shell32: Make SHGetDesktopFolder use a cached instance of IShellFolder

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at codeweavers.com> writes:

> +        sf = LocalAlloc( LMEM_ZEROINIT, sizeof (IGenericSFImpl) );
> +        if (!sf)
> +            return E_OUTOFMEMORY;
> +
> +        if (InterlockedCompareExchangePointer((void *)&cached_sf, sf, NULL) != NULL)
> +            LocalFree( sf ); /* some other thread already been here */
> +        else
> +        {
> +            sf->ref = 0;
> +            sf->lpVtbl = &vt_MCFldr_ShellFolder2;
> +            sf->pidlRoot = _ILCreateDesktop();    /* my qualified pidl */
> +            sf->sPathTarget = SHAlloc( (lstrlenW(szMyPath) + 1)*sizeof(WCHAR) );
> +            lstrcpyW( sf->sPathTarget, szMyPath );
> +        }
> +    }

You need to initialize the object completely before storing it as
cached entry.

-- 
Alexandre Julliard
julliard at winehq.org