Fm or class existing for fetching xml contents from a file using abap ?

Question

Hi,
I need to fetch an xml file in a string of type xstring. I am using class cl_gui_frontend_services=>gui_upload.
This returns me content in table format, than i am planning to conver to xstring.
Is there any better approach or any existing function module any one know of ?
thanks
Regards
Pooja

Answer 1

Hi Pooja,
You can try out this program to read the XML file using abap.
*& Report  ZXMLTOITAB                                                 *
REPORT  ZXMLTOITAB                            .
  TYPE-POOLS: ixml.
  TYPES: BEGIN OF t_xml_line,
          data(256) TYPE x,
        END OF t_xml_line.
  DATA: l_ixml            TYPE REF TO if_ixml,
        l_streamfactory   TYPE REF TO if_ixml_stream_factory,
        l_parser          TYPE REF TO if_ixml_parser,
        l_istream         TYPE REF TO if_ixml_istream,
        l_document        TYPE REF TO if_ixml_document,
        l_node            TYPE REF TO if_ixml_node,
        l_xmldata         TYPE string.
  DATA: l_elem            TYPE REF TO if_ixml_element,
        l_root_node       TYPE REF TO if_ixml_node,
        l_next_node       TYPE REF TO if_ixml_node,
        l_name            TYPE string,
        l_iterator        TYPE REF TO if_ixml_node_iterator.
  DATA: l_xml_table       TYPE TABLE OF t_xml_line,
        l_xml_line        TYPE t_xml_line,
        l_xml_table_size  TYPE i.
  DATA: l_filename        TYPE string.
  PARAMETERS: pa_file TYPE char1024 DEFAULT 'c:\temp\orders_dtd.xml'.
* Validation of XML file: Only DTD included in xml document is supported
  PARAMETERS: pa_val  TYPE char1 AS CHECKBOX.
  START-OF-SELECTION.
*   Creating the main iXML factory
    l_ixml = cl_ixml=>create( ).
*   Creating a stream factory
    l_streamfactory = l_ixml->create_stream_factory( ).
    PERFORM get_xml_table CHANGING l_xml_table_size l_xml_table.
*   wrap the table containing the file into a stream
    l_istream = l_streamfactory->create_istream_itable( table =
l_xml_table
                                                    size  =
l_xml_table_size ).
*   Creating a document
    l_document = l_ixml->create_document( ).
*   Create a Parser
    l_parser = l_ixml->create_parser( stream_factory = l_streamfactory
                                      istream        = l_istream
                                      document       = l_document ).
*   Validate a document
    IF pa_val EQ 'X'.
      l_parser->set_validating( mode = if_ixml_parser=>co_validate ).
    ENDIF.
*   Parse the stream
    IF l_parser->parse( ) NE 0.
      IF l_parser->num_errors( ) NE 0.
        DATA: parseerror TYPE REF TO if_ixml_parse_error,
              str        TYPE string,
              i          TYPE i,
              count      TYPE i,
              index      TYPE i.
        count = l_parser->num_errors( ).
        WRITE: count, ' parse errors have occured:'.
        index = 0.
        WHILE index < count.
          parseerror = l_parser->get_error( index = index ).
          i = parseerror->get_line( ).
          WRITE: 'line: ', i.
          i = parseerror->get_column( ).
          WRITE: 'column: ', i.
          str = parseerror->get_reason( ).
          WRITE: str.
          index = index + 1.
        ENDWHILE.
      ENDIF.
    ENDIF.
*   Process the document
    IF l_parser->is_dom_generating( ) EQ 'X'.
      PERFORM process_dom USING l_document.
    ENDIF.
*&      Form  get_xml_table
  FORM get_xml_table CHANGING l_xml_table_size TYPE i
                              l_xml_table      TYPE STANDARD TABLE.
*   Local variable declaration
