jearls@polyslo.CalPoly.EDU ( Chumley The Troll ) (10/27/89)
I'm looking for an easy way to launch ProDOS 8 programs from the finder
but I need to be able to fill their startup buffers with info. I know
that BASIC.LAUNCHER does essentially this; is there any way to get the
source for this or to get some hints (tech notes?) on how to do this?
Thanks,
- John
--
_______________________________________________________________________________
Chumley@Bazaar.Deva.COM |
-aka- EARLSJ@AFAL-Edwards.AF.MIL | If two wrongs don't make a right,
-aka- jearls@polyslo.CalPoly.EDU | try three...dlyons@Apple.COM (David Lyons) (10/28/89)
In article <1989Oct27.053021.21003@polyslo.CalPoly.EDU> jearls@polyslo.CalPoly.EDU ( Chumley The Troll ) writes: >I'm looking for an easy way to launch ProDOS 8 programs from the finder >but I need to be able to fill their startup buffers with info. I know >that BASIC.LAUNCHER does essentially this; is there any way to get the >source for this or to get some hints (tech notes?) on how to do this? The information you need is all available--the trick is to locate it and piece it together. When you open a document in the GS Finder, the Finder checks for an Icon matching the documents name/type/auxtype. That icon specifies the pathname of the application to launch--the Finder puts a list of the name of the document you opened in a place where the application can find it, and then it launches that application. The place for that list is the MessageCenter, message #1. This is documented in the Apple IIgs Toolbox Reference manual, volume 2, in the Tool Locator chapter. Here's what you can do: create a small SYS application that will fetch the first pathname from message #1 of the MessageCenter and feed it to your real application's startup buffer (this is what BASIC.LAUNCHER does for BASIC.SYSTEM). Your SYS program will load at $2000, which is the same place your main application is going to have to be loaded, so you'll want to have your program copy itself (or part of itself) someplace else when it runs (like $1000). You'll have to check the MessageCenter (do action 2, get, on message 1) and get the first pathname, and delete the message from the MessageCenter. OPEN your real application and READ it into memory at $2000. CLOSE it. Stuff the pathname from the MC into your app's startup buffer at $2006, making sure it fits. (When you OPEN the thing, a good way to get the pathname is to take your own full or partial pathname from $0280, append it to the prefix if it doesn't begin with a "/", and strip off the filename. Then add the filename of the real application, and you've got the full pathname of the application you really want to open. If you do this right, you deal with all cases, including for ex. Prefix="/HARD1/ABC/" and your pathname at $280 = "DEF/GHI". This is allowed.) Finally, of course, JMP $2000 to execute the real application. -- --Dave Lyons, Apple Computer, Inc. | DAL Systems AppleLink--Apple Edition: DAVE.LYONS | P.O. Box 875 America Online: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.