How can we put F4 help for a given filepath

Question

hi all,
my requirement is  if i select one check box and give the file path  using GUI_DOWNLOAD  F.M.  file should be download to specific file. to achieve this i declared like this.
parameters: p_chk1 as checkbox,
                   p_file like rlgrap-filename.
can anybody help me how to write logic for this using F4_help F.M..
in output screen checkbox  and filepath is dispalying but when i check that checkbox and i hv to give filepath in that file parameter using f4 help.
reply me ASAP.
thanks in advance
swathi.

Answer 1

Hi , swathi.
I read your question, and this is my answer.
REPORT  ztest
        MESSAGE-ID Zxxxxx.
*SELECTION-SCREEN DEFINITION
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME.
  SELECTION-SCREEN BEGIN OF LINE.
    PARAMETERS: P_CHK1 AS CHECKBOX DEFAULT 'X',
                P_FILE LIKE RLGRAP-FILENAME.
  SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN END OF BLOCK B1.
AT SELECTION-SCREEN.
  IF P_CHK1 = 'X' AND P_FILE IS INITIAL.
   MESSAGE Exxx WITH 'xxxx'.
  ENDIF.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE.
  CALL FUNCTION 'KD_GET_FILENAME_ON_F4'
       EXPORTING
            mask      = ',.,.'
            static    = 'X'
       CHANGING
            file_name = P_FILE.
  IF SY-SUBRC <> 0.
  HANDLE ERROR
  ENDIF.
Regards,
feng.