calling methods of a class in RB

[Norman Palardy <npalardy at great-white-software dot com>]

Using the OLD plugin SDK at the moment

I've defined a class and an interface in a plugin

In my RB code I have a class that implements the interface

When I make a new instance of the plugins class, I need to construct  
it with an instance that implements the interface

Basically
        dim pc as PluginClass
        dim pi as RBClassThatImplementsTheInterface

        pi = new RBClassThatImplementsTheInterface

        pc = new PluginClass(pi)

in my plugin I have code that hangs on to the instance and locks it like

        void ConstructorWithParams ( REALobject instance, REALobject  
iFuncsProvider )
        
        {
                
                ClassData (Class, instance, data, local);
        
                REALLockObject(iFuncsProvider) ;
        
                local->iFuncsProvider = iFuncsProvider ;
        
        }

When trying to call one of the methods in the RB instance I'm doing

        Boolean  SomeFunc(data *instance)
        {
                Boolean (*func)(void);
                func = ( Boolean(*)(void) ) REALLoadObjectMethod(instance- 
 >iFuncsProvider, "SomeFunc() as Boolean");
                if (not func)
                        return false;
        
                return func();
        }

But I always get a failed assertion, failure condition classDef with  
no message

I think I have everything set up right.
If I change SomeFunc to

        Boolean  SomeFunc(data *instance)
        {
                if (instance->iFuncsProvider == NULL)
                        return false;
                else
                        return true ;   
        }

this returns true so I seem to have the object reference saved OK.  
It's at least non-null

Thoughts ?
I'd be happy to send my project to someone off list to go over it in  
more detail


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Subject: Re: calling methods of a class in RB
From: support at monkeybreadsoftware dot de (Christian Schmitz)
Date: Fri, 14 Sep 2007 03:57:54 +0200
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Norman Palardy <npalardy at great-white-software dot com> wrote:

>               func =3D ( Boolean(*)(void) ) REALLoadObjectMethod(instance-

Don't load using REALLoadObjectMethod. It was defined much later than
interfaces.

Use REALInterfaceRoutine:

REALInterfaceRoutine
68k PPC OSX Win X11 =

RB 2.1

This function is for supporting binds. It returns the method on the
given object which implements the given method name, of the class
interface defined by interfaceName.

Parameters:
obj
REALobject
object which implements a binding method
interfaceName
const char *
binding interface to look for
methodName
const char *
specific method to look for
Returns:
REALproc
method implementation, or nil if not found


Gru=DF
Christian

-- =

Over 800 classes with 16000 functions in one REALbasic plug-in. =

The Monkeybread Software Realbasic Plugin v7.5. =


<http://www.monkeybreadsoftware.de/realbasic/plugins.shtml>
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