Why does initWithCoder has other self-object?
Why does initWithCoder has other self-object?
- Subject: Why does initWithCoder has other self-object?
- From: Arno Oesterheld <email@hidden>
- Date: Wed, 17 Aug 2011 13:34:45 +0200
Hello,
I am a beginner with Xcode and Objective-C and stuck with a quite simple thing for over two days now. I hope you can help me.
My Project is deployed for OS X 10.6, it uses Garbage Collection and I am using Xcode 4.0.1.
I made a multi document application starting with the template provided by Xcode. I just have one class as subclass of NSDocument.
For opening documents I use initWithCoder. The decoding mithin this method works fine - I get the values that were saved.
But these values are "lost" when I would like to use them in an other method (of the same class).
I assume that I make some mistakes with using the right comibation of init: / initWithCoder: / initWithContentsOfURL: etc.
The self-object does always have a different adress in the initWithCoder method then in the other methods.
I tried plenty of combinations of the above methods and even tried to call differend methods in the super class (NSDocument) within initWithCoder.
This is my header file:
#import<Cocoa/Cocoa.h>
@interface OptimiererZwoMultiDoc : NSDocument<NSCoding> {
__strong struct bildanalyse {
float winkelo;
...
float skalfak; // Der Skalierungsfaktor, den dieses Bild erfahren muss damit es so gross ist wie das kleinste - Wert ist also immer<= 0
};
__strong struct bildanalyse *analyse;
__strong int16_t anzahlanalysewerte;
...
@private
NSTextView *ausgabe;
...
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification;
- (void) prepareAnalyseDoc;
...
@property (assign) IBOutlet NSTextView *ausgabe;
@property __strong struct bildanalyse *analyse;
@property __strong int16_t anzahlanalysewerte;
@end
When I try this implementation:
#import "OptimiererZwoMultiDoc.h"
@implementation OptimiererZwoMultiDoc
@synthesize ausgabe;
@synthesize analyse;
@synthesize anzahlanalysewerte;
...
- (id)init
{
self = [super init];
NSLog(@"init self=%@",self);
if (self) {
...
}
return self;
}
- (NSString *)windowNibName
{
NSLog(@"windowNibName self=%@",self);
return @"OptimiererZwoMultiDoc";
}
- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
NSLog(@"windowControllerDidLoadNib self=%@",self);
[super windowControllerDidLoadNib:aController];
}
- (BOOL) readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError{
NSLog(@"readFromData self=%@",self);
[NSKeyedUnarchiver unarchiveObjectWithData: data];
if (outError) {
*outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
}
return YES;
}
- (id) initWithCoder: (NSCoder *) coder{
struct bildanalyse tempAnalyse;
NSLog(@"initWithCoder self=%@",self);
anzahlanalysewerte = [coder decodeIntForKey:@"anzahlanalysewerte"];
....
return self;
}
then I get this output:
init self=<OptimiererZwoMultiDoc: 0x2002955a0>
readFromData self=<OptimiererZwoMultiDoc: 0x2002955a0>
initWithCoder self=<OptimiererZwoMultiDoc: 0x20028f5e0>
windowNibName self=<OptimiererZwoMultiDoc: 0x2002955a0>
windowControllerDidLoadNib self=<OptimiererZwoMultiDoc: 0x2002955a0>
As you can see, the object self is different in initWithCoder. Why? What's wrong with my code?
Any advice is very welcome.
Thank you very much in advance!
Best regards
Arno
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