PCOPYFILE2_PROGRESS_ROUTINE typedef
        PCOPYFILE2_PROGRESS_ROUTINE =
     Int32 Function(Pointer<COPYFILE2_MESSAGE> , Pointer<Void> )
    
    
    
Implementation
typedef PCOPYFILE2_PROGRESS_ROUTINE = ffi.Int32 Function(
  ffi.Pointer<COPYFILE2_MESSAGE>,
  ffi.Pointer<ffi.Void>,
);