dwFileOffsetHigh
[in] Specifies the high-order DWORD of the file offset where mapping is to begin.
dwFileOffsetLow
[in] Specifies the low-order DWORD of the file offset where mapping is to begin. The combination of the high and low offsets must specify an offset within the file that matches the system's memory allocation granularity, or the function fails. That is, the offset must be a multiple of the allocation granularity. Use the GetSystemInfo function, which fills in the members of a SYSTEM_INFO structure, to obtain the system's memory allocation granularity.
dwNumberOfBytesToMap
[in] Specifies the number of bytes of the file to map. If dwNumberOfBytesToMap is zero, the entire file is mapped.

偏移为0； 字节数为0表示全部映射，有问题吗？