RE: Newbie - inter object method invocation
RE: Newbie - inter object method invocation
- Subject: RE: Newbie - inter object method invocation
- From: <email@hidden>
- Date: Fri, 21 Jun 2002 00:03:00 +0200
- Thread-topic: Newbie - inter object method invocation
OK, I get that, but when the program runs, doesn't it create an instance of the ProcessController class then?? Can't I target that one?? I must be seriously missing an oversight here....
Alex
-----Original Message-----
From: John Anderson [
mailto:email@hidden]
Sent: Thu 6/20/2002 11:47 PM
To: Alexander Griekspoor
Cc: email@hidden
Subject: Re: Newbie - inter object method invocation
You're sending a message to the ProcessController class itself... the
way you have it set up, you need to send the message to an *instance*
of the ProcessController class.
John Anderson
On Thursday, June 20, 2002, at 02:24 PM, <email@hidden> wrote:
>
Hello all,
>
>
I've got one more big "I don't get it" block, which I'm afraid might
>
be obvious for experienced programmers. So if you hate newbie
>
questions, please skip this email, but anyone who has some time to
>
help me overcome this problem, thanks a alot in advance!
>
>
I'm making this program that tracks a number of different kind of
>
processes.
>
To keep track of and sync everything, I have one App-controller that
>
tracks and controls general stuff and 5 different "process
>
controllers" (one for every kind). And each "process controller"
>
tracks and controls one part of the user interface. Thus:
>
>
GUI
>
|
>
App controller <-> Process controller 1
>
|
>
DATA
>
>
The only problem is that I can't let App controller induce a method of
>
the process controller. I implemented the messaging identical to the
>
currency converter tutorial:
>
Example:
>
- AppController.m file import the ProcessControllers header file
>
>
- ProcessControllers' message I want to be invoked:
>
- (void) beepForMe{
>
NSBeep();
>
}
>
>
- AppControllers' request:
>
[ProcessController beepForMe];
>
>
Then I get the following build warning, and the invocation doesn't
>
take place:
>
>
warning: cannot find class (factory) method.
>
warning: return type for 'beepForMe' defaults to id
>
>
Why doesn't this work? Is it because I have to target an excisting
>
object that has already been instantiated (in contrast to currency
>
converter's converter object? In that case should I use a different
>
way to invoke the method? I know I can probaly use notifications, is
>
this the supposed way of implementing interobject method invocations?
>
Again, all remarks are surely welcome!
>
>
Alex
>
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