Type Alias windows::Win32::Media::Audio::LPMIDICALLBACK

pub type LPMIDICALLBACK = Option<unsafe extern "system" fn(hdrvr: HDRVR, umsg: u32, dwuser: usize, dw1: usize, dw2: usize)>;

Aliased Type

enum LPMIDICALLBACK {
    None,
    Some(unsafe extern "system" fn(_: HDRVR, _: u32, _: usize, _: usize, _: usize)),
}

Variants

None

No value.

Some(unsafe extern "system" fn(_: HDRVR, _: u32, _: usize, _: usize, _: usize))

Some value of type T.