.abap

DATA: filetable      TYPE STANDARD TABLE OF char255,
      COUNT          TYPE I.

  CALL METHOD cl_gui_frontend_services=>directory_list_files
    EXPORTING
      directory                   = file_path
      FILTER                      = '*.*'
      files_only                  = 'X'
    CHANGING
      file_table                  = filetable
      COUNT                       = COUNT
    EXCEPTIONS
      cntl_error                  = 1
      directory_list_files_failed = 2
      wrong_parameter             = 3
      error_no_gui                = 4
      not_supported_by_gui        = 5
      OTHERS                      = 6.