UDK2017 fopen使用问题

本人在调试fopen时候发现如下问题：

20180316 updata

StdLib\ReadMe.txt

INF Files
=========
The INF files for most modules will not require special directives in order to
support the Standard Libraries.  The two sections which require attention: LibraryClasses
and BuildOptions, are described below.


  [LibraryClasses]
    UefiLib
    LibC
    LibString
    LibStdio
    DevShell


                      Figure 6: Module Library Classes
                      ================================




Modules of type UEFI_APPLICATION that perform file I/O must include library
class DevShell.  Including this library class will allow file operations to be
handled by the UEFI Shell.  Without this class, only Console I/O is supported.




An application's INF file might need to include a [BuildOptions] section
specifying additional compiler and linker flags necessary to allow the
application to be built. Usually, this section is not needed.  When building
code from external sources, though, it may be necessary to disable some
warnings or enable/disable some compiler features.


 [BuildOptions]
  INTEL:*_*_*_CC_FLAGS          = /Qdiag-disable:181,186
   MSFT:*_*_*_CC_FLAGS          = /Oi- /wd4018 /wd4131
    GCC:*_*_IPF_SYMRENAME_FLAGS = --redefine-syms=Rename.txt