这是为何？？关于周立功的开发板

为何？？请求和输入输出块定义如下；
   typedef struct _IO_BLOCK {
    IN      unsigned    uOffset;
    IN      unsigned    uLength;
    IN OUT  PUCHAR      pbyData;
    IN      unsigned    uIndex;
} IO_BLOCK, *PIO_BLOCK;

typedef struct _IO_REQUEST {
    unsigned short uAddressL;
    unsigned char bAddressH;
    unsigned short uSize;
    unsigned char bCommand;
} IO_REQUEST, *PIO_REQUEST;