SAP Function module
用这个function module 可以下载文件到本地，实现数据的local处理。1。 首先，提两个相关的function module，涉及到参数CODEPAGE，影响文件的输出格式。
function module SCP_CODEPAGE_BY_EXTERNAL_NAME，可以转换输出文件格式，例，输入'UTF-8'，返回4110，输入'GBK',返回8400。
function module NLS_GET_FRONTEND_CP，输入语言，返回参数CODEPAGE的四位数字值，例:输入'ZH',返回1160这个四位阿拉伯数字。
平时我们所用的，只要输入这四个参数就可以使用了。
DATA : C_FULLPATH TYPE STRING.例如，CALL FUNCTION 'GUI_DOWNLOAD'EXPORTING BIN_FILESIZE = 255 FILENAME = C_FULLPATH FILETYPE = 'BIN' APPEND = ''IMPORTING FILELENGTH = ''TABLES DATA_TAB = ''.
CALL FUNCTION 'GUI_DOWNLOAD' EXPORTING BIN_FILESIZE = 255 FILENAME = C_FULLPATH FILETYPE = 'DAT' APPEND = ' ' WRITE_FIELD_SEPARATOR = 'X' HEADER = '00' TRUNC_TRAILING_BLANKS = ' ' WRITE_LF = 'X' COL_SELECT = ' ' COL_SELECT_MASK = ' ' DAT_MODE = ' ' CONFIRM_OVERWRITE = ' ' NO_AUTH_CHECK = ' ' CODEPAGE = '4103' IGNORE_CERR = ABAP_TRUE REPLACEMENT = '#' WRITE_BOM = 'X' TRUNC_TRAILING_BLANKS_EOL = 'X' WK1_N_FORMAT = ' ' WK1_N_SIZE = ' ' WK1_T_FORMAT = ' ' WK1_T_SIZE = ' ' WRITE_LF_AFTER_LAST_LINE= ABAP_TRUE SHOW_TRANSFER_STATUS = ABAP_TRUE IMPORTING FILELENGTH = TABLES DATA_TAB = IT_KNA1 FIELDNAMES = IT_FILEDNAME[] EXCEPTIONS FILE_WRITE_ERROR = 1 NO_BATCH = 2 GUI_REFUSE_FILETRANSFER = 3 INVALID_TYPE = 4 NO_AUTHORITY = 5 UNKNOWN_ERROR = 6 HEADER_NOT_ALLOWED = 7 SEPARATOR_NOT_ALLOWED = 8 FILESIZE_NOT_ALLOWED = 9 HEADER_TOO_LONG = 10 DP_ERROR_CREATE = 11 DP_ERROR_SEND = 12 DP_ERROR_WRITE = 13 UNKNOWN_DP_ERROR = 14 ACCESS_DENIED = 15 DP_OUT_OF_MEMORY = 16 DISK_FULL = 17 DP_TIMEOUT = 18 FILE_NOT_FOUND = 19 DATAPROVIDER_EXCEPTION = 20 CONTROL_FLUSH_ERROR = 21 OTHERS = 22.
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