objc2_core_foundation

Function CFStringGetBytes

Source 
pub unsafe extern "C-unwind" fn CFStringGetBytes(
    the_string: &CFString,
    range: CFRange,
    encoding: CFStringEncoding,
    loss_byte: u8,
    is_external_representation: bool,
    buffer: *mut u8,
    max_buf_len: CFIndex,
    used_buf_len: *mut CFIndex,
) -> CFIndex
Available on crate features CFBase and CFString only.