<?php // Sample using sizeof
    Function _Win_Ffi_GlobalMemoryStatus()
    {
      static $Kernel32, $a, $r;
      $Kernel32??=FFI::cdef(<<<'IDL'
        typedef struct _MemoryStatus {
          uint32_t Length        ;
          uint32_t MemoryLoad    ;
          uint64_t TotalPhys     ;
          uint64_t AvailPhys     ;
          uint64_t TotalPageFile ;
          uint64_t AvailPageFile ;
          uint64_t TotalVirtual  ;
          uint64_t AvailVirtual  ;
        } MemoryStatus;
        void GlobalMemoryStatus(MemoryStatus* buf);
       IDL, 'Kernel32.dll');
      $a??=$Kernel32->new('MemoryStatus');
      $a->Length =$Kernel32::sizeof($Kernel32->type('MemoryStatus'));
      $r??=FFI::addr($a);
      $Kernel32->GlobalMemoryStatus($r);
      return [
        'Total' =>$a->TotalPhys,
        'Free'  =>$a->TotalPhys-$a->AvailPhys,
        'Load'  =>$a->MemoryLoad*0.01,
      ];
    }
?>