Function CTFontManagerRegisterFontsForURL 

pub unsafe extern "C-unwind" fn CTFontManagerRegisterFontsForURL(
    font_url: &CFURL,
    scope: CTFontManagerScope,
    error: *mut *mut CFError,
) -> bool

Available on crate feature CTFontManager only.

Registers fonts from the specified font URL with the font manager. Registered fonts participate in font descriptor matching.

Parameter fontURL: A file URL for the font or collection (TTC or OTC) to be registered. Once fonts have been registered from a file, it shouldn’t be moved or renamed.

Parameter scope: Scope constant defining the availability and lifetime of the registration. See scope constants for more details.

Parameter error: Pointer to receive CFError in the case of failed registration.

Returns: Returns true if registration of the fonts was successful.

Safety

error must be a valid pointer or null.