methods - 方法参数中的 "Inline declaration is not possible in this position"

Question

下面的代码给出了这个错误:

The inline declaration "DATA(LV_DESKTOP)" is not possible in this position.

  CALL METHOD cl_gui_frontend_services=>get_desktop_directory
    CHANGING
      desktop_directory = data(lv_desktop). "Declaring in method

Answer 1

您不能在方法调用中使用带有 CHANGING 和 EXPORTING 类型参数的内联声明。

ABAP documentation没有明确说明，但明确提到内联声明可用于类型为IMPORTING和RECEIVING的参数，但有一些限制，而没有提及其他两种类型.

进行了广泛的讨论 here和 here .

可能的带有方法调用的内联声明示例:

cl_gui_frontend_services=>FILE_GET_ATTRIBUTES
    EXPORTING
      filename = `C:\test.txt`
    IMPORTING
      readonly = DATA(readonly) ).
cl_ixml=>create(
    RECEIVING
      rval = DATA(ixml) ).

关于EXPORTING 或CHANGING，您必须处理旧声明。示例:

DATA lv_desktop TYPE string.
cl_gui_frontend_services=>get_desktop_directory(
    CHANGING
      desktop_directory = lv_desktop ).