Re: @class

FROM : Andrew Farmer
DATE : Sun Mar 23 12:07:09 2008

On 23 Mar 08, at 03:28, Audun Frøysaa wrote:
> Hello.
> I need some help with different controllers.


You seem confused. Is this your first Cocoa project? If so, have you 
run through the CurrencyConverter tutorial?

> I have
> mainController.h & .m
> iTunesMainController.h & .m
>
> I then tries to access a method in the iTunesMainController from the 
> mainController.


First things first: How are these two objects instantiated? How are 
they connected to each other? Simply declaring an instance variable 
(as you do below) doesn't create an object.

Also, as a point of style, most Cocoa programmers use the convention 
of capitalizing the first letter of class names to distinguish them 
from variable names.

> mainController.h
>
> @class iTunesMainController;
> @interface mainController : NSObject {
>     iTunesMainController *iTunes;


Per above, unless this is a stealth outlet, it never gets initialized.

> mainController.m
> #import "iTunesMainController.h"
> - (void)applicationDidFinishLaunching:(NSNotification *)notification{
> [iTunes setPlayMode:NO];
> }
>
> iTunesMainController.h i have this after the interface.
> - (void)setPlayMode:(BOOL)mode;
>
> iTunesMainController.m
> - (void)setPlayMode:(BOOL)mode
> {
>     BOOL stat;
>     if(mode == NO)
>     {
>      [[NSAppleScript alloc] initWithSource:@"tell application \"iTunes
> \" to stop"];
>         stat = NO;
>          
>     } else {
>         [[NSAppleScript alloc] initWithSource:@"tell application \"iTunes
> \" to play"];    
>         stat = YES;
>     }    
> }
>
> This doesn't work at all.


You're creating NSAppleScript instances, initializing them with 
scripts, and promptly leaking them. Surely you mean to be running 
them, placing them in a variable, and/or releasing them?

Also, I'm not sure what you're doing with the stat variable here. 
Setting its value within this function has no lasting effect._______________________________________________

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