>
> Subject: [edk2] Cannot access files with StdLib in my UEFI application
>
> From: "Cohen Nehemia, Eli" <[email protected]>
>
> To: "[email protected]" <[email protected]>
>
> Date: 2012-03-15 15:00:43
>
> Hi,
>
>
>
> I am developing an UEFI application using EADK and StdLib. That
> application runs just fine except when trying to access files.
>
>
>
> When I try to access a file with *fopen*, whether for reading an existing
> one or creating a new one, I get a NULL in return. Apparently, this is not
> a permission issue because *perror* says "file not found" for when trying
> to read an existing file. I tried to use both relative and absolute paths,
> used both slash and backslash separators, used *cwd* function to get the
> current working directory (which is "fs0:\") but nothing works. Using
> *access* function to check for file existence on the application
> executable file itself yields a "file not found" error code. BTW – *fopen*
> does not work on the Nt32 emulation either (did not check the *errno*
> there, though).
>
>
>
> Further details: Application compiled with most up to date EADK version,
> runs on an EFI Shell 2.31 [1.0] running mode 1.1.2, loaded from a USB stick
> mounted as fs0.
>
>
>
> Thanks!
> Eli.
Just to answer if someone stumbles across this. If you are using fopen() or
open() functions you need to make sure LibStdio and DevShell are added to
[LibraryClasses] in your .inf file.
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