getGroupingParam method
Implementation
int getGroupingParam(Pointer<GUID> pRetVal) => (ptr.ref.vtable + 8)
.cast<
Pointer<
NativeFunction<Int32 Function(Pointer, Pointer<GUID> pRetVal)>>>()
.value
.asFunction<
int Function(
Pointer, Pointer<GUID> pRetVal)>()(ptr.ref.lpVtbl, pRetVal);