Outlet between 2 controller object

[Alain Birtz]

In Interface Builder the IBOulet "from_A_to_B" was added to Controller_A
and a connection made from Controller_A to Controller_B

Controller_A.m hold the code

int v;

v = [from_A_to_B test_int];

Controller_A.h hold the declaration (in @interface Controller_A : NSObject)

IBOutlet id from_A_to_B;

Controller_B.m hold the code

- (int)test_int
{
return 12345;
}

Controller_B.h hold the declaration

- (int)test_int;

The compiler report this error

Error : unknown message selector
Controller_A.m line 13 v = [from_A_to_B test_int];

Do I have made an illegal IB connection ?
What code is missing/wrong ?

Thank you.

[matt neuburg]

In <abz-1609031544460001@192.168.1.3> Alain Birtz wrote:

> The compiler report this error
>
> Error : unknown message selector
> Controller_A.m line 13 v = [from_A_to_B test_int];
>
> Do I have made an illegal IB connection ?
> What code is missing/wrong ?

You need to learn Objective-C. The form of an Objective-C method call is:

[classOrInstance methodName];

You have just [methodName] alone, which is meaningless. m.

--
matt neuburg, phd = [email]matt@tidbits.com[/email], [url]http://www.tidbits.com/matt[/url]
REALbasic: The Definitive Guide! 2nd edition!
[url]http://www.amazon.com/exec/obidos/ASIN/0596001770/somethingsbymatt[/url]
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[Alain Birtz]

But from_A_to_B is just a "classOrInstance"
By example to get a pointer to an NSWindow from an IBOutlet
named main_wind the [main_wind window] is uded.
from_A_to_B is an IBOutlet to the Controller_B object
In fact the problem is only a missing declaration.
Adding the 3 line below in Controller_A.h solve the problem

@interface Controller_B : NSObject
- (int)test_int;
@end

In Controller_A.m the v value is correctly set to 12345 by the instruction

v = [from_A_to_B test_int];

But there is one thing I am not sure: is it correct to connect two controller
object (with an IBOutlet) in this way...

Thank you.

In article <20030916155043535-0700@news.la.sbcglobal.net>, matt neuburg
<matt@tidbits.com> wrote:

> In <abz-1609031544460001@192.168.1.3> Alain Birtz wrote:

> > The compiler report this error
> >
> > Error : unknown message selector
> > Controller_A.m line 13 v = [from_A_to_B test_int];
> >
> > Do I have made an illegal IB connection ?
> > What code is missing/wrong ?

>
> You need to learn Objective-C. The form of an Objective-C method call is:
>
> [classOrInstance methodName];
>
> You have just [methodName] alone, which is meaningless. m.

[matt neuburg]

Alain Birtz <abz@videotron.ca> wrote:

> But from_A_to_B is just a "classOrInstance"

Right - sorry! m.


--
matt neuburg, phd = [email]matt@tidbits.com[/email], [url]http://www.tidbits.com/matt/[/url]
Read TidBITS! It's free and smart. [url]http://www.tidbits.com[/url]

[Michael Milvich]

[email]abz@videotron.ca[/email] (Alain Birtz) wrote in message news:<abz-1609031544460001@192.168.1.3>...

> The compiler report this error
>
> Error : unknown message selector
> Controller_A.m line 13 v = [from_A_to_B test_int];
>
> Do I have made an illegal IB connection ?
> What code is missing/wrong ?
>
> Thank you.

Are you sure this was an error? or was it just a warning? Or is your
compiler set to treat all warnings as errors?

I think you just need to import Controller_B.h from Controller_A.m.
Usually this makes a warning instead of an error...

Michael

[Eric Pepke]

[email]abz@videotron.ca[/email] (Alain Birtz) wrote in message news:<abz-1609031544460001@192.168.1.3>...

> Do I have made an illegal IB connection ?
> What code is missing/wrong ?

Simple problem.

> IBOutlet id from_A_to_B;

The "id" means "it's an object of unspecified type." The compiler
does not know to look in Controller_B.h.

You can fix it by changing it to

IBOutled (Controller_B *) from_A_to_B;

In the future, you can make this kind of thing not happen by,
when creating an outlet, giving it a type using the pull-down
menu. I'm guessing you probably didn't do that, not knowing
what it was for. Well, this is what it's for.

[Alain Birtz]

In CW 8.0 this is a (Compiler or Linker) error not a warning...

In article <21ff4ea2.0309171018.2ec08b10@posting.google.com >,
[email]michael@milvich.com[/email] (Michael Milvich) wrote:

> [email]abz@videotron.ca[/email] (Alain Birtz) wrote in message

news:<abz-1609031544460001@192.168.1.3>...

> > The compiler report this error
> >
> > Error : unknown message selector
> > Controller_A.m line 13 v = [from_A_to_B test_int];
> >
> > Do I have made an illegal IB connection ?
> > What code is missing/wrong ?
> >
> > Thank you.

>
> Are you sure this was an error? or was it just a warning? Or is your
> compiler set to treat all warnings as errors?
>
> I think you just need to import Controller_B.h from Controller_A.m.
> Usually this makes a warning instead of an error...
>
> Michael