getUsage method
Implementation
int getUsage(Pointer<Int32> pfut) => (ptr.ref.vtable + 4)
.cast<
Pointer<
NativeFunction<Int32 Function(Pointer, Pointer<Int32> pfut)>>>()
.value
.asFunction<
int Function(Pointer, Pointer<Int32> pfut)>()(ptr.ref.lpVtbl, pfut);