reference - 访问返回参数的组件时出现ThisIsNotAObjectReference错误

Question

我收到 ThisIsNotAObjectReference 尝试处理完全类型化的数据引用表达式时的语法消息，如下所示:

method getDataReference.
 rr_value = ref #( varStructure ).
endmethod.

data(lr_value) = object->getDataReference( )->structureComponent.

我理解检索对象引用的语法是相同的，但是如何处理表达式中的完全类型化数据引用？

Answer 1

您不能将方法调用与引用组件访问链接起来。您应该像这样使用辅助变量:

CLASS lcl_class DEFINITION.
PUBLIC SECTION.
 METHODS: getdatareference RETURNING VALUE(rr_value) TYPE REF TO mara.
ENDCLASS.

CLASS lcl_class IMPLEMENTATION.
  METHOD getdatareference.
    DATA: ls_mara TYPE mara.
    rr_value = REF #( ls_mara ).
    SELECT SINGLE * FROM mara INTO rr_value->*.
  ENDMETHOD.
ENDCLASS.

START-OF-SELECTION.
  DATA(lcl)     = NEW lcl_class( ).
  DATA(lv_mara) = lcl->getdatareference( ).
  DATA(l_matnr) = lv_mara->matnr.