The f_opendir function opens a directory.
FRESULT f_opendir ( DIR* DirObject, /* Pointer to the blank directory object structure */ const char* DirName /* Pointer to the directory name */ );
The f_opendir function opens an exsisting directory and creates the directory object for subsequent calls. The directory object structure can be discarded at any time without any procedure. This function is not supported in minimization level of >=2.