Function safe_app::ffi::mutable_data::entries::mdata_keys_len [−] [src]

#[no_mangle]
pub unsafe extern "C" fn mdata_keys_len(
    app: *const App, 
    keys_h: MDataKeysHandle, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(_: *mut c_void, _: FfiResult, _: usize)
)

Returns the number of keys.

Callback parameters: user data, error code, length