Error NULL object reference

former_member194669 — Wed, 07 Feb 2007 20:29:55 GMT

Hi All,

I am calling a method in at selection-screen on help-request event. But it is giving me dump ie "Access not possible using 'NULL' object reference"



  data : disp_help type ref to l_display_help.
  create object disp_help.
  at selection-screen on help-request for p_awerk.
    call method disp_help->m_display_help( ).


*&---------------------------------------------------------------------*
* Class l_display_help Implementation                                  *
*&---------------------------------------------------------------------*
* To display the documentation for the button clicked                  *
*----------------------------------------------------------------------*
class l_display_help implementation.
  method m_display_help.
    clear wa_help.
    refresh i_help.

    wa_help-tdline = text-069.
    wa_help-tdformat = '1'.
    append wa_help to i_help.
    clear wa_help.

    wa_help-tdline = text-070.
    wa_help-tdformat = '2'.
    append wa_help to i_help.
    clear wa_help.

    wa_help-tdline = text-071.
    wa_help-tdformat = '3'.
    append wa_help to i_help.
    clear wa_help.
    v_title = text-072.
    call function 'COPO_POPUP_TO_DISPLAY_TEXTLIST'
      exporting
        task       = c_display
        titel      = v_title
      tables
        text_table = i_help.
  endmethod.                             " M_display_help
endclass.                                " L_display_help IMPLEMENTATION

class l_display_help definition.
  public section.
    data : v_title type n.
    data : t_help  type tline.
    data : i_help  type standard table of t_help.
    data : wa_help type t_help.
    methods : m_display_help.
endclass.                                " L_display_help

Thanks

aRs

Re: Error NULL object reference

RichHeilman — Wed, 07 Feb 2007 20:34:36 GMT

You must first create the object, but since it is not put in an event, it is not triggering the CREATE OBJECT. Modify like so.



  data : disp_help type ref to l_display_help.
  intialization.
       create object disp_help.
  at selection-screen on help-request for p_awerk.
       call method disp_help->m_display_help( ).

or.........



  data : disp_help type ref to l_display_help.

  at selection-screen on help-request for p_awerk.
    if   disp_help is initial
          create object disp_help.
    endif..
    call method disp_help->m_display_help( ).

Regards,

RIch Heilman

Re: Error NULL object reference

former_member194669 — Wed, 07 Feb 2007 20:37:56 GMT

Thanks Rich,

Your reply is working.

Thanks

aRs

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