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上载文件其实是最最常用的搜索帮助之一。

最简单的使用：F4_FILENAME

demo：

PARAMETERS:  P_FILE TYPE IBIPPARMS-PATH. 
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE.
  CALL FUNCTION 'F4_FILENAME'    IMPORTING      FILE_NAME = P_FILE.

或者：

PARAMETERS:   P_FILE TYPE IBIPPARMS-PATH.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE.  CALL FUNCTION 'WS_FILENAME_GET'    EXPORTING      TITLE            = '选择文件'    IMPORTING      FILENAME         = P_FILE    EXCEPTIONS      INV_WINSYS       = 1      NO_BATCH         = 2      SELECTION_CANCEL = 3      SELECTION_ERROR  = 4      OTHERS           = 5.  IF SY-SUBRC <> 0 AND SY-SUBRC <> 3.    MESSAGE E100(ZDEV) WITH '选择文件出错！'(007).  ENDIF.

再或者

PARAMETERS:   P_FILE TYPE IBIPPARMS-PATH.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE.
  DATA: V_RC        TYPE I,        V_FILETABLE TYPE FILETABLE.  CALL METHOD CL_GUI_FRONTEND_SERVICES=>FILE_OPEN_DIALOG    EXPORTING      WINDOW_TITLE            = '选择源文件'      FILE_FILTER             = '全部文件 (*.*)'      MULTISELECTION          = SPACE    CHANGING      FILE_TABLE              = V_FILETABLE      RC                      = V_RC    EXCEPTIONS      FILE_OPEN_DIALOG_FAILED = 1      CNTL_ERROR              = 2      ERROR_NO_GUI            = 3      NOT_SUPPORTED_BY_GUI    = 4      OTHERS                  = 5.  IF SY-SUBRC = 0 AND V_RC = 1.    READ TABLE V_FILETABLE INTO P_FILE INDEX 1.  ENDIF.

还有个下载路径：

PARAMETERS:   P_FILE TYPE IBIPPARMS-PATH.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR P_FILE.
  DATA : LC_FILENAME TYPE STRING  VALUE  '请选择文件路径',         LC_FULLPATH TYPE STRING,         LC_PATH     TYPE  STRING.
  CALL METHOD CL_GUI_FRONTEND_SERVICES=>FILE_SAVE_DIALOG    EXPORTING      DEFAULT_EXTENSION    = 'XLS'    "默认保存文件格式      DEFAULT_FILE_NAME    = LC_FILENAME   "默认文件名称    CHANGING      FILENAME             = LC_FILENAME    "默认文件名称      PATH                 = LC_PATH             "文件路径      FULLPATH             = LC_FULLPATH   "文件路径    EXCEPTIONS      CNTL_ERROR           = 1      ERROR_NO_GUI         = 2      NOT_SUPPORTED_BY_GUI = 3      OTHERS               = 4.  IF SY-SUBRC  =  0 .    P_FILE  = LC_FULLPATH .  ELSEIF SY-SUBRC <>  0 .    MESSAGE   '保存文件出错！'  TYPE  'E' .  ENDIF .

https://mp.weixin.qq.com/s/twta_XBJ8bhaaety5ynyRA