Get Components

hi everyone,
I know how i can get components information from transparent tables or any structure in the data dictionary.
But, if i have just a internal table, how can i get components table?
E.g:
data:
types: BEGIN OF st_table,
        matnr type matnr,
        name1 type name1,
       END OF st_table.
data: i_table TYPE TABLE OF st_table.
DATA: l_struc TYPE REF TO cl_abap_structdescr.
DATA: lt_comp TYPE cl_abap_structdescr=>component_table.
DATA: ls_comp LIKE LINE OF lt_comp.
l_struc ?= cl_abap_typedescr=>describe_by_name( itab-tabname ).
lt_comp = l_struc->get_components( ).
Does not work out
i've already try the following ones:
DESCRIBE_BY_DATA
DESCRIBE_BY_NAME
DESCRIBE_BY_OBJECT_REF
DESCRIBE_BY_DATA_REF
Any idea?
Alexandre

Try this:
REPORT Z_MP_TEST_STRUCT.
data: idfies type table of dfies with header line,
      s_file TYPE string.
parameters: p_table type ddobjname.
parameters: filename(80) type c default 'D:\Documents and Settings\Desktop\download.xls'.
call function 'DDIF_FIELDINFO_GET'
exporting
tabname = p_table
tables
dfies_tab = idfies
exceptions
not_found = 1
internal_error = 2
others = 3.
s_file = filename.
CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      FILENAME                = s_file
      FILETYPE                = 'DAT'
    TABLES
      DATA_TAB                = idfies
    EXCEPTIONS
      FILE_WRITE_ERROR        = 1
      NO_BATCH                = 2
      GUI_REFUSE_FILETRANSFER = 3
      INVALID_TYPE            = 4
      NO_AUTHORITY            = 5
      UNKNOWN_ERROR           = 6
      HEADER_NOT_ALLOWED      = 7
      SEPARATOR_NOT_ALLOWED   = 8
      FILESIZE_NOT_ALLOWED    = 9
      HEADER_TOO_LONG         = 10
      DP_ERROR_CREATE         = 11
      DP_ERROR_SEND           = 12
      DP_ERROR_WRITE          = 13
      UNKNOWN_DP_ERROR        = 14
      ACCESS_DENIED           = 15
      DP_OUT_OF_MEMORY        = 16
      DISK_FULL               = 17
      DP_TIMEOUT              = 18
      FILE_NOT_FOUND          = 19
      DATAPROVIDER_EXCEPTION = 20
      CONTROL_FLUSH_ERROR     = 21
      OTHERS                  = 22.

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