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From: rabanes@uhccux.uhcc.Hawaii.Edu (Greg Rabanes)
Newsgroups: comp.sys.mac.programmer
Subject: Journaling Device Drivers
Message-ID: <9109@uhccux.uhcc.Hawaii.Edu>
Date: 24 Aug 90 05:11:57 GMT
Reply-To: rabanes@uhccux.UUCP (Greg Rabanes)
Organization: University of Hawaii
Lines: 56



I am currently tying to write a journaling device driver
and am having a few problems with it.  The programming
environment I am using is MPW and the language is MPW C.

1)  When creating the file from within the driver's "open"
routine I am using the File manager routine "create" (NOTE:
the lower case version included in the MPW C header file
<Files.h>).   My code goes as follows:

	char   fname[255] = "dezaley:user:journal4.dat";

	create(fname, vrefnum, fcreator, ftype);

Now the problem.  A file is being created but not with the
name or the directory I specified.  I get a file named some-
thing like &*&%&$^%@#%  on the default volume.

Now when I use these same declarations and calls from a plain
old C program, it works fine.

So, is there a way around this or am I doing something wrong?



2.)    Although I have the above problem, a file is created
and ultimately written to by my journaling device driver.
I believe that the data written to the file is in compliance
with what is specified in IM I-261.  That is, I am writting
both the Journal Code and the results of the call to the par-
ticular Event manager routine making the call.  A separate
program I have written verifies this. (I think?!)
	
Anyway,  if my above belief is true then how do I go about
playing back the recorded events?  According to IM, I must
set the system global variable JournalFlag to a negative number
 to tell the Event Manager that I am playing back a journal.
There must be more to it than that?  Do I write another driver
that does the playback?  If I do, then how does the Event Manager
 decode the file I have recorded the journal to?  


3.)  	Next is the matter of finding some documentation on 
journaling.  I have looked through the Macintosh Technical
Notes as well as the Inside Macintosh series but I could not
find much on this subject.   Are there any books or articles
which address this subject?


As you can see by now I am quite lost and any help would be
greatly appreciated.

				Mahalo (hawaiian for thanks)
				Mike Kanada
				c/o rabanes@uhccux.uhcc.hawaii.edu