Bdc uploading data

Question

while i am working with bdc when i am uploading flat file into sap.every time i am going to give the path of that file.i just cal function module gui_upload and give the path,how can i give the path dynamically.what is the use F4_filename

Answer 1

SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME TITLE text-002.
PARAMETERS:p_efile LIKE rlgrap-filename OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b2.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR  p_file.
  CALL FUNCTION 'F4_FILENAME'
   EXPORTING
     program_name        = syst-cprog
     dynpro_number       = syst-dynnr
  FIELD_NAME          = 'P_File'
   IMPORTING
     file_name           = p_file.
this FM is used to get the file path of local system through dialog box.
Now the P_file will contain the file path
Use the following FM to upload the file
    CALL FUNCTION 'WS_UPLOAD'
     EXPORTING
  CODEPAGE                      = ' '
       filename                      = p_file
       filetype                      = 'DAT'
  HEADLEN                       = ' '
  LINE_EXIT                     = ' '
  TRUNCLEN                      = ' '
  USER_FORM                     = ' '
  USER_PROG                     = ' '
  DAT_D_FORMAT                  = ' '
IMPORTING
  FILELENGTH                    =
      TABLES
        data_tab                      = it_text[]
EXCEPTIONS
   conversion_error              = 1
   file_open_error               = 2
   file_read_error               = 3
   invalid_type                  = 4
   no_batch                      = 5
   unknown_error                 = 6
   invalid_table_width           = 7
   gui_refuse_filetransfer       = 8
   customer_error                = 9
   OTHERS                        = 10
    IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
         WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    ENDIF.
IF it_text[] IS INITIAL.
File is empty ! No data to Upload
   MESSAGE i130.
   LEAVE LIST-PROCESSING.
ENDIF.
Hope this helps.
Bikas