    DATA: l_len      TYPE i,
          l_len2     TYPE i,
          l_tab      TYPE tsfixml,
          l_content  TYPE string,
          l_str1     TYPE string,
          c_conv     TYPE REF TO cl_abap_conv_in_ce,
          l_itab     TYPE TABLE OF string.
    l_filename = pa_file.
*   upload a file from the client's workstation
    CALL METHOD cl_gui_frontend_services=>gui_upload
      EXPORTING
        filename   = l_filename
        filetype   = 'BIN'
      IMPORTING
        filelength = l_xml_table_size
      CHANGING
        data_tab   = l_xml_table
      EXCEPTIONS
        OTHERS     = 19.
    IF sy-subrc <> 0.
      MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
                 WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    ENDIF.
*   Writing the XML document to the screen
    CLEAR l_str1.
    LOOP AT l_xml_table INTO l_xml_line.
      c_conv = cl_abap_conv_in_ce=>create( input = l_xml_line-data
replacement = space  ).
      c_conv->read( IMPORTING data = l_content len = l_len ).
      CONCATENATE l_str1 l_content INTO l_str1.
    ENDLOOP.
    l_str1 = l_str1+0(l_xml_table_size).
    SPLIT l_str1 AT cl_abap_char_utilities=>cr_lf INTO TABLE l_itab.
    WRITE: /.
    WRITE: /' XML File'.
    WRITE: /.
    LOOP AT l_itab INTO l_str1.
      REPLACE ALL OCCURRENCES OF cl_abap_char_utilities=>horizontal_tab
IN
        l_str1 WITH space.
      WRITE: / l_str1.
    ENDLOOP.
    WRITE: /.
  ENDFORM.                    "get_xml_table
*&      Form  process_dom
  FORM process_dom USING document TYPE REF TO if_ixml_document.
    DATA: node      TYPE REF TO if_ixml_node,
          iterator  TYPE REF TO if_ixml_node_iterator,
          nodemap   TYPE REF TO if_ixml_named_node_map,
          attr      TYPE REF TO if_ixml_node,
          name      TYPE string,
          prefix    TYPE string,
          value     TYPE string,
          indent    TYPE i,
          count     TYPE i,
          index     TYPE i.
    node ?= document.
    CHECK NOT node IS INITIAL.
    ULINE.
    WRITE: /.
    WRITE: /' DOM-TREE'.
    WRITE: /.
    IF node IS INITIAL. EXIT. ENDIF.
*   create a node iterator
    iterator  = node->create_iterator( ).
*   get current node
    node = iterator->get_next( ).
*   loop over all nodes
    WHILE NOT node IS INITIAL.
      indent = node->get_height( ) * 2.
      indent = indent + 20.
      CASE node->get_type( ).
        WHEN if_ixml_node=>co_node_element.
*         element node
          name    = node->get_name( ).
          nodemap = node->get_attributes( ).
          WRITE: / 'ELEMENT  :'.
          WRITE: AT indent name COLOR COL_POSITIVE INVERSE.
          IF NOT nodemap IS INITIAL.
*           attributes
            count = nodemap->get_length( ).
            DO count TIMES.
              index  = sy-index - 1.
              attr   = nodemap->get_item( index ).
              name   = attr->get_name( ).
              prefix = attr->get_namespace_prefix( ).
              value  = attr->get_value( ).
              WRITE: / 'ATTRIBUTE:'.
              WRITE: AT indent name  COLOR COL_HEADING INVERSE, '=',
                               value COLOR COL_TOTAL   INVERSE.
            ENDDO.
          ENDIF.
        WHEN if_ixml_node=>co_node_text OR
             if_ixml_node=>co_node_cdata_section.
*         text node
          value  = node->get_value( ).
          WRITE: / 'VALUE     :'.
          WRITE: AT indent value COLOR COL_GROUP INVERSE.
      ENDCASE.
*     advance to next node
      node = iterator->get_next( ).
    ENDWHILE.
  ENDFORM.                    "process_dom
Regards,
Samson Rodrigues.