Re: Problem with object communication

FROM : Ferdinand Svehla
DATE : Sat Nov 30 20:09:00 2002

Thankyou very much, Fritz!

You're solution worked perfectly for me - this was really giving me a
headache.
I am still unsure if my approach in dividing my application in serveral
parts and only let them talk together through the MainController is a
good one - but it is working now - thanks to you!

Am Samstag, 30.11.02, um 19:56 Uhr (Europe/Vienna) schrieb Fritz
Anderson:

> If MainController and MainWindowController depend on each other, the
> way to avoid circular dependencies is to use the @class directive in
> the header files, and import headers only in the implementation files.
> The @class directive tells the compiler that the indicated symbol will
> be used as a class name, with details to be supplied later.
>
> =====
> MainController.h:
>
> #import <Cocoa/Cocoa.h>
> @class MainWindowController;
>
> @interface MainController : NSObject {
>     MainWindowController *    window;
> ...
>
> =====
> MainWindowController.h:
>
> #import <Cocoa/Cocoa.h>
> @class MainController;
>
> @interface MainWindowController : NSWindowController {
>     MainController *    parent;
> ...
>
> =====
> MainController.m:
>
> #import "MainWindowController.h"
>
> @implementation MainController
> ....
>
> =====
> MainWindowController.m:
>
> #import "MainController.h"
>
> @implementation MainWindowController
> ....
>
>
>     -- F
>
> On Saturday, November 30, 2002, at 11:42  AM, Ferdinand Svehla wrote:
>
>> The problem is that i get compiler errors (parse error before) - i
>> think it is because i include in MainController.h in
>> MainWindowController.h and MainWindowController.h in MainController.h
>> (so that the compiler knows which object is capable of doing what)
>>
>>
>  --
> Fritz Anderson - Consulting Programmer - Chicago, IL
> Mail:        <<email_removed>>
> Risumi:    <http://resume.manoverboard.org>
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