[英]Getting the fieldnames from the field-symbols
I need to get the field names in the field-symbol <itab>
, so that I can use the names for the field catalog of ALV. 我需要在字段符号
<itab>
获取字段名称,以便可以将名称用于ALV的字段目录。
So I used cl_abap_structdescr but it throws me always an error. 所以我使用了cl_abap_structdescr但它总是使我出错。 I tried this with an internal table and i had the expected result, but I have to use the field symbol instead of internal table.
我用一个内部表尝试了此操作,并且得到了预期的结果,但是我必须使用字段符号而不是内部表。
ASSIGN lo_itab->* TO <itab>
data: go_struct type ref to cl_abap_structdescr,
gt_comp type abap_component_tab,
gs_comp type abap_componentdescr.
go_struct ?= cl_abap_typedescr=>describe_by_data( <itab> ).
gt_comp = go_struct->get_components( ).
loop at gt_comp into gs_comp.
PERFORM fill_fieldcat USING :
gs_comp-name '' gs_comp-name
.
endloop.
Because <itab>
is obviously an internal table , its type is "table", not "structure"! 因为
<itab>
显然是一个内部表 ,所以它的类型是“表”,而不是“结构”! (also see the short dump, it says that describe_by_data
returned a type cl_abap_tabledescr
which is not compatible with the type of target go_struct
, ie cl_abap_structdescr
) (另请参见简短转储,它说
describe_by_data
返回的类型cl_abap_tabledescr
与目标go_struct
的类型不兼容,即cl_abap_structdescr
)
So you must first get its table type, then get the type of its lines (I assume here that it's a structured type, but it could be other types in some other situations). 因此,您必须首先获取其表类型,然后获取其行的类型(我在这里假设它是结构化类型,但在某些其他情况下也可以是其他类型)。
data: go_table type ref to cl_abap_tabledescr.
go_struct type ref to cl_abap_structdescr,
gt_comp type abap_component_tab,
gs_comp type abap_componentdescr.
go_table ?= cl_abap_typedescr=>describe_by_data( <itab> ).
go_struct ?= go_table->get_table_line_type( ).
gt_comp = go_struct->get_components( ).
...
As you are assigning reference type to another reference type therefore you getting dump. 当您将引用类型分配给另一个引用类型时,您将得到转储。 Define a structure type and pass in place of as i did in the below example.
定义结构类型并像下面的示例中那样传递。 You will not get any dump.
您将不会得到任何转储。
data: go_struct type ref to cl_abap_structdescr,
gt_comp type abap_component_tab,
gs_comp type abap_componentdescr.
DATA ls_spfli TYPE spfli.
go_struct ?= cl_abap_typedescr=>describe_by_data( ls_spfli ).
gt_comp = go_struct->get_components( ).
loop at gt_comp into gs_comp.
* PERFORM fill_fieldcat USING :
* gs_comp-name '' gs_comp-name
* .
endloop.
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