Re: problem with NSUnarchiver
Re: problem with NSUnarchiver
- Subject: Re: problem with NSUnarchiver
- From: mmalcolm crawford <email@hidden>
- Date: Mon, 7 Mar 2005 09:38:36 -0800
On Mar 6, 2005, at 4:19 PM, simone gabbriellini wrote:
(1) loadData = [[NSMutableArray alloc]initWithCapacity:4];
(2) loadData = [NSUnarchiver unarchiveObjectWithData:newData];
and I have:
(3) loadData = [[coder decodeObject] retain];
in my initWithCoder function
the fact is that if I ask to print the array at point (1) I
obviusly obtain this ()
if I ask to printf the array at step (3) I got (ciao, come, stai,
"adesso?") - which is the content previusly saved, but when I
finally came to step (2) printf give me this result:
<MyDocument: 0x3b9090>
where is the content of my array? at this point, I'm not able to
retrive it...
The array is in an instance variable of the document instance...
In your archiving method:
On Mar 3, 2005, at 10:46 AM, simone gabbriellini wrote:
- (NSData *)dataRepresentationOfType:(NSString *)aType
{
// saving data
if([aType isEqualToString:@"invitiEase"]){
return [NSArchiver archivedDataWithRootObject:self];
}
return nil;
}
you archived the document, not the array.
The method should have been more like:
- (NSData *)dataRepresentationOfType:(NSString *)aType
{
// saving data
if([aType isEqualToString:@"invitiEase"]){
return [NSArchiver archivedDataWithRootObject:arrayInvito];
}
return nil;
}
That said, the approach you're taking to archiving in general is, to
say the least, peculiar. Your document class should not be
implementing NSCoding. The document typically manages either a root
model object or a collection of objects that are added to an archive
in dataRepresentationOfType: and extracted in
loadDataRepresentation:ofType:.
Given the other questions you are asking here, I would recommend that
you get hold of one of the introductory Cocoa texts and work through
that. Learning piecemeal by trial and error is unlikely to be the
most productive or rewarding experience.
mmalc
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