[gmpi] Re: low level API - Abstract Factory summary
- From: jeffmcc@xxxxxxxxxx
- To: gmpi@xxxxxxxxxxxxx
- Date: Wed, 09 Feb 2005 12:33:33 +1300
> HRESULT CreateFactory( CLSID clsidClass, IFactory**
ppFactory );
Hi Ron,
So each plugin has a unique ID code, we pass that to the
factory, it returns a GMPI_Plugin interface. That's good...
But we first need the list of available IDs (in that dll).
So don't we need a second function too, that given an index,
returns the metadata for a plugin in the dll?
HRESULT GetGMPI_PluginDescriptor( int index,
IGMPI_PluginDescriptor **pd );
The metadata interface supplys the plugin's unique ID, it's
name etc.
Am I on the right track?
Jeff
PS: mayby replace HRESULT with GMPI_RESULT.
>
> >>>
> I think making it an object is just OO masturbation. It
> feels good, but it doesn't really achieve anything.
> <<<
>
> The reason it seems overengineered is because the factor
> interface hasn't been defined properly. I reall should be
> something like this:
>
> struct IFactory
> {
> HRESULT CreateInstance( IUnknown** ppObj ) = 0;
> };
>
> HRESULT CreateFactory( CLSID clsidClass, IFactory**
> ppFactory );
>
> The idea is: a single module can be a factory for a
> variety of different classes. You instantiate new objects
> of a class through the factory for the class, and you get
> the identify the factory by CLSID (GUID).
>
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