[ABAP] Google-API: QR-Code generieren und Bild herunterladen/speichern

* Dateiname der Bilddatei zum hochladen
PARAMETERS: p_fname TYPE file_table-filename OBLIGATORY.

START-OF-SELECTION.
* URL zur Google-API für die Erstellung des QR-Codes
  DATA(lv_url) = |http://chart.apis.google.com/chart?chs=200x200&cht=qr&chld=\|1&chl=viele%20lustige%20Zeichen/chart.png|.

  TRY.
      DATA: o_client TYPE REF TO if_http_client.
* Client-Objekt erzeugen
      cl_http_client=>create_by_url( EXPORTING
                                       url     = lv_url
                                     IMPORTING
                                       client  = o_client ).
      IF sy-subrc = 0.
* HTTP GET senden
        o_client->send( ).

* Response lesen
        o_client->receive( ).

        DATA: lv_http_status TYPE i.
        DATA: lv_status_text TYPE string.

* HTTP Return Code holen
        o_client->response->get_status( IMPORTING
                                          code   = lv_http_status
                                          reason = lv_status_text ).

* Wenn Status 200 (Ok)
        IF lv_http_status = 200.

* Binärdaten (QR-Code) auslesen
          DATA(lv_xdata) = o_client->response->get_data( ).

          o_client->close( ).

* xstring -> solix
          DATA(it_img_conv_data) = cl_bcs_convert=>xstring_to_solix( iv_xstring = lv_xdata ).

          WRITE: / |{ p_fname }.png|.

* Image lokal speichern
          cl_gui_frontend_services=>gui_download( EXPORTING
                                                    filename     = |{ p_fname }.png|
                                                    filetype     = 'BIN'
                                                    bin_filesize = xstrlen( lv_xdata )
                                                  CHANGING
                                                    data_tab     = it_img_conv_data ).

        ENDIF.
      ENDIF.
    CATCH cx_root INTO DATA(e_txt).
      WRITE: / e_txt->get_text( ).
  ENDTRY.

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