屏幕字段的某些值，比如想根據某個值A，來限定另外一個值B的內容的時候，用到“DYNP_VALUES_READ”FUN，先取得A的內容。

在?AT?SELECTION-SCREEN?ON?VALUE-REQUEST?FOR? XXX 事件中使用。

例如：

????? PARAMETERS:?p_file?LIKE?rlgrap-filename

??????????????DEFAULT?'D:\XIAOXIE\'?OBLIGATORY.??

AT?SELECTION-SCREEN?ON?VALUE-REQUEST?FOR?p_file.

??PERFORM?f4_file_search?USING?',*.*??,*.*.'

???????????????????????????????'O'

???????????????????????????????'ChooseFile......'.

???DATA?:?lv_dyname???LIKE?d020s-prog,

?????????lv_dynumb???LIKE?d020s-dnum.

??DATA?:?s1(30).

??FIELD-SYMBOLS?<lfs>.

??CLEAR?:?gt_dynfields[],?gt_dynfields.

??GET?CURSOR?FIELD?gt_dynfields-fieldname.

??APPEND?gt_dynfields.

??CALL?FUNCTION?'DYNP_VALUES_READ'

????EXPORTING

??????dyname???????????????=?sy-repid

??????dynumb???????????????=?sy-dynnr

????TABLES

??????dynpfields???????????=?gt_dynfields

????EXCEPTIONS

??????invalid_abapworkarea?=?1

??????invalid_dynprofield??=?2

??????invalid_dynproname???=?3

??????invalid_dynpronummer?=?4

??????invalid_request??????=?5

??????no_fielddescription??=?6

??????invalid_parameter????=?7

??????undefind_error???????=?8

??????double_conversion????=?9

??????OTHERS???????????????=?10.

??IF?sy-subrc?NE?0.

????MESSAGE?ID?sy-msgid?TYPE?'S'?NUMBER?sy-msgno

????????????WITH?sy-msgv1?sy-msgv2?sy-msgv3?sy-msgv4.

??ENDIF.

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