Re: NSKeyedUnarchiver questions
Re: NSKeyedUnarchiver questions
- Subject: Re: NSKeyedUnarchiver questions
- From: Scott Frankel <email@hidden>
- Date: Wed, 10 May 2006 13:00:28 -0700
Current state: my app reads & writes binary data archived via
default implementations.
I reverted back to the default implementations of [NSKeyedArchiver
archivedDataWithRootObject:foo] and [NSKeyedUnarchiver
unarchiveObjectWithData:data]. At first, the app exhibited the same
crashing while reading the file, yielding this message in the log file:
Exception: EXC_BAD_ACCESS (0x0001)
The debugger, though, now shows that the array I unarchived into now
contains member objects. So it seems the app had at least 2 problems.
The other problem I have partially traced back to code intended to
manage undo of edits. (It exists in my -setFoo: method, called on
the unarchived data.) I'm still troubleshooting this issue; though I
can live without it for the moment.
I'm also living with binary archives until I get more familiar with
rolling my own output format.
Thanks for the suggestions!
Scott
On May 9, 2006, at 8:51 PM, Scott Frankel wrote:
I'm attempting to unarchive data my app has written to disk, but so
far have not had any luck. It dies leaving a signal 10 error.
The following snippet:
NSMutableArray *newArray;
newArray = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/absolute/
path/to/theFile.plist"];
yields newArray with zero content member items, as shown in the
debugger. Zilch.
Using NSFileManager methods, I confirm what an `ls -l` in the
terminal shows, that the file both exists and is readable. Using
`cat` in the terminal shows that the file contains what I believe
is valid data. (I archive it as human-readable ASCII characters
using [archiver setOutputFormat:NSPropertyListXMLFormat_v1_0];)
Any suggestions on how to debug this or docs that might point me in
the right direction would be greatly appreciated! I've already read:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/
ObjC_classic/Classes/NSKeyedUnarchiver_index.html#//apple_ref/doc/
uid/20000838.
Also, in reading the doc (above), I note 2 methods:
unarchiveObjectWithData and unarchiveObjectWithFile. What does it
mean to encode an object graph "in data," rather than "to a file?"
How would that data appear on disk? Does the former use the file
selected with the Save browser, where the latter uses hard-coded
paths? (A wild guess.) My document-based app attemps to make use of
- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)
aType.
Thanks in advance!
Scott
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