On 14-Sep-07, at 7:12 AM, Alfred Van Hoek wrote:
>
> On Sep 13, 2007, at 9:31 PM, Norman Palardy wrote:
>
>> 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 ;
>>
>> }
>
>
> Not sure what you do here. I guess you would want to use
> "RBClassThatImplementsTheInterface" as a registration of a
> PluginClass that implements the interface.
>
> When you call
>
> Boolean SomeFunc(data *instance)
> {
> Boolean (*func)(void);
> func = ( Boolean(*)(void) )
> REALInterfaceRoutine (instance->iFuncsProvider,
> "iFunctions", "SomeFunc() as Boolean");
> if (! func)
> return false;
>
> return func();
> }
>
> the instance variable to call the interface on, should be on the
> PluginClass instance and not on the "iFuncsProvider", because the
> user, the caller, of PluginClass had indicated that PluginClass
> promised to implement the methods defined in the interface (I suppose
> that as a given).
The plugin class takes another class as a set of callbacks
The user has to create a class that implements the interface the
plugin defines (call this the callbacks)
The "callbacks" have to conform to an interface the plugin also defines
Then when they create a new instance of the class the plugin defines
they have to pass their callbacks as part of the constructor
dim pc as PluginClass // the plugin class that requires the call backs
dim pi as myCallbacks // <<<<< the users callbacks
pi = new myCallbacks
pc = new PluginClass(pi)
in the plugin I have this code to hang on to the object reference to
the users callbacks
void ConstructorWithParams ( REALobject instance, REALobject
iFuncsProvider )
{
ClassData (Class, instance, data, local);
REALLockObject(iFuncsProvider) ;
local->iFuncsProvider = iFuncsProvider ;
}
so it seems like my class should be hanging on to the reference to
the users callback instance so it won't disappear when it goes out of
scope
But when I go to call one their functions I can't seem to get a valid
function pointer to their implementations of the methods
So far no luck
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