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C++中ReadFile的结构如下：
BOOL WINAPI ReadFile(
_In_ HANDLE hFile,
_Out_ LPVOID lpBuffer,
_In_ DWORD nNumberOfBytesToRead,
_Out_opt_ LPDWORD lpNumberOfBytesRead,
_Inout_opt_ LPOVERLAPPED lpOverlapped
);
前面几个参数就不用介绍了，MSDN中说：If lpOverlapped is not NULL, the read operation starts at the offset that is specified in the OVERLAPPED structure and ReadFile does not return until the read operation is complete。因此可以在最后一个参数中设置偏移量，从特定位置读取文件……
BOOL WINAPI ReadFile(
_In_ HANDLE hFile,
_Out_ LPVOID lpBuffer,
_In_ DWORD nNumberOfBytesToRead,
_Out_opt_ LPDWORD lpNumberOfBytesRead,
_Inout_opt_ LPOVERLAPPED lpOverlapped
);
前面几个参数就不用介绍了，MSDN中说：If lpOverlapped is not NULL, the read operation starts at the offset that is specified in the OVERLAPPED structure and ReadFile does not return until the read operation is complete。因此可以在最后一个参数中设置偏移量，从特定位置读取文件……
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