Question

我仍然是ABAP的新手，而在尝试制作ALV时我会在执行程序时收到崩溃报告。为了创建一个ALV我已经遵循了一些教程和内容，目前它看起来像这样：

TYPE-POOLS: slis. 
*build field catalog
DATA: it_fieldcat TYPE slis_t_fieldcat_alv,
    wa_fieldcat TYPE slis_fieldcat_alv,
    repid TYPE sy-repid.

REFRESH it_fieldcat.
CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Table ID'.
wa_fieldcat-fieldname    = 'table_id'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '18'.
APPEND wa_fieldcat TO it_fieldcat.

CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Table Description'.
wa_fieldcat-fieldname    = 'table_description'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '40'.
APPEND wa_fieldcat TO it_fieldcat.

CLEAR wa_fieldcat.
wa_fieldcat-reptext_ddic = 'Numer of Records Found'.
wa_fieldcat-fieldname    = 'nr_of_records'.
wa_fieldcat-tabname      = 'lt_where_used_data_of_coll'.
wa_fieldcat-outputlen    = '30'.
APPEND wa_fieldcat TO it_fieldcat.

*pass data and field catalog to ALV function module
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
  i_callback_program      = repid
  it_fieldcat             = it_fieldcat
  i_structure_name        = 'lty_where_used_data_of_coll'
TABLES
  t_outtab                = lt_where_used_data_of_coll.

＆＃39; lt_where_used_data_of_coll＆＃39;是我的本地表，我已经在我的程序早期已经填充了一个工作函数。这个功能工作，我测试了它，表填充了数据。我的下一步是将这些数据显示给最终用户。我在执行此程序时收到的错误报告是：

短文： Field symbol has not yet been assigned.

发生什么事了？：

Error in the ABAP Application Program.
    The current ABAP program "SAPLSLVC" had to be terminated because it has
    come across a statement that unfortunately cannot be executed.

错误分析：

You attempted to access an unassigned field symbol
(data segment "-1").

触发运行时错误的位置：

    Program                                 SAPLSLVC
    Include                                 LSLVCF36
    Row                                     3,273
    Module type                             (FORM)
    Module Name                             FILL_DATA_TABLE

我真的不知道如何开始发现我的错误。从ABAP本身调用函数时，它似乎运行不好。

非常感谢任何帮助。

编辑：正如我所建议的，我实现了另一种显示ALV的方法，可以在下面找到。这种方式工作正常，没有错误。问题仍然是旧方法确实给我一个错误的原因。

我用以下代码替换了上面的整个代码块：

DATA alv TYPE REF TO cl_salv_table. DATA message TYPE REF TO cx_salv_msg.

*initialize ALV
TRY.
  cl_salv_table=>factory(
    IMPORTING
      r_salv_table = alv
    CHANGING
      t_table      = lt_where_used_data_of_coll ).
CATCH cx_salv_msg INTO message.
  " error handling
ENDTRY.
*display ALV
alv->display( ).

Answer 1

为什么旧方法会给我一个错误

字段目录名称区分大小写。将每个fieldname和tabname值大写，并查看错误是否仍然存在。还要确保名称与内部表lt_where_used_data_of_coll

的名称相匹配

在ALV中使用内置SLIS功能时的短转储

1 个答案: