getVolume method
Implementation
int getVolume(Pointer<Uint16> pusVolume) => (ptr.ref.vtable + 31)
.cast<
Pointer<
NativeFunction<
Int32 Function(Pointer, Pointer<Uint16> pusVolume)>>>()
.value
.asFunction<int Function(Pointer, Pointer<Uint16> pusVolume)>()(
ptr.ref.lpVtbl, pusVolume);