[3/5] netprofm: Add a class factory implementation.

[Dmitry Timoshkov]

Hi Hans,

Hans Leidekker <hans at codeweavers.com> wrote:

> +struct netprofm_cf
> +{
> +    const struct IClassFactoryVtbl *vtbl;
> +    HRESULT (*create_instance)(void **);
> +};
> +
> +static inline struct netprofm_cf *impl_from_IClassFactory( IClassFactory *iface )
> +{
> +    return (struct netprofm_cf *)((char *)iface - FIELD_OFFSET( struct netprofm_cf, vtbl ));
> +}

Objects in this new dll don't follow http://wiki.winehq.org/COMGuideline,
but that's not a big problem, and could be fixed later.

> +static HRESULT WINAPI netprofm_cf_CreateInstance( IClassFactory *iface, LPUNKNOWN outer,
> +                                                  REFIID riid, LPVOID *obj )
> +{
> +    struct netprofm_cf *factory = impl_from_IClassFactory( iface );
> +    IUnknown *unk;
> +    HRESULT r;
> +
> +    TRACE( "%p %s %p\n", outer, debugstr_guid(riid), obj );
> +
> +    *obj = NULL;
> +    if (outer) return CLASS_E_NOAGGREGATION;
> +
> +    r = factory->create_instance( (void **)&unk );
> +    if (FAILED( r ))
> +        return r;
> +
> +    r = IUnknown_QueryInterface( unk, riid, obj );
> +    if (FAILED( r ))
> +        return r;
> +
> +    IUnknown_Release( unk );
> +    return r;
> +}

It seems that 'unk' is leaked if IUnknown_QueryInterface fails.

-- 
Dmitry.