record case Size

Question

  _SYSTEM_INFO = record
    case Integer of
      0: (
        dwOemId: DWORD);
      1: (
        wProcessorArchitecture: Word;
        wReserved: Word;
        dwPageSize: DWORD;
        lpMinimumApplicationAddress: Pointer;
        lpMaximumApplicationAddress: Pointer;
        dwActiveProcessorMask: DWORD;
        dwNumberOfProcessors: DWORD;
        dwProcessorType: DWORD;
        dwAllocationGranularity: DWORD;
        wProcessorLevel: Word;
        wProcessorRevision: Word);
  end;这头大吧
不是0和1后面大小要一样吗?
Sizeof是36 为什么呢?
再有就 是 
  _SYSTEM_INFO = record
    case Integer of
      0: (
        dwOemId: DWORD);
      1: (
        wProcessorArchitecture: Word;
        wProcessorRevision: Word);
    newdata:integer;
  end;
这样就不行

Answer 1

_SYSTEM_INFO = record
    newdata:integer;
    case Integer of
      0: (
        dwOemId: DWORD);
      1: (
        wProcessorArchitecture: Word;
        wProcessorRevision: Word);
end;