Type Alias LPFNVIEWCALLBACK 

pub type LPFNVIEWCALLBACK = Option<unsafe extern "system" fn(psvouter: *mut c_void, psf: *mut c_void, hwndmain: HWND, umsg: u32, wparam: WPARAM, lparam: LPARAM) -> HRESULT>;

Aliased Type

pub enum LPFNVIEWCALLBACK {
    None,
    Some(unsafe extern "system" fn(*mut c_void, *mut c_void, *mut c_void, u32, usize, isize) -> i32),
}

Variants

None

No value.

Some(unsafe extern "system" fn(*mut c_void, *mut c_void, *mut c_void, u32, usize, isize) -> i32)

Some value of type T.