Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!usc!ucsd!ucbvax!UTCVM.BITNET!JWANKERL
From: JWANKERL@UTCVM.BITNET ("Josef W. Wankerl")
Newsgroups: comp.sys.apple
Subject: GS/OS file copying
Message-ID: <8911181612.AA15334@apple.com>
Date: 18 Nov 89 15:50:14 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 43


     I am in the process of writing a program in assembly language that
will be able to copy GS/OS extended files.  I want to be able to copy
either the data fork, resource fork, or both.  I've run into a blank wall
on a few major points so I'm about to list a few technical questions.
Oh yeah, my GS/OS reference book is not the Apple one(s), it's Gary
Litle's Exploring Apple GS/OS and ProDOS 8.  So here are a few questions:

 * How would I go about allocating memory for the copy?  I have an idea to
find the maximum block size and if it's not enough then compact memory and
try again, and if it's still not enough then I'll have to ask for the new
maximum block size and then read in chunks of that size.  I haven't done
this yet because I think there might be a beter way.  Is there?

 * How do I actually copy the file?  I seem to remember a few messages back
an algorithm to OPEN source file data READ source file data CREATE target file
Write target file data CLOSE source file data OPEN source file resource
READ source file resource CLOSE source file resource OPEN target file resource
WRITE target file resource SETFILEINFO on target file CLOSE target resource
CLOSE target data.  Is that even close?  I think I remember you have to have
the target file open and set the file attributes when it's open because
when it is closed on an AppleTalk drop folder then it's not accessable
anymore.  Will my algorithm work correctly?

If you know the answers to any or all of the above questions, please
let me know as I'm anxious to finish up my project and move on to
another part of it.

Oh yes, one more question before I go (not related to file copying)

 * Is there a method for a NDA to open some windows that are controlled
by the NDA?  I don't believe I've ever seen this done before so I'm not
sure if it can be.  I guess I'd have to make the window a system window
but I'm now sure how things would react if the application it's running
under closes it.  Any answers to this one, either?

  -Gonzo

/**********************************************************************\
|*      Joe "Gonzo" Wankerl       |*|  The views expressed here are   *|
|* BITNET =>  JWANKERL@UTCVM      |*|  not necessarily yours...       *|
|*                                |*|         ...but they should be.  *|
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