releasing NSKeyedUnarchiver causes crash
releasing NSKeyedUnarchiver causes crash
- Subject: releasing NSKeyedUnarchiver causes crash
- From: Markus Spoettl <email@hidden>
- Date: Sun, 18 May 2008 00:51:14 -0700
Hi all,
once again I have a question I can't seem to figure out on my own.
I'm trying to implementing an NSDocument application, more
specifically the load/store part of it. It actually works as expected,
reading and writing my object graph to and from a file works fine. The
problem is that when releasing the NSKeyedUnarchiver instance used to
read the data, the application crashes - and I don't know why.
This is the exact code I'm using (tracks is an object that conforms to
< NSCoding >)
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
{
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]
initForWritingWithMutableData: data];
[archiver setOutputFormat: NSPropertyListBinaryFormat_v1_0];
[archiver encodeObject:tracks forKey: @"myobject"];
[archiver finishEncoding];
[archiver release];
return [data autorelease];
}
- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:
(NSError **)outError
{
*outError = nil;
NSKeyedUnarchiver *archiver;
archiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:
data];
// release current data
[tracks release];
tracks = [archiver decodeObjectForKey: @"myobject"];
[tracks retain];
[archiver release]; // <--- crash here, no crash if commented out
return YES;
}
The crash happens when [archiver release] is called. Since I own the
object I have to release it and in my understanding it should no
longer be necessary (the reading is finished at that point).
Furthermore Leaks reports a leak if archiver is not released (which
seem to be perfectly valid).
I've also tried [archiver autorelease] but that only delays the crash
a little.
I don't understand the mistake I'm making, please help. Thanks!
Regards
Markus
--
__________________________________________
Markus Spoettl
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