Finds the next file or directory within a FAT file system directory. Call f_findfirst()
to find the first file or directory, then f_findnext() to find subsequent files and directories -
the same instance of the F_FIND object must be used with both the findfirst and findnext
A structure in which the 'find' information is stored.
The structure must be completed by a successful call to
f_findfirst() before it can be passed to f_findnext().
The call to f_findnext() was successful and pxFindStruct
Any other value
The call to f_findnext() was not successful. The return
value holds the error code.