NSKeyedUnarchiver questions
NSKeyedUnarchiver questions
- Subject: NSKeyedUnarchiver questions
- From: Scott Frankel <email@hidden>
- Date: Tue, 9 May 2006 20:51:55 -0700
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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