addMinutes method
Implementation
void addMinutes(int minutes) {
final hr = ptr.ref.vtable
.elementAt(80)
.cast<
Pointer<NativeFunction<HRESULT Function(Pointer, Int32 minutes)>>>()
.value
.asFunction<
int Function(Pointer, int minutes)>()(ptr.ref.lpVtbl, minutes);
if (FAILED(hr)) throw WindowsException(hr);
}