager before calling #_InitEditionPack. You should also check the
result of (#_InitEditionPack) to make sure that there was room in
the System heap for the Edition Manager to load.
2) I prefer the style of letting traps autoload to the style of
using require-interface and traps::_xxx. You use #$xxx for constants,
why not #_xxx for traps.
3) The "kind", "sectionID", and "initalMode" args to #_NewSection are
not VAR parameters. They should be passed directly as integers.
4) You allocated REPLY from the Mac heap with MAKE-RECORD, but never
freed that storage. Better to use RLET.
5) MCL has a bug that it passes byte parameters to stack traps
incorrectly. I am considering a patch for this, but in the meantime
you need to left shift such parameters 8 bits (the "kind" parameter
to #_NewSection is :signed-byte. _CallEditionOpenerProc & _CallFormatIOProc
also take a "selector" arg which is :unsigned-byte). This is probably
what confused you most.
I managed to create a new section to an edition that I created with
MicroSoft Word with the following code:
; Set true if the edition manager is loaded
; DEF-LOAD-POINTERS will make sure you check for and initialize
; the Edition Manager whenever your (saved) application opens.
(def-load-pointers *edition-manager-present* ()
(let ((res (ccl::gestalt #$gestaltEditionMgrAttr)))
(logbitp #$gestaltEditionMgrPresent res)
(eql 0 (#_InitEditionPack))))))
; Here's your code, prettied up a bit.
; I also changed the mode arg for #_NewSection to #$sumManual.
; To use #$sumAutomatic, you need to be prepared to process the
; "Section Read" AppleEvent (though it may not be sent until you
; #_AddSectionAliasPair. I don't know).
(defun new-subscriber-section ()
(error "There is no edition manager"))
(rlet ((reply :NewSubscriberReply
:formatsMask (+ #$kpictformatmask #$ktextformatmask))
(#_GetLastEditionContainerUsed (pref reply :newsubscriberreply.container))
(let ((code (#_newsubscriberdialog reply)))
(unless (eql 0 code) (ccl::%err-disp code))
(when (pref reply :newSubscriberReply.canceled)
(return-from new-subscriber-section nil))
(setq code (#_NewSection
(pref reply :newsubscriberreply.container)
(%null-ptr) ; no document
(ash #$stSubscriber 8) ; kind (left shifted for MCL bug)
177 ; id
#$sumManual ; mode
(unless (eql code 0)
(let ((result (%get-ptr section)))
(if (%null-ptr-p result)
(format t "~%have a null pointer")
(format t "~%BINGO!")