[代码]如何在选择画面中显示图片

REPORT ztest_pic_sel_screen.
TYPE-POOLS cndp.
*&---------------------------------------------------------------------*
*& Data Declaration.
*&---------------------------------------------------------------------*
DATA: go_docking    TYPE REF TO cl_gui_docking_container,
      go_htmlviewer TYPE REF TO cl_gui_html_viewer,
      go_picture    TYPE REF TO cl_gui_picture.

DATA g_url  TYPE cndp_url.
*&---------------------------------------------------------------------*
*& SELECTION SCREEN.
*&---------------------------------------------------------------------*
PARAMETERS: s_matnr TYPE mara-matnr.

*&---------------------------------------------------------------------*
*& AT SELECTION-SCREEN OUTPUT.
*&---------------------------------------------------------------------*
AT SELECTION-SCREEN OUTPUT.

  CALL FUNCTION ‘DP_PUBLISH_WWW_URL‘
    EXPORTING
      objid    =   ‘ZPIC‘
      lifetime = cndp_lifetime_transaction
    IMPORTING
      url      = g_url
    EXCEPTIONS
      OTHERS   = 1.

* Load the go_picture.
  IF sy-subrc = 0.
    PERFORM frm_build_htmlviewer.
    CALL METHOD go_picture->set_display_mode
      EXPORTING
        display_mode = cl_gui_picture=>display_mode_normal.
    CALL METHOD go_picture->load_picture_from_url_async
      EXPORTING
        url = g_url.
  ENDIF.
*&---------------------------------------------------------------------*
*&      Form  build_htmlviewer
*&---------------------------------------------------------------------*
FORM frm_build_htmlviewer .

  DATA: repid LIKE sy-repid.
  repid = sy-repid.

  IF go_docking IS INITIAL.

    CREATE OBJECT go_docking
      EXPORTING
        repid                       = repid
        dynnr                       = sy-dynnr
        side                        = cl_gui_docking_container=>dock_at_top
        extension                   = 80
      EXCEPTIONS
        cntl_error                  = 1
        cntl_system_error           = 2
        create_error                = 3
        lifetime_error              = 4
        lifetime_dynpro_dynpro_link = 5
        OTHERS                      = 6.

    IF go_htmlviewer IS INITIAL .
      CREATE OBJECT go_picture
        EXPORTING
          parent = go_docking.
    ENDIF .
  ENDIF .
ENDFORM.