how to access global instance/variable via delegate?

[interdev]

Hello everyone

I prefer to access the global instance/variable via delegate. ( I do not like the mode as 'extern NSInteger myInstance')

This means that all global instances/variables are in a delegate object. In cocoa touch, I know I can use

appDelegate =(AppDelegate *)[[UIApplication sharedApplication] delegate];
UIApplication *app=[UIApplication sharedApplication];
appDelegate.myInstance=1;

to access the global instance(myInstance), but I am not sure if it is same as the mode in Cocoa.

So I try to using codes below

//the application in MainMenu.XIb set to Ojbect 'AppDelegate'

#import <AppKit/AppKit.h>
#import <CoreData/CoreData.h>
#import <Cocoa/Cocoa.h>
#import "rootWindowController.h"

@class AppController;

@interface AppDelegate :NSApplication{


IBOutlet AppController *vAppController;
NSInteger NSInteger myInt;;

}
@property (retain,nonatomic)IBOutlet AppController *vAppController;

@property (assign,nonatomic) NSInteger myInt;;


@end



@implementation AppDelegate


@synthesize vAppController;
@synthesize myInt;

- (void)applicationDidFinishLaunchingNSNotificatio n *)notification{

}


- (void)dealloc {

[vAppController release];
[super dealloc];
}



#import <Foundation/Foundation.h>

@class AppDelegate;
@interface AppController : NSObject {

AppDelegate *appDelegate;
}
@property (retain,nonatomic) AppDelegate *appDelegate;

@end


//

#import "AppController.h"


@implementation AppController
@synthesize appDelegate;

-(id)init
{

NSApplication *app=[NSApplication sharedApplication];

appDelegate =(AppDelegate *)[app delegate];
[super init];//a: I set the breakpoint here and check the value of appDelegate


appDelegate.nyInt=0;

}
- (void)dealloc {


[appDelegate release];

[super dealloc];
}




@end

Then I drag a NSObject to MainMenu.xib and set to type AppController.
I set the AppDelegate outlet delegate to the AppController,
vAppController in AppDelegate links to the AppController also.
I set the breakpoint at A, but I found that

NSApplication *app always work well, but appDelegate always returns 0x0.

This means that no object was initialized for appDelegate.

I stick on the problem for 2,3 days, still no solution.

Welcome any comment

Thanks

interdev

[Tambourin]

Why not just put your variables in NSApplication