F4 for filename does not behave good in CALL SELECTION_SCREEN?

Question

I have a F4_File name called on value -request for p_file which was decalred as part of the CALL SELECTION-SCREEN 500
It does bring up the file dialog but gets out of the loop as soon as the EXECUTE button is clicked?
How to over come this?

Answer 1

That is the standard behvaiour. The value will be in changing parameter (file_table              = t_filetable). you need to read the value.
Check out this example.
at selection-screen on value-request for pu_path.
  clear: t_rc.
  refresh: t_filetable.
  call method cl_gui_frontend_services=>file_open_dialog
    exporting
      window_title            = 'Gui upload demo'
      with_encoding           = 'X'
      initial_directory       = 'C:\test\'
     FILE_FILTER             = '*.XLS'
     DEFAULT_EXTENSION       = 'Excel files [*.XLS]'
    changing
      file_table              = t_filetable
      rc                      = t_rc
      user_action             = user_action
      file_encoding           = encoding
    exceptions
      file_open_dialog_failed = 1
      cntl_error              = 2
      error_no_gui            = 3
      not_supported_by_gui    = 4
      others                  = 5.
  if sy-subrc <> 0.
    message id sy-msgid type sy-msgty number sy-msgno
               with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
  elseif user_action eq 0.
    read table t_filetable into wa_filetable index 1.
    t_path = wa_filetable-filename.
    call method cl_gui_frontend_services=>file_exist
      exporting
        file                 = t_path
      receiving
        result               = abap_bool
      exceptions
        cntl_error           = 1
        error_no_gui         = 2
        wrong_parameter      = 3
        not_supported_by_gui = 4
        others               = 5.
    if sy-subrc <> 0.
      message id sy-msgid type sy-msgty number sy-msgno
                 with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    elseif abap_bool eq 'X'.
      pu_path = t_path.
    else.
  Message File does not exist.
    endif.
  endif.
If you have questions, look at method documentation